Dark Matter Annihilation Rates with Velocity-Dependent Annihilation Cross Sections (2009)
Robertson, Brant, Zentner, Andrew
The detection of byproducts from particle annihilations in galactic halos would provide important information about the nature of the dark matter. Observational evidence for a local excess of...
Hopkins, Philip F., Somerville, Rachel S., Cox, Thomas J., Hernquist, Lars, Jogee, Shardha, Keres, Dusan, ...
Transformation of disks into spheroids via mergers is a well-accepted element of galaxy formation models. However, recent simulations have shown that bulge formation is suppressed in increasingly...
Collapse Barriers and Halo Abundance: Testing the Excursion Set Ansatz (2008)
Robertson, Brant, Kravtsov, Andrey, Tinker, Jeremy, Zentner, Andrew
Our heuristic understanding of the abundance of dark matter halos centers around the concept of a density threshold, or "barrier", for gravitational collapse. If one adopts the ansatz that regions of...
The Binarity of the Magellanic Clouds and the Formation of the Magellanic Stream (2008)
Besla, Gurtina, Kallivayalil, Nitya, Hernquist, Lars, Van Der Marel, Roeland P., Cox, T. J., Robertson, Brant, ...
The HST proper motion (PM) measurements of the Clouds have severe implications for their interaction history with the Milky Way (MW) and with each other. The Clouds are likely on their first passage...
On the Origin of Dynamically Cold Rings Around the Milky Way (2008)
Younger, Joshua D., Besla, Gurtina, Cox, T. J., Hernquist, Lars, Robertson, Brant, Willman, Beth
We present a scenario for the production of dynamically cold rings around the Milky Way via a high-eccentricity, flyby encounter. These initial conditions are more cosmologically motivated than those...
Molecular Hydrogen and Global Star Formation Relations in Galaxies (2007)
Robertson, Brant, Kravtsov, Andrey
(ABRIDGED) We use hydrodynamical simulations of disk galaxies to study relations between star formation and properties of the molecular interstellar medium (ISM). We implement a model for the ISM...
The Role of Galactic Winds on Molecular Gas Emission from Galaxy Mergers (2007)
Narayanan, Desika, Cox, T. J., Kelly, Brandon, Dave, Romeel, Hernquist, Lars, Di Matteo, Tiziana, ...
We assess the impact of starburst and AGN feedback-driven winds on the CO emission from galaxy mergers, and, in particular, search for signatures of these winds in the simulated CO morphologies and...
An Observed Fundamental Plane Relation for Supermassive Black Holes (2007)
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Robertson, Brant, Krause, Elisabeth
We study observed correlations between supermassive black hole (BHs) and the properties of their host galaxies, and show that the observations define a BH 'fundamental plane' (BHFP), of the form M_BH...
The Nature of CO Emission From z~6 Quasars (2007)
Narayanan, Desika, Li, Yuexing, Cox, Thomas J., Hernquist, Lars, Hopkins, Philip, Chakrabarti, Sukanya, ...
We investigate the nature of CO emission from z~6 quasars by combining non-LTE radiative transfer calculations with merger-driven models of z~6 quasar formation that arise naturally in LCDM...
Photometric Properties of the Most Massive High-Redshift Galaxies (2007)
Robertson, Brant, Li, Yuexing, Cox, Thomas J., Hernquist, Lars, Hopkins, Philip F.
We calculate the observable properties of the most massive high-redshift galaxies in the hierarchical formation scenario where stellar spheroid and supermassive black hole growth are fueled by...
Are the Magellanic Clouds on their First Passage about the Milky Way? (2007)
Besla, Gurtina, Kallivayalil, Nitya, Hernquist, Lars, Robertson, Brant, Cox, T. J., Van Der Marel, Roeland P., ...
Recent proper motion measurements of the Large and Small Magellanic Clouds (LMC and SMC, respectively) by Kallivayalil et al (2006a,b) suggest that the 3D velocities of the Clouds are substantially...
A Theoretical Interpretation of the Black Hole Fundamental Plane (2007)
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Robertson, Brant, Krause, Elisabeth
We examine the origin and evolution of correlations between properties of supermassive black holes (BHs) and their host galaxies using simulations of major galaxy mergers, including the effects of...
Formation of z~6 quasars from hierarchical galaxy mergers (2007)
Li, Yuexing, Hernquist, Lars, Robertson, Brant, Cox, Thomas J., Hopkins, Philip F., Springel, Volker, ...
Is there a fundamental line for disk galaxies? (2006)
Simon, Joshua D., Prada, Francisco, Vílchez, José M., Blitz, Leo, Robertson, Brant
We show that there are strong local correlations between metallicity, surface brightness, and dynamical mass-to-light ratio with M33, analogous to the fundamental line of dwarf galaxies identified by...
Formation of z ~ 6 quasars from hierarchical galaxy mergers (2006)
Li, Yuexing, Hernquist, Lars, Robertson, Brant, Cox, Thomas J., Hopkins, Philip F., Springel, Volker, ...
The discovery of luminous quasars at redshift z ~ 6 indicates the presence of supermassive black holes (SMBHs) of mass ~10^9 Msun when the Universe was less than one billion years old. This finding...
Hopkins, Philip F., Robertson, Brant, Krause, Elisabeth, Hernquist, Lars, Cox, Thomas J.
We describe a model-independent integral constraint which defines an upper limit to the allowed degree of evolution in the ratio of black hole (BH) mass to host galaxy luminosity or mass, as a...
Kinematic Structure of Merger Remnants (2006)
Cox, T. J., Dutta, Suvendra N., Di Matteo, Tiziana, Hernquist, Lars, Hopkins, Philip F., Robertson, Brant, ...
We use numerical simulations to study the kinematic structure of remnants formed from mergers of equal-mass disk galaxies. In particular, we show that remnants of dissipational mergers, which include...
Is There a Fundamental Line for Disk Galaxies? (2006)
Simon, Joshua D., Prada, Francisco, Vilchez, Jose M., Blitz, Leo, Robertson, Brant
We show that there are strong local correlations between metallicity, surface brightness, and dynamical mass-to-light ratio within M33, analogous to the fundamental line of dwarf galaxies identified...
Chakrabarti, Sukanya, Cox, T. J., Hernquist, Lars, Hopkins, Philip F., Robertson, Brant, Di Matteo, Tiziana
We calculate infrared spectral energy distributions (SEDs) from simulations of major galaxy mergers and study the effect of AGN and starburst driven feedback on the evolution of the SED as a function...
Molecular Outflows in Galaxy Merger Simulations with Embedded AGN (2006)
Narayanan, Desika, Cox, Thomas J., Robertson, Brant, Dave, Romeel, Di Matteo, Tiziana, Hernquist, Lars, ...
We study the effects of feedback from active galactic nuclei (AGN) on emission from molecular gas in galaxy mergers by combining hydrodynamic simulations which include black holes with a...
Simulated Molecular Gas Emission in Galaxy Mergers with Embedded AGN (2006)
Narayanan, Desika, Cox, Thomas J., Robertson, Brant, Dave, Romeel, Di Matteo, Tiziana, Hernquist, Lars, ...
We investigate the effect of embedded active galactic nuclei (AGN) in galaxy mergers on the CO molecular line emission by combining non-local thermodynamic equilibrium (LTE) radiative transfer...
Hopkins, Philip F., Somerville, Rachel S., Hernquist, Lars, Cox, Thomas J., Robertson, Brant, Li, Yuexing
Using a model for self-regulated growth of black holes (BHs) in mergers involving gas-rich galaxies, we study the relationship between quasars and the population of merging galaxies and predict the...
The evolution in the faint-end slope of the quasar luminosity function (2006)
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Robertson, Brant, Di Matteo, Tiziana, Springel, Volker
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Di Matteo, Tiziana, Robertson, Brant, Springel, Volker
Determining the properties and evolution of red galaxies from the quasar luminosity function (2006)
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Robertson, Brant, Springel, Volker
The evolution of the MBH-σ relation (2006)
Robertson, Brant, Hernquist, Lars, Cox, Thomas J., Di Matteo, Tiziana, Hopkins, Philip F., Martini, Paul, ...
The fundamental scaling relations of elliptical galaxies (2006)
Robertson, Brant, Cox, Thomas J., Hernquist, Lars, Franx, Marijn, Hopkins, Philip F., Martini, Paul, ...
X-Ray emission from hot gas in galaxy mergers (2006)
Cox, T. J., Di Matteo, Tiziana, Hernquist, Lars, Hopkins, Philip F., Robertson, Brant, Springel, Volker
A merger-driven scenario for cosmological disk galaxy formation (2006)
Robertson, Brant, Bullock, James S., Cox, Thomas J., Di Matteo, Tiziana, Hernquist, Lars, Springel, Volker, ...
The kinematic structure of merger remnants (2006)
Cox, T. J., Dutta, Suvendra N., Di Matteo, Tiziana, Hernquist, Lars, Hopkins, Philip F., Robertson, Brant, ...
Hopkins, Philip F., Somerville, Rachel S., Hernquist, Lars, Cox, Thomas J., Robertson, Brant, Li, Yuexing
Using a model for the self-regulated growth of supermassive BHs in mergers involving gas-rich galaxies, we study the relationship between quasars and the population of merging galaxies and predict...
The Evolution in the Faint-End Slope of the Quasar Luminosity Function (2005)
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Di Matteo, Tiziana, Robertson, Brant, Springel, Volker
(Abridged) Based on numerical simulations of galaxy mergers that incorporate black hole (BH) growth, we predict the faint end slope of the quasar luminosity function (QLF) and its evolution with...
Determining the Properties and Evolution of Red Galaxies from the Quasar Luminosity Function (2005)
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Robertson, Brant, Springel, Volker
(Abridged) We study the link between quasars and the red galaxy population using a model for the self-regulated growth of supermassive black holes in mergers involving gas-rich galaxies. Using a...
The Luminosity Dependence of Quasar Clustering (2005)
Lidz, Adam, Hopkins, Philip F., Cox, Thomas J., Hernquist, Lars, Robertson, Brant
We investigate the luminosity dependence of quasar clustering, inspired by numerical simulations of galaxy mergers that incorporate black hole growth. These simulations have motivated a new...
Font, Andreea S., Johnston, Kathryn V., Bullock, James S., Robertson, Brant
We present a cosmologically motivated model for the hierachical formation of the stellar halo which includes a semi-analytic treatment of galactic chemical enrichment coupled to numerical simulations...
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Di Matteo, Tiziana, Robertson, Brant, Springel, Volker
We present an evolutionary model for starbursts, quasars, and spheroidal galaxies in which mergers between gas-rich galaxies drive nuclear inflows of gas, producing intense starbursts and feeding the...
The Evolution of the M-sigma Relation (2005)
Robertson, Brant, Hernquist, Lars, Cox, Thomas J., Di Matteo, Tiziana, Hopkins, Philip F., Martini, Paul, ...
(Abridged) We examine the evolution of the black hole mass - stellar velocity dispersion (M-sigma) relation over cosmic time using simulations of galaxy mergers that include feedback from...
Luminosity-Dependent Quasar Lifetimes: A New Interpretation of the Quasar Luminosity Function (2005)
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Di Matteo, Tiziana, Robertson, Brant, Springel, Volker
We propose a new interpretation of the quasar luminosity function (LF), derived from physically motivated models of quasar lifetimes and light curves. In our picture, quasars evolve rapidly and their...
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Di Matteo, Tiziana, Robertson, Brant, Springel, Volker
We consider implications of our new model of quasar lifetimes and light curves for the quasar luminosity function (LF) at different frequencies and redshifts. In our picture, quasars evolve rapidly...
Black Holes in Galaxy Mergers: Evolution of Quasars (2005)
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Di Matteo, Tiziana, Martini, Paul, Robertson, Brant, ...
Based on numerical simulations of gas-rich galaxy mergers, we discuss a model in which quasar activity is tied to the self-regulated growth of supermassive black holes in galaxies. Nuclear inflow of...
X-ray Emission from Hot Gas in Galaxy Mergers (2005)
Cox, T. J., Di Matteo, Tiziana, Hernquist, Lars, Hopkins, Philip F., Robertson, Brant, Springel, Volker
We examine X-ray emission produced from hot gas during collisions and mergers of disk galaxies. To study this process, we employ simulations that incorporate cosmologically motivated disk-galaxy...
A Merger-Driven Scenario for Cosmological Disk Galaxy Formation (2005)
Robertson, Brant, Bullock, James S., Cox, Thomas J., Di Matteo, Tiziana, Hernquist, Lars, Springel, Volker, ...
(Abridged) The violent hierarchical nature of the LCDM cosmology poses serious difficulties for the formation of disk galaxies. To help resolve these issues, we describe a new, merger-driven scenario...
A Physical Model for the Origin of Quasar Lifetimes (2005)
Hopkins, Philip F., Hernquist, Lars, Martini, Paul, Cox, Thomas J., Robertson, Brant, Di Matteo, Tiziana, ...
We propose a model of quasar lifetimes in which observational quasar lifetimes and an intrinsic lifetime of rapid accretion are strongly distinguished by the physics of obscuration by surrounding gas...
Lambda-Cold Dark Matter, Stellar Feedback, and the Galactic Halo Abundance Pattern (2005)
Robertson, Brant, Bullock, James S., Font, Andreea S., Johnston, Kathryn V., Hernquist, Lars
(Abridged) The hierarchical formation scenario for the stellar halo requires the accretion and disruption of dwarf galaxies, yet low-metallicity halo stars are enriched in alpha-elements compared to...
A physical model for the origin of quasar lifetimes (2005)
Hopkins, Philip F., Hernquist, Lars, Martini, Paul, Cox, Thomas J., Robertson, Brant, Di Matteo, Tiziana, ...
Black holes in galaxy mergers: evolution of quasars (2005)
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Di Matteo, Tiziana, Martini, Paul, Robertson, Brant, ...
Luminosity-dependent quasar lifetimes: a new interpretation of the quasar luminosity function (2005)
Hopkins, Philip F., Hernquist, Lars, Cox, Thomas J., Di Matteo, Tiziana, Robertson, Brant, Springel, Volker