Search Publications
The Emission by Dust and Stars of Nearby Galaxies in the Herschel KINGFISH Survey
Murphy, Eric; Gordon, Karl D.; Johnson, Benjamin D. +29 more
Using new far-infrared imaging from the Herschel Space Observatory with ancillary data from ultraviolet (UV) to submillimeter wavelengths, we estimate the total emission from dust and stars of 62 nearby galaxies in the KINGFISH survey in a way that is as empirical and model independent as possible. We collect and exploit these data in order to mea…
The Diversity of Massive Star Outbursts. I. Observations of SN2009ip, UGC 2773 OT2009-1, and Their Progenitors
Foley, Ryan J.; Levesque, Emily M.; Berger, Edo +5 more
Despite both being outbursts of luminous blue variables (LBVs), SN 2009ip and UGC 2773 OT2009-1 have very different progenitors, spectra, circumstellar environments, and possibly physical mechanisms that generated the outbursts. From pre-eruption Hubble Space Telescope images, we determine that SN 2009ip and UGC 2773 OT2009-1 have initial masses o…
Black Hole Mass Estimates Based on C IV are Consistent with Those Based on the Balmer Lines
Stern, D.; Kozłowski, S.; Quirrenbach, A. +39 more
Using a sample of high-redshift lensed quasars from the CASTLES project with observed-frame ultraviolet or optical and near-infrared spectra, we have searched for possible biases between supermassive black hole (BH) mass estimates based on the C IV, Hα, and Hβ broad emission lines. Our sample is based upon that of Greene, Peng, & Ludwig, expan…
Red Nuggets at High Redshift: Structural Evolution of Quiescent Galaxies Over 10 Gyr of Cosmic History
Glazebrook, Karl; McCarthy, Patrick J.; Yan, Haojing +15 more
We present an analysis of the size growth seen in early-type galaxies over 10 Gyr of cosmic time. Our analysis is based on a homogeneous synthesis of published data from 16 spectroscopic surveys observed at similar spatial resolution, augmented by new measurements for galaxies in the Gemini Deep Deep Survey. In total, our sample contains structura…
Galaxies in X-Ray Groups. I. Robust Membership Assignment and the Impact of Group Environments on Quenching
Koekemoer, Anton M.; Coccato, Lodovico; Leauthaud, Alexie +19 more
Understanding the mechanisms that lead dense environments to host galaxies with redder colors, more spheroidal morphologies, and lower star formation rates than field populations remains an important problem. As most candidate processes ultimately depend on host halo mass, accurate characterizations of the local environment, ideally tied to halo m…
GOODS-Herschel: Gas-to-dust Mass Ratios and CO-to-H2 Conversion Factors in Normal and Starbursting Galaxies at High-z
Aussel, H.; Daddi, E.; Elbaz, D. +15 more
We explore the gas-to-dust mass ratio (M gas/M d) and the CO luminosity-to-M gas conversion factor (αCO) of two well-studied galaxies in the Great Observatories Origins Deep Survey North field that are expected to have different star-forming modes, the starburst GN20 at z = 4.05 and the normal star-formi…
Accretion Rate and the Physical Nature of Unobscured Active Galaxies
Koekemoer, Anton M.; Trump, Jonathan R.; Urry, C. Megan +15 more
We show how accretion rate governs the physical properties of a sample of unobscured broad-line, narrow-line, and lineless active galactic nuclei (AGNs). We avoid the systematic errors plaguing previous studies of AGN accretion rates by using accurate intrinsic accretion luminosities (L int) from well-sampled multiwavelength spectral en…
The XMM-Newton Wide Field Survey in the COSMOS Field: Redshift Evolution of AGN Bias and Subdominant Role of Mergers in Triggering Moderate-luminosity AGNs at Redshifts up to 2.2
Finoguenov, A.; Salvato, M.; Merloni, A. +14 more
We present a study of the redshift evolution of the projected correlation function of 593 X-ray selected active galactic nuclei (AGNs) with I AB < 23 and spectroscopic redshifts z < 4, extracted from the 0.5-2 keV X-ray mosaic of the 2.13 deg2 XMM- Cosmic Evolution Survey (COSMOS). We introduce a method to estimate the …
The Relative Abundance of Compact and Normal Massive Early-type Galaxies and Its Evolution from Redshift z ~ 2 to the Present
Dickinson, M.; Giavalisco, M.; Koekemoer, A. M. +11 more
We report on the evolution of the number density and size of early-type galaxies (ETGs) from z ~ 2 to z ~ 0. We select a sample of 563 massive (M > 1010 M ⊙), passively evolving (specific star formation rate <10-2 Gyr-1), and morphologically spheroidal galaxies at 0 < z < 2.5, using the panch…
Demographics of Bulge Types within 11 Mpc and Implications for Galaxy Evolution
Drory, Niv; Fisher, David B.
We present an inventory of galaxy bulge types (elliptical galaxy, classical bulge, pseudobulge, and bulgeless galaxy) in a volume-limited sample within the local 11 Mpc sphere using Spitzer 3.6 µm and Hubble Space Telescope data. We find that whether counting by number, star formation rate, or stellar mass, the dominant galaxy type in the lo…