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17 papers · 2 filters
Detecting the Rise and Fall of 21 cm Fluctuations with the Murchison Widefield Array
Adam Lidz, Oliver Zahn, Matthew McQuinn +2
We forecast the sensitivity with which the Murchison Widefield Array (MWA) can measure the 21 cm power spectrum of cosmic hydrogen, using radiative transfer simulations to model re…
Molecular Star Formation Rate Indicators in Galaxies
Desika Narayanan, Thomas J. Cox, Yancy Shirley +3
We derive a physical model for the observed relations between star formation rate (SFR) and molecular line (CO and HCN) emission in galaxies, and show how these observed relations…
Probing the Neutral Fraction of the IGM with GRBs during the Epoch of Reionization
Matthew McQuinn, Adam Lidz, Matias Zaldarriaga +2
We show that near-infrared observations of the red side of the Ly-alpha line from a single gamma ray burst (GRB) afterglow cannot be used to constrain the global neutral fraction o…
The Role of Galactic Winds on Molecular Gas Emission from Galaxy Mergers
Desika Narayanan, T. J. Cox, Brandon Kelly +7
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…
Rest-Frame Ultraviolet to Near Infrared Observations of an Interacting Lyman Break Galaxy at z = 4.42
Joshua D. Younger, Jia-Sheng Huang, Giovanni G. Fazio +11
We present the rest-frame ultraviolet through near infrared spectral energy distribution for an interacting Lyman break galaxy at a redshift z=4.42, the highest redshift merging sy…
Antitruncated Stellar Disks via Minor Mergers
Joshua D. Younger, T. J. Cox, Anil C. Seth +1
We use hydrodynamic simulations of minor mergers of galaxies to investigate the nature of surface brightness excesses at large radii observed in some spiral galaxies: antitruncated…
An Observed Fundamental Plane Relation for Supermassive Black Holes
Philip F. Hopkins, Lars Hernquist, Thomas J. Cox +2
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…
The Nature of CO Emission From z~6 Quasars
Desika Narayanan, Yuexing Li, Thomas J. Cox +9
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 naturall…
A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: II. Formation of Red Ellipticals
Philip F. Hopkins, Thomas J. Cox, Dusan Keres +1
(Abridged) We develop and test a model for the cosmological role of mergers in the formation and quenching of red, early-type galaxies. Making the ansatz that star formation is que…
A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
Philip F. Hopkins, Lars Hernquist, Thomas J. Cox +1
(Abridged) We develop a model for the cosmological role of mergers in the evolution of starbursts, quasars, and spheroidal galaxies. Combining halo mass functions (MFs) with empiri…
Direct cosmological simulations of the growth of black holes and galaxies
Tiziana Di Matteo, Joerg Colberg, Volker Springel +2
We investigate the coupled formation and evolution of galaxies and their embedded supermassive black holes using state-of-the-art hydrodynamic simulations of cosmological structure…
Studying Reionization with Ly-alpha Emitters
Matthew McQuinn, Lars Hernquist, Matias Zaldarriaga +1
We show that observations of high-redshift Ly-alpha emitters (LAEs) have the potential to provide definitive evidence for reionization in the near future. Using 200 Mpc radiative t…
Quasar Proximity Zones and Patchy Reionization
Adam Lidz, Matthew McQuinn, Matias Zaldarriaga +2
Lyman-alpha forest absorption spectra towards quasars at z ~ 6 show regions of enhanced transmission close to their source. Several authors have argued that the apparently small si…
Are the Magellanic Clouds on their First Passage about the Milky Way?
Gurtina Besla, Nitya Kallivayalil, Lars Hernquist +4
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…
Photometric Properties of the Most Massive High-Redshift Galaxies
Brant Robertson, Yuexing Li, Thomas J. Cox +2
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 a…
A Theoretical Interpretation of the Black Hole Fundamental Plane
Philip F. Hopkins, Lars Hernquist, Thomas J. Cox +2
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, includin…
The Line-of-Sight Proximity Effect and the Mass of Quasar Host Halos
C. -A. Faucher-Giguere, A. Lidz, M. Zaldarriaga +1
We show that the Lyman-alpha optical depth statistics in the proximity regions of quasar spectra depend on the mass of the dark matter halos hosting the quasars. This is owing to b…