Kramer, Roban Hultman, Haiman, Zoltan
Arguably the best hope of understanding the tail end of the reionization of the intergalactic medium (IGM) at redshift z > 6 is through the detection and characterization of the Gunn-Peterson (GP)...
Shang, Cien, Haiman, Zoltan, Verde, Licia
Scaling relations among galaxy cluster observables, which will become available in large future samples of galaxy clusters, could be used to constrain not only cluster structure, but also cosmology....
Shang, Cien, Bryan, Greg, Haiman, Zoltan
In the absence of H_2 molecules, the primordial gas in early dark matter halos with virial temperatures just above T_vir >~ 10^4 K cools by collisional excitation of atomic H. Although it cools...
Cosmology from the Highly-Redshifted 21 cm Line (2009)
Furlanetto, Steven, Lidz, Adam, Loeb, Abraham, McQuinn, Matthew, Pritchard, Jonathan, Shapiro, Paul, ...
One of the next decade's most exciting prospects is to explore the cosmic "dark ages," during which the first stars in the Universe formed, with the 21 cm line of neutral hydrogen. At z>6, this light...
Astrophysics from the Highly-Redshifted 21 cm Line (2009)
Furlanetto, Steven, Lidz, Adam, Loeb, Abraham, McQuinn, Matthew, Pritchard, Jonathan, Aguirre, James, ...
The cosmic dark ages and the epoch of reionization, during which the first generations of stars and galaxies formed, are among the most compelling frontiers of extragalactic astrophysics and...
Cooray, Asantha, Amblard, Alexandre, Beichman, Charles, Benford, Dominic, Bernstein, Rebecca, Bock, James, ...
(Brief Summary) What is the total radiative content of the Universe since the epoch of recombination? The extragalactic background light (EBL) spectrum captures the redshifted energy released from...
Bloom, Joshua S., Holz, Daniel E., Hughes, Scott A., Menou, Kristen, Adams, Allan, Anderson, Scott F., ...
It is widely expected that the coming decade will witness the first direct detection of gravitational waves (GWs). The ground-based LIGO and Virgo GW observatories are being upgraded to advanced...
Radiative Feedback in Relic HII Regions at High-Redshift (2008)
Mesinger, Andrei, Bryan, Greg L., Haiman, Zoltan
UV radiation from early astrophysical sources could have a large impact on subsequent star formation in nearby protogalaxies. Here we study the radiative feedback from the first, short-lived stars...
Dark Energy Observables Making Light of the Dark Side (2008)
Wayne Hu, Christopher Gordon, Zoltan Haiman, Bhuvnesh Jain, Marcos Lima, Ryan Scranton, ...
• Dark matter simulations approaching the accuracy of CMB calculations
Dijkstra, Mark, Haiman, Zoltan, Mesinger, Andrei, Wyithe, Stuart
The earliest generation of stars and black holes must have established an early 'Lyman-Werner' background (LWB) at high redshift, prior to the epoch of reionization. Because of the long mean free...
Observing the First Stars and Black Holes (2008)
The high sensitivity of JWST will open a new window on the end of the cosmological dark ages. Small stellar clusters, with a stellar mass of several 10^6 M_sun, and low-mass black holes (BHs), with a...
Challenges to the DGP Model from Horizon-Scale Growth and Geometry (2008)
Fang, Wenjuan, Wang, Sheng, Hu, Wayne, Haiman, Zoltan, Hui, Lam, May, Morgan
We conduct a Markov Chain Monte Carlo study of the Dvali-Gabadadze-Porrati (DGP) self-accelerating braneworld scenario given the cosmic microwave background (CMB) anisotropy, supernovae and Hubble...
Shankar, Francesco, Bernardi, Mariangela, Haiman, Zoltan
We utilize the local velocity dispersion function (VDF) of spheroids, together with their inferred age--distributions, to predict the VDF at higher redshifts (0
Cosmological Physics with Black Holes (and Possibly White Dwarfs) (2008)
Menou, Kristen, Haiman, Zoltan, Kocsis, Bence
The notion that microparsec-scale black holes can be used to probe gigaparsec-scale physics may seem counterintuitive, at first. Yet, the gravitational observatory LISA will detect...
Fossil Ionized Bubbles Around Dead Quasars During Reionization (2008)
Furlanetto, Steven, Haiman, Zoltan, Oh, S. Peng
One of the most dramatic signatures of the reionization era may be the enormous ionized bubbles around luminous quasars (with radii reaching ~40 comoving Mpc), which may survive as "fossil'' ionized...
Restricted Access. An open-access version is available at arXiv.org. The article will be made open-access at the journal site (alternative location) after 24 months.
Prompt Shocks in the Gas Disk Around a Recoiling Supermassive Black Hole Binary (2008)
Lippai, Zoltan, Frei, Zsolt, Haiman, Zoltan
Supermassive black hole binaries (BHBs) produced in galaxy mergers recoil at the time of their coalescence due to the emission of gravitational waves (GWs). We simulate the response of a thin, 2D...
Kocsis, Bence, Haiman, Zoltan, Menou, Kristen
Electromagnetic (EM) counterparts to supermassive black hole binary mergers observed by LISA can be localized to within the field of view of astronomical instruments ~10 deg^2 hours to weeks prior to...
Formation and Signatures of the First Stars and Quasars (2007)
Zoltan Haiman, An Haiman, Abraham Loeb
. We examine various observable signatures of the first generation of stars and low-- luminosity quasars, including the metal enrichment, radiation background, and dust opacity/emission that they...
Signatures of the First Stars in the Universe (2007)
. We calculate the observable signatures of the first generation of stars at high redshifts (5 ! z ! 10 3 ). We determine the cosmic star--formation history, using an extension of the...
An Evolving Entropy Floor in the Intracluster Gas? (2007)
Non-gravitational processes, such as feedback from galaxies and their active nuclei, are believed to have injected excess entropy into the intracluster gas, and therefore to have modified the density...
Hernandez-Monteagudo, Carlos, Haiman, Zoltan, Verde, Licia, Jimenez, Raul
At the epoch of reionization, when the high-redshift inter-galactic medium (IGM) is being enriched with metals, the 63.2 micron fine structure line of OI is pumped by the ~ 1300 AA soft UV background...
Wang, Sheng, Hui, Lam, May, Morgan, Haiman, Zoltan
We apply the technique of parameter-splitting to existing cosmological data sets, to check for a generic failure of dark energy models. Given a dark energy parameter, such as the energy density...
On constraining a transiting exoplanet's rotation rate with its transit spectrum (2007)
Spiegel, David S., Haiman, Zoltan, Gaudi, B. Scott
We investigate the effect of planetary rotation on the transit spectrum of an extrasolar giant planet. During ingress and egress, absorption features arising from the planet's atmosphere are Doppler...
The ages metallicities, and star formation histories of early-type galaxies in the SDSS (2007)
Jimenez, Raul, Bernardi, Mariangela, Haiman, Zoltan, Panter, Ben, Heavens, Alan F.
Oxygen Pumping: Mapping the Reionization Epoch with the CMB (2006)
Hernandez-Monteagudo, Carlos, Haiman, Zoltan, Jimenez, Raul, Verde, Licia
We consider the pumping of the $63.2 \mu$m fine structure line of neutral OI in the high--redshift intergalactic medium (IGM), in analogy with the Wouthuysen--Field effect for the 21cm line of cosmic...
We study the potential of a large future weak-lensing survey to constrain dark energy properties by using both the number counts of detected galaxy clusters (sensitive primarily to density...
Luminosity Functions of Lyman Alpha Emitting Galaxies and Cosmic Reionization of Hydrogen (2006)
Dijkstra, Mark, Wyithe, Stuart, Haiman, Zoltan
Recent observations imply that the observed number counts of Lya Emitters (LAEs) evolved significantly between z=5.7 and z=6.5. It has been suggested that this was due to a rapid evolution in the...
The ages, metallicities and star formation histories of early-type galaxies in SDSS (2006)
Jimenez, Raul, Bernardi, Mariangela, Haiman, Zoltan, Panter, Ben, Heavens, Alan F.
We use the spectra of ~ 22,000 early-type galaxies, selected from the Sloan Digital Sky Survey, to infer the ages, metallicities and star formation histories of these galaxies. We find clear evidence...
Haiman, Zoltan, Jimenez, Raul, Bernardi, Mariangela
We use the spectra of 22,000 nearby early-type galaxies from the Sloan Digital Sky Survey (SDSS) to determine the age distribution of these galaxies as a function of their velocity dispersion sigma_v...
Mesinger, Andrei, Haiman, Zoltan
We make use of hydrodynamical simulations of the intergalactic medium (IGM) to create model quasar absorption spectra. We compare these model spectra with the observed Keck spectra of three z>6.2...
A Linear Perturbation Theory of Inhomogeneous Reionization (2006)
Zhang, Jun, Hui, Lam, Haiman, Zoltan
We develop an analytic approach to study inhomogeneous reionization on large scales by solving the equations of ionization balance and radiative transfer to first order in perturbations. Given the...
Younger, Joshua D., Haiman, Zoltan, Bryan, Greg L., Wang, Sheng
Forthcoming large galaxy cluster surveys will yield tight constraints on cosmological models. It has been shown that in an idealized survey, containing > 10,000 clusters, statistical errors on dark...
Feedback from Clustered Sources During Reionization (2006)
Kramer, Roban Hultman, Haiman, Zoltan, Oh, S. Peng
The reionization history of the intergalactic medium (IGM) at high redshift (z > 6) was likely strongly shaped by several global feedback processes. Because the earliest ionizing sources formed at...
UV Radiative Feedback on High-Redshift Proto-Galaxies (2006)
Mesinger, Andrei, Bryan, Greg, Haiman, Zoltan
We use three-dimensional hydrodynamic simulations to investigate the effects of a transient photoionizing ultraviolet (UV) flux on the collapse and cooling of pregalactic clouds. These clouds have...
Was Star-Formation Suppressed in High-Redshift Minihalos? (2006)
Haiman, Zoltan, Bryan, Greg L.
The primordial gas in the earliest dark matter halos, collapsing at redshifts around z=20, with masses M_halo=10^6 M_sun, and virial temperatures T_vir 10^4K). This conclusion is insensitive to...
Significant primordial star formation at redshifts z ~ 3-4 (2006)
Four recent observational results have challenged our understanding of high--redshift galaxies, as they require the presence of far more ultraviolet photons than should be emitted by normal stellar...
High Shear Regions in Weak Lensing Surveys Determine Cosmology (2005)
Wang, Sheng, Haiman, Zoltan, May, Morgan, Kehayias, John
We propose to use a simple observable, the fractional area of "hot spots" in weak lensing mass maps which are detected with high significance, to determine background cosmological parameters. Because...
Dijkstra, Mark, Haiman, Zoltan, Spaans, Marco
We present Monte Carlo calculations of Lyman alpha (Lya) radiative transfer through collapsing gas clouds, representing proto-galaxies that are caught in the process of their assembly. Such galaxies...
Lyman Alpha Radiation From Collapsing Protogalaxies II: Observational Evidence for Gas Infall (2005)
Dijkstra, Mark, Haiman, Zoltan, Spaans, Marco
We model the spectra and surface brightness distributions for the Lyman alpha (Lya) radiation expected from protogalaxies that are caught in the early stages of their assembly. We use the results of...
A Snapshot Survey for Gravitational Lenses Among z>=4.0 Quasars: II. Constraints on the 4.0 (2005)
Richards, Gordon T., Haiman, Zoltan, Pindor, Bartosz, Strauss, Michael A., Fan, Xiaohui, Eisenstein, Daniel, ...
We report on i-band snapshot observations of 157 Sloan Digital Sky Survey (SDSS) quasars at 4-4.63 obtained from the absence of lensing in four z>5.7 quasars. Such constraints are important for our...
Weighing Neutrinos with Galaxy Cluster Surveys (2005)
Wang, Sheng, Haiman, Zoltan, Hu, Wayne, Khoury, Justin, May, Morgan
Large future galaxy cluster surveys, combined with cosmic microwave background observations, can achieve a high sensitivity to the masses of cosmologically important neutrinos. We show that a weak...
The Redshift Distribution of Distant Supernovae and its Use in Probing Reionization (2005)
Mesinger, Andrei, Johnson, Benjamin D., Haiman, Zoltan
We model the number of detectable supernovae (SNe) as a function of redshift at different flux thresholds, making use of the observed properties of local SNe, such as their lightcurves, fiducial...
Mesinger, Andrei, Perna, Rosalba, Haiman, Zoltan
Cosmological models that include suppression of the power spectrum of density fluctuations on small scales exhibit an exponential reduction of high-redshift, non-linear structures, including a...
Spiegel, David S., Zamojski, Michel, Gersch, Alan, Donovan, Jennifer, Haiman, Zoltan
We revisit the possibility of detecting an extrasolar planet around a background star as it crosses the fold caustic of a foreground binary lens. During such an event, the planet's flux can be...
At redshifts beyond z>6, as the mean fraction of neutral hydrogen x_HI in the intergalactic medium (IGM) increases, the line flux of Lyman alpha (Lya) emitters can be significantly suppressed, which...
On Detecting the X-ray Silhouette of a Damped Lyman alpha System (2004)
Dijkstra, Mark, Haiman, Zoltan, Scharf, Caleb
We explore the possibility of resolving an image of a damped Lyman alpha (DLA) system in absorption against an extended, diffuse background X-ray source. Typical columns of neutral hydrogen in DLAs...
Kocsis, Bence, Haiman, Zoltan, Frei, Zsolt
In cosmological structure formation models, massive non-linear objects in the process of formation, such as galaxy clusters, are surrounded by large-scale shocks at or around the expected virial...
The Growth of the Earliest Supermassive Black Holes and Their Contribution to Reionization (2004)
Haiman, Zoltan, Dijkstra, Mark, Mesinger, Andrei
We discuss currently available observational constraints on the reionization history of the intergalactic medium (IGM), and the extent to which accreting black holes (BHs) can help explain these...
Which came first, the stars and gas that make up a galaxy, or the giant black hole at its centre? Observations of a distant galaxy, caught as it forms, could help solve this chicken-and-egg problem.
A Redshift z=5.4 Lyman alpha Emitting Galaxy with Linear Morphology in the GRAPES/UDF Field (2004)
Rhoads, James E., Panagia, Nino, Windhorst, Rogier A., Malhotra, Sangeeta, Pirzkal, Norbert, Xu, Chun, ...
We have discovered an extended Lyman alpha plume associated with a compact source at redshift 5.4 in slitless spectroscopic data from the Grism ACS Program for Extragalactic Science (GRAPES) project....
Constraining the Evolution of Dark Energy with a Combination of Galaxy Cluster Observables (2004)
Wang, Sheng, Khoury, Justin, Haiman, Zoltan, May, Morgan
We show that the abundance and redshift distribution ($dN/dz$) of galaxy clusters in future high--yield cluster surveys, combined with the spatial power spectrum ($P_c(k)$) of the same clusters, can...
Mesinger, Andrei, Haiman, Zoltan
A bright quasar residing in a dense and largely neutral intergalactic medium (IGM) at high redshifts (z > 6) will be surrounded by a large cosmological Stromgren sphere. The quasar's spectrum will...
On The Dark Side of Quasar Evolution (2004)
Menou, Kristen, Haiman, Zoltan
Recent improved determinations of the mass density rho_BH of supermassive black holes (SMBHs) in the local universe have allowed accurate comparisons of rho_BH with the amount of light received from...
The Mass Budget of Merging Quasars (2004)
Menou, Kristen, Haiman, Zoltan
Two spectacular results emerging from recent studies of nearby dead quasars and distant active quasars are (i) the existence of tight relations between the masses of black holes (BHs) and the...
Gravitational lensing magnification without multiple imaging (2004)
Keeton, Charles R., Kuhlen, Michael, Haiman, Zoltan
Gravitational lensing can amplify the apparent brightness of distant sources. Images that are highly magnified are often part of multiply-imaged systems, but we consider the possibility of having...
Savin, Daniel Wolf, Krstic, Predrag S., Haiman, Zoltan, Stancil, Phillip C.
Krstic has carried out the first quantum mechanical calculations near threshold for the charge transfer (CT) process H^+ + H_2(X ^1Sigma_g^+, nu=0, J=0) --> H(1s) + H_2^+. These results are relevant...
Recent studies have shown that during their coalescence, binary supermassive black holes (SMBHs) experience a gravitational recoil with velocities of 100 km/s < v(kick) < 600 km/s. These velocities...
Implications of the Lyman alpha Emission Line from a Candidate z=10 Galaxy (2004)
Cen, Renyue, Haiman, Zoltan, Mesinger, Andrei
The recently discovered z=10 galaxy (Pello et al 2004) has a strong Lyman alpha emission line that is consistent with being surprisingly symmetric, even given the relatively poor quality of its...
The Formation and Evolution of the First Massive Black Holes (2004)
Haiman, Zoltan, Quataert, Eliot
The first massive astrophysical black holes likely formed at high redshifts (z>10) at the centers of low mass (~10^6 Msun) dark matter concentrations. These black holes grow by mergers and gas...
A Limit from the X-ray Background on the Contribution of Quasars to Reionization (2004)
Dijkstra, Mark, Haiman, Zoltan, Loeb, Abraham
A population of black holes (BHs) at high redshifts (z>6) that contributes significantly to the ionization of the intergalactic medium (IGM) would be accompanied by the copious production of hard...
Haiman, Zoltan, Quataert, Eliot, Bower, Geoffrey C.
We use a physically motivated semi-analytic model, based on the mass function of dark matter halos, to predict the number of radio-loud quasars as a function of redshift and luminosity. Simple models...
Probing the Reionization History Using the Spectra of High-Redshift Sources (2004)
Mesinger, Andrei, Haiman, Zoltan, Cen, Renyue
We quantify and discuss the footprints of neutral hydrogen in the intergalactic medium (IGM) on the spectra of high-redshift (z ~ 6) sources, using mock spectra generated from hydrodynamical...
Microlensing of Elliptical Sources by Fold Caustics (2004)
Gaudi, B. Scott, Haiman, Zoltan
We consider microlensing of an elliptical source crossing a fold caustic. We derive a simple expression for the light curve of a source with uniform surface brightness that is accurate to third order...
DUO - the Dark Universe Observatory (2004)
Griffiths, Richard, Petre, Robert, Hasinger, Günther, Predehl, Peter, White, Nicholas E., Aschenbach, Bernd, ...
A Snapshot Survey for Gravitational Lenses Among z>=4.0 Quasars: I. The z>5.7 Sample (2003)
Richards, Gordon T., Strauss, Michael A., Pindor, Bartosz, Haiman, Zoltan, Fan, Xiaohui, Eisenstein, Daniel, ...
Over the last few years, the Sloan Digital Sky Survey (SDSS) has discovered several hundred quasars with redshift between 4.0 and 6.4. Including the effects of magnification bias, one expects a...
Photoionization Feedback in Low--Mass Galaxies at High Redshift (2003)
Dijkstra, Mark, Haiman, Zoltan, Rees, Martin J., Weinberg, David H.
The cosmic ultraviolet (UV) ionizing background impacts the formation of dwarf galaxies in the low-redshift universe (z=3) by suppressing gas infall into galactic halos with circular velocities up to...
Fossil HII Regions: Self-Limiting Star Formation at High Redshift (2003)
Recent results by the WMAP satellite suggest that the intergalactic medium was significantly reionized at redshifts as high as z~17. At this early epoch, the first ionizing sources likely appeared in...
Redshifting Rings of Power (2003)
The cosmic microwave background (CMB) has provided a precise template for features in the linear power spectrum: the matter-radiation turnover, sound horizon drop, and acoustic oscillations. In a two...
Hansen, Steen H., Haiman, Zoltan
A remarkable result of the Wilkinson Microwave Anisotropy Probe (WMAP) observations is that the universe was significantly reionized at large redshifts. The standard explanation is that massive stars...
Haiman, Zoltan, Ciotti, Luca, Ostriker, Jeremiah P.
We discuss a simple model for the growth of supermassive black holes (BHs) at the center of spheroidal stellar systems. In particular, we assess the hypotheses that (1) star formation in spheroids...
The First Nonlinear Structures and the Reionization History of the Universe (2003)
In cosmological models favored by current observations, the first astrophysical objects formed in dark matter halos at redshifts starting at z>20, and their properties were determined by primordial...
The Thermal Memory of Reionization History (2003)
The recent measurement by WMAP of a large electron scattering optical depth tau_e = 0.17 +- 0.04 is consistent with a simple model of reionization in which the intergalactic medium (IGM) is ionized...
Haiman, Zoltan, Holder, Gilbert P.
The recent discovery of a high optical depth tau to Thomson scattering from the WMAP data implies that significant reionization took place at redshifts z~15. This discovery has important implications...
Holder, Gilbert, Haiman, Zoltan, Kaplinghat, Manoj, Knox, Lloyd
In light of the recent inference of a high optical depth to Thomson scattering, tau, from the WMAP data we investigate the effects of extended periods of partial ionization and ask if the value of...
Fan, Xiaohui, Strauss, Michael A., Schneider, Donald P., Becker, Robert H., White, Richard L., Haiman, Zoltan, ...
We present the discovery of three new quasars at z>6 in 1300 deg^2 of SDSS imaging data, J114816.64+525150.3 (z=6.43), J104845.05+463718.3 (z=6.23) and J163033.90+401209.6 (z=6.05). The first two...
Studying Dark Energy with Galaxy Cluster Surveys (2002)
Mohr, Joseph J., OShea, Brian, Evrard, August E., Bialek, John, Haiman, Zoltan
Galaxy cluster surveys provide a powerful means of studying the density and nature of the dark energy. The redshift distribution of detected clusters in a deep, large solid angle SZE or X-ray survey...
Constraining the Redshift z=6 Quasar Luminosity Function Using Gravitational Lensing (2002)
Comerford, Julia M., Haiman, Zoltan, Schaye, Joop
Recent discoveries by the Sloan Digital Sky Survey (SDSS) of four bright redshift z=6 quasars could constrain the mechanism by which the supermassive black holes powering these sources are assembled....
For a source of Ly alpha radiation embedded in a neutral intergalactic medium (IGM) prior to the reionization epoch, the emission line is strongly suppressed by the intervening IGM. The damping wing...
The recent discovery of bright quasars around redshift z=6 suggests that black holes (BHs) with masses in excess of 10^9 Msun have already assembled at a very early stage in the evolution of the...
The Assembly of the First Galaxies (2002)
The first galaxies formed at high redshifts, and were likely substantially less massive than typical galaxies in the local universe. We argue that (1) the reionization of a clumpy intergalactic...
Sloan Digital Sky Survey: Early data release (2002)
Stoughton, Chirs, Lupton, Rpbert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott, Castander, Francsico J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of 10 6 galaxies, 100,000...
Unusual Broad Absorption Line Quasars from the Sloan Digital Sky Survey (2002)
Hall, Patrick B., Anderson, Scott F., Strauss, Michael A., York, Donald G., Richards, Gordon T., Fan, Xiaohui, ...
Sloan Digital Sky Survey: early data release (2002)
Stoughton, Chris, Lupton, Robert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott M., Castander, Francisco J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of ≈ 106 galaxies,...
Sloan Digital Sky Survey: early data release (2002)
Stoughton, Chris, Lupton, Robert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott M., Castander, Francisco J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of ≈ 106 galaxies,...
Ciotti, Luca, Haiman, Zoltan, Ostriker, Jeremiah P.
We present a robust method to derive the duty cycle of QSO activity based on the empirical QSO luminosity function and on the present-day linear relation between the masses of supermassive black...
Predictions for the Counts of Faint, High-Redshift Galaxies in the Mid-Infrared (2001)
Haiman, Zoltan, Spergel, David N., Turner, Edwin L.
Deep mid-infrared (MIR) observations could reveal a population of faint, high-redshift (z>3) dusty starburst galaxies that are the progenitors of present-day spheroids or bulges, and are beyond the...
The first generation of protogalaxies likely formed out of primordial gas via H2-cooling in cosmological minihalos with virial temperatures of a few 1000K. However, their abundance is likely to have...
Fan, Xiaohui, Narayanan, Vijay K., Lupton, Robert H., Strauss, Michael A., Knapp, Gillian R., Becker, Robert H., ...
We present the results from a survey of i-dropout objects selected from ~1550 deg^2 of multicolor imaging data from the Sloan Digital Sky Survey, to search for luminous quasars at z>5.8. Objects with...
Verde, Licia, Haiman, Zoltan, Spergel, David N.
An extensive sample of galaxy clusters will be available in the coming years, detected through their Sunyaev-Zeldovich effect (SZE). We use a semi-analytic model to study the scientific yield of...
Constraints on Omega_m, Omega_L, and Sigma_8, from Galaxy Cluster Redshift Distributions (2001)
Holder, Gilbert, Haiman, Zoltan, Mohr, Joseph
We show that the counts of galaxy clusters in future deep cluster surveys can place strong constraints on the matter density, Omega_m, the vacuum energy density, Omega_L, and the normalization of the...
The Cosmic Baryon Fraction and the Extragalactic Ionizing Background (2001)
Hui, Lam, Haiman, Zoltan, Zaldarriaga, Matias, Alexander, Tal
We reassess constraints on the cosmological baryon density from observations of the mean decrement and power spectrum of the Lyman-alpha forest, taking into account uncertainties in all free...
Clusters in the Precision Cosmology Era (2001)
Haiman, Zoltan, Mohr, Joseph J., Holder, Gilbert P.
Over the coming decade, the observational samples available for studies of cluster abundance evolution will increase from tens to hundreds, or possibly to thousands, of clusters. Here we assess the...
Warm Dark Matter, Small Scale Crisis, and the High Redshift Universe (2001)
Haiman, Zoltan, Barkana, Rennan, Ostriker, Jeremiah P.
Warm Dark Matter (WDM) models have recently been resurrected to resolve apparent conflicts of Cold Dark Matter (DM) models with observations. Endowing the DM particles with non-negligible velocities...
Constraints on Warm Dark Matter from Cosmological Reionization (2001)
Barkana, Rennan, Haiman, Zoltan, Ostriker, Jeremiah P.
We study the constraints that high-redshift structure formation in the universe places on warm dark matter (WDM) dominated cosmological models. We modify the extended Press-Schechter formalism to...
The Merger History of Supermassive Black Holes in Galaxies (2001)
Menou, Kristen, Haiman, Zoltan, Narayanan, Vijay K.
The ubiquity of supermassive black holes (SMBHs) at the centers of nearby luminous galaxies can arise from the multiple mergers experienced by dark matter halos in hierarchical structure formation...
Extended Lyman Alpha Emission Around Young Quasars: a Constraint on Galaxy Formation (2001)
Haiman, Zoltan, Rees, Martin J.
The early stage in the formation of a galaxy inevitably involves a spatially extended distribution of infalling, cold gas. If a central luminous quasar turned on during this phase, it would result in...
What is the Highest Plausible Redshift of Luminous Quasars? (2000)
The recent discoveries of luminous quasars at high redshifts imply that black holes more massive than a few billion solar masses have been assembled already when the universe was less than a billion...
Photon Consumption in Minihalos during Cosmological Reionization (2000)
Haiman, Zoltan, Abel, Tom, Madau, Piero
At the earliest epochs of structure formation in cold dark matter (CDM) cosmologies, the smallest nonlinear objects are the numerous small halos that condense with virial temperatures below 10,000 K....
HeII Recombination Lines From the First Luminous Objects (2000)
Oh, S. Peng, Haiman, Zoltan, Rees, Martin J.
The hardness of the ionizing continuum from the first sources of UV radiation plays a crucial role in the reionization of the intergalactic medium (IGM). While usual stellar populations have soft...
Quasar Str\"omgren Spheres Before Cosmological Reionization (2000)
Ionizing sources embedded in the neutral intergalactic medium (IGM) before cosmological reionization generate discrete HII regions. We show that a sufficiently bright quasar (for example, one tenth...
Galaxy Cluster Baryon Fractions, Cluster Surveys and Cosmology (2000)
Mohr, Joseph J., Haiman, Zoltan, Holder, Gilbert P.
The properties of nearby galaxy clusters limit the range of cosmological parameters consistent with our universe. We describe the limits which arise from studies of the intracluster medium (ICM) mass...
Lyman Alpha Cooling Radiation from High-Redshift Halos (2000)
Haiman, Zoltan, Spaans, Marco, Quataert, Eliot
The baryons inside high-redshift halos with virial temperatures above T=10^4 K cool radiatively as they condense inside dark matter potential wells. We show that the release of the gravitational...
Constraints on Cosmological Parameters from Future Galaxy Cluster Surveys (2000)
Haiman, Zoltan, Mohr, Joseph J., Holder, Gilbert P.
We study the expected redshift evolution of galaxy cluster abundance between 0 < z < 3 in different cosmologies, including the effects of the cosmic equation of state parameter w=p/rho. Using the...
Constraining the Lifetime of Quasars from their Spatial Clustering (2000)
The lifetime t_Q of the luminous phase of quasars is constrained by current observations to be between 10^6 and 10^8 years, but is otherwise unkown. We model the quasar luminosity function in detail...
The Role of H2 Molecules in Cosmological Structure Formation (2000)
We review the relevance of H2 molecules for structure formation in cosmology. Molecules are important at high redshifts, when the first collapsed structures appear with typical temperatures of a few...
Probing the Cosmic Dark Age in X-rays (2000)
Empirical studies of the first generation of stars and quasars will likely become feasible within the next decade in several different wavelength bands. Microwave anisotropy experiments, such as MAP...
Aguirre, Anthony, Haiman, Zoltan
Recent observations of Type Ia SNe at redshifts 0 < z 0.1 micron dust grains with a mass density of Omega_dust ~ (few) * 10^{-5} in the intergalactic (IG) medium. The same dust that dims the SNe...
Correlations in the Far Infrared Background (1999)
We compute the expected angular power spectrum of the cosmic Far Infrared Background (FIRB). We find that the signal due to source correlations dominates the shot--noise for $\ell \la 1000$ and...
X-Ray Emission from the First Quasars (1999)
It is currently unknown whether the Universe was reionized by quasars or stars at z>5. We point out that quasars can be best distinguished from stellar systems by their X-ray emission. Based on a...
The Radiative Feedback of the First Cosmological Objects (1999)
Haiman, Zoltan, Abel, Tom, Rees, Martin J.
In hierarchical models of structure formation, an early cosmic UV background (UVB) is produced by the small (T_vir < 10^4 K) halos that collapse before reionization. The UVB at energies below 13.6eV...
Reionization of the Intergalactic Medium and its Effect on the CMB (1999)
The bulk of the hydrogen in the universe transformed from neutral to ionized somewhere in the redshift interval 5 < z < 40, most likely due to ionizing photons produced by an early generation of...
Empirical Constraints on the First Stars and Quasars (1998)
Empirical studies of the first generation of stars and quasars in the Universe will likely become feasible over the next decade. The Next Generation Space Telescope will provide direct imaging and...
Models for High-Redshift Lyman Alpha Emitters (1998)
We present models for dusty high-redshift Lyman alpha emitting galaxies by combining the Press-Schechter formalism with a treatment of inhomogeneous dust distribution inside galaxies. These models...
On the Cosmological Evolution of the Luminosity Function and the Accretion Rate of Quasars (1998)
Haiman, Zoltan, Menou, Kristen
We consider a class of models for the redshift evolution (between $0\lsim z \lsim 4$) of the observed optical and X-ray quasar luminosity functions (LFs), with the following assumptions: (i) the...
Formation of the First Stars and Quasars (1998)
We review observable signatures of the first generation of stars and low-luminosity quasars, including the metal enrichment, radiation background, and dust opacity/emission that they produce. We...
Models for Dusty Lyman alpha Emitters at High Redshift (1998)
Models are presented for the Lyman alpha emission of dusty high-redshift galaxies by combining the Press-Schechter formalism with a treatment of the inhomogeneous dust distribution inside galaxies....
Determining the Redshift of Reionization From the Spectra of High-Redshift Sources (1998)
The redshift at which the universe was reionized is currently unknown. We examine the optimal strategy for extracting this redshift, z_{reion}, from the spectra of early sources. For a source located...
Constraints from the Hubble Deep Field on High Redshift Quasar Models (1998)
Haiman, Zoltan, Madau, Piero, Loeb, Abraham
High resolution, deep imaging surveys are instrumental in setting constraints on semi-analytical structure formation models in Cold Dark Matter (CDM) cosmologies. We show here that the lack of...
Formation and signatures of the first stars and quasars. (1998)
Thesis--Harvard University, Cambridge.
Observational Signatures of the First Quasars (1997)
We study the observational signatures of a potential population of low-luminosity quasars at high redshifts in a LambdaCDM cosmology. We derive the evolution of the quasar luminosity function at...
Detection of the First Star Clusters With NGST (1997)
We calculate the observable signatures of the first generation of stars at high redshift (5
Signatures of Intergalactic Dust From the First Supernovae (1997)
We quantify the consequences of intergalactic dust produced by the first Type II supernovae in the universe. The fraction of gas converted into stars is calibrated based on the observed C/H ratio in...
Formation and Signatures of the First Stars (1997)
We use a spherical hydrodynamics code to show that in cold dark matter cosmologies, the first stars form at z=50 through the direct collapse of gas in low-mass systems (approx 10^4 solar masses)....
Signatures of Stellar Reionization of the Universe (1996)
The high ionization level and universal metallicity (1% solar) of the intergalactic gas at redshifts z10 and damps the amplitude of anisotropies on angular scales 5. The cumulative Bremsstrahlung...
Destruction of Molecular Hydrogen During Cosmological Reionization (1996)
Haiman, Zoltan, Rees, Martin, Loeb, Abraham
We investigate the ability of primordial gas clouds to retain molecular hydrogen (H_2) during the initial phase of the reionization epoch. We find that before the Stromgren spheres of the individual...
H_2 Cooling of Primordial Gas Triggered by UV Irradiation (1995)
Haiman, Zoltan, Rees, Martin, Loeb, Abraham
We investigate the formation of molecular hydrogen (H_2) in a primordial H+He gas cloud irradiated by a power-law UV flux. We find that at high densities (>1 cm^{-3}) and low temperatures (
Cosmological Formation of Low-Mass Objects (1995)
Haiman, Zoltan, Thoul, Anne A., Loeb, Abraham
We investigate the early formation of bound objects with masses comparable to the cosmological Jeans mass (10^5 solar masses). We follow the growth of isolated spherically symmetric density peaks...