The evolution of the helium-ionizing background at z ~ 2-3 (2009)
Dixon, Keri L., Furlanetto, Steven R.
Recent observations suggest that helium became fully ionized around redshift z ~ 3. The HeII optical depth derived from the Lyman-alpha forest decreases substantially from this period to z ~ 2;...
In Situ Probes of the First Galaxies and Reionization: Gamma-ray Bursts (2009)
McQuinn, Matthew, Bloom, Joshua S., Grindlay, Jonathan, Band, David, Barthelmy, S. D., Berger, E., ...
The first structures in the Universe formed at z>7, at higher redshift than all currently known galaxies. Since GRBs are brighter than other cosmological sources at high redshift and exhibit simple...
The evolution of the Lyman-alpha forest effective optical depth following HeII reionisation (2009)
Bolton, James S., Oh, S. Peng, Furlanetto, Steven R.
Three independent observational studies have now detected a narrow (\Delta z ~ 0.5) dip centred at z=3.2 in the otherwise smooth redshift evolution of the Lya forest effective optical depth. This...
The abundance of lensing protoclusters (2008)
D'Aloisio, Anson, Furlanetto, Steven R., Natarajan, Priyamvada
Weak gravitational lensing provides a potentially powerful method for the detection of clusters. In addition to cluster candidates, a large number of objects with possibly no optical or X-ray...
Photo-heating and the fate of hard photons during the reionisation of HeII by quasars (2008)
Bolton, James S., Oh, S. Peng, Furlanetto, Steven R.
We use a combination of analytic and numerical arguments to consider the impact of quasar photo-heating during HeII reionisation on the thermal evolution of the intergalactic medium (IGM). We...
High-redshift voids in the excursion set formalism (2007)
D'Aloisio, Anson, Furlanetto, Steven R.
Voids are a dominant feature of the low-redshift galaxy distribution. Several recent surveys have found evidence for the existence of large-scale structure at high redshifts as well. We present...
21-cm fluctuations from inhomogeneous X-ray heating before reionization (2007)
Pritchard, Jonathan R., Furlanetto, Steven R.
Many models of early structure formation predict a period of heating immediately preceding reionization, when X-rays raise the gas temperature above that of the cosmic microwave background. These...
Galaxy surveys, inhomogeneous re-ionization and dark energy (2007)
Pritchard, Jonathan R., Furlanetto, Steven R., Kamionkowski, Marc
We examine the effect of inhomogeneous re-ionization on the galaxy power spectrum and the consequences for probing dark energy. To model feedback during re-ionization, we apply an ansatz setting the...
Effects of dark matter decay and annihilation on the high-redshift 21 cm background (2006)
Furlanetto, Steven R., Oh, S. Peng, Pierpaoli, Elena
The radiation background produced by the 21 cm spin-flip transition of neutral hydrogen at high redshifts can be a pristine probe of fundamental physics and cosmology. At z~30–300, the...
Measuring the Primordial Deuterium Abundance during the Cosmic Dark Ages (2006)
Sigurdson, Kris, Furlanetto, Steven R.
We discuss how measurements of fluctuations in the absorption of cosmic microwave background photons by neutral gas at redshifts z[approximate]7–200 could reveal the primordial deuterium abundance...
21 cm fluctuations from inhomogeneous X-ray heating before reionization (2006)
Pritchard, Jonathan R., Furlanetto, Steven R.
Many models of early structure formation predict a period of heating immediately preceding reionization, when X-rays raise the gas temperature above that of the cosmic microwave background. These...
Galaxy surveys, inhomogeneous reionization, and dark energy (2006)
Pritchard, Jonathan R., Furlanetto, Steven R., Kamionkowski, Marc
We examine the effect of inhomogeneous reionization on the galaxy power spectrum and the consequences for probing dark energy. To model feedback during reionization, we apply an ansatz setting the...
Simulations and Analytic Calculations of Bubble Growth During Hydrogen Reionization (2006)
Zahn, Oliver, Lidz, Adam, McQuinn, Matthew, Dutta, Suvendra, Hernquist, Lars, Zaldarriaga, Matias, ...
We present results from a large volume simulation of Hydrogen reionization. We combine 3d radiative transfer calculations and an N-body simulation, describing structure formation in the intergalactic...
Nagamine, Kentaro, Cen, Renyue, Furlanetto, Steven R., Hernquist, Lars, Night, Christopher, Ostriker, Jeremiah P.
Cosmological hydrodynamic simulations have significantly improved over the past several years, and we have already shown that the observed properties of Lyman-break galaxies (LBGs) at z=3 can be...
Have We Detected Patchy Reionization in Quasar Spectra? (2005)
Lidz, Adam, Oh, S. Peng, Furlanetto, Steven R.
The Lyman-alpha forest at z >~ 5.5 shows strong scatter in the mean transmission even when smoothed over very large spatial scales, >~ 50 Mpc/h. This has been interpreted as a signature of strongly...
Cosmological Parameter Estimation Using 21 cm Radiation from the Epoch of Reionization (2005)
McQuinn, Matthew, Zahn, Oliver, Zaldarriaga, Matias, Hernquist, Lars, Furlanetto, Steven R.
A number of radio interferometers are currently being planned or constructed to observe 21 cm emission from reionization. Not only will such measurements provide a detailed view of that epoch, but,...
Cluster Merger Variance and the Luminosity Gap Statistic (2005)
Milosavljevic, Milos, Miller, Christopher J., Furlanetto, Steven R., Cooray, Asantha
The presence of multiple luminous galaxies in clusters can be explained by the finite time over which a galaxy sinks to the center of the cluster and merges with the the central galaxy. The simplest...
Pritchard, Jonathan R., Furlanetto, Steven R.
We examine the effect of Lyman continuum photons on the 21 cm background in the high-redshift universe. The brightness temperature of this transition is determined by the spin temperature T_s, which...
Pair Correlations and Merger Bias (2005)
Furlanetto, Steven R., Kamionkowski, Marc
We study analytically the possibility that mergers of haloes are more highly clustered than the general population of haloes of comparable masses. We begin by investigating predictions for merger...
Characteristic Scales During Reionization (2005)
Furlanetto, Steven R., McQuinn, Matthew, Hernquist, Lars
One of the key observables of the reionization era is the distribution of neutral and ionized gas. Recently, Furlanetto, Zaldarriaga, & Hernquist developed a simple analytic model to describe the...
The Effects of Reionization on Lyman-alpha Galaxy Surveys (2005)
Furlanetto, Steven R., Zaldarriaga, Matias, Hernquist, Lars
Searches for Lyman-alpha emission lines are among the most effective ways to identify high-redshift galaxies. They are particularly interesting because they probe not only the galaxies themselves but...
Measuring the Primordial Deuterium Abundance During the Cosmic Dark Ages (2005)
Sigurdson, Kris, Furlanetto, Steven R.
We discuss how measurements of fluctuations in the absorption of cosmic microwave background (CMB) photons by neutral gas during the cosmic dark ages, at redshifts z ~ 7--200, could reveal the...
Taxing the Rich: Recombinations and Bubble Growth During Reionization (2005)
Furlanetto, Steven R., Oh, S. Peng
Reionization is inhomogeneous for two reasons: the clumpiness of the intergalactic medium (IGM) and clustering of the discrete ionizing sources. While numerical simulations can in principle take both...
The Kinetic Sunyaev-Zel'dovich Effect from Reionization (2005)
McQuinn, Matthew, Furlanetto, Steven R., Hernquist, Lars, Zahn, Oliver, Zaldarriaga, Matias
During the epoch of reionization, local variations in the ionized fraction (patchiness) imprint arcminute-scale temperature anisotropies in the CMB through the kinetic Sunyaev-Zel'dovich (kSZ)...
Lyα emission from structure formation (2005)
Furlanetto, Steven R., Schaye, Joop, Springel, Volker, Hernquist, Lars
Oh, S. Peng, Furlanetto, Steven R.
Detectable flux is visible in the Ly-alpha and Ly-beta troughs of the highest redshift ($z=6.42$) quasar found to date, SDSS J1148+5251. This has previously been interpreted as continuum...