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Galaxy Assembly Bias on the Red Sequence
Michael C. Cooper, Anna Gallazzi, Jeffrey A. Newman +1
Using samples drawn from the Sloan Digital Sky Survey, we study the relationship between local galaxy density and the properties of galaxies on the red sequence. After removing the…
Groups of Galaxies in AEGIS: The 200 ksec Chandra Extended X-ray Source catalogue
Tesla E. Jeltema, Brian F. Gerke, Elise S. Laird +6
We present the discovery of seven X-ray emitting groups of galaxies selected as extended X-ray sources in the 200 ksec Chandra coverage of the All-wavelength Extended Groth Strip I…
A 1.75 kpc/h Separation Dual AGN at z=0.36 in the COSMOS Field
Julia M. Comerford, Roger L. Griffith, Brian F. Gerke +4
We present strong evidence for dual active galactic nuclei (AGN) in the z=0.36 galaxy COSMOS J100043.15+020637.2. COSMOS Hubble Space Telescope (HST) imaging of the galaxy shows a…
Astronomical Software Wants To Be Free: A Manifesto
Benjamin J. Weiner, Michael R. Blanton, Alison L. Coil +13
Astronomical software is now a fact of daily life for all hands-on members of our community. Purpose-built software for data reduction and modeling tasks becomes ever more critical…
AEGIS: The Clustering of X-ray AGN Relative to Galaxies at z~1
Alison L. Coil, Antonis Georgakakis, Jeffrey A. Newman +9
We measure the clustering of non-quasar X-ray AGN at z=0.7-1.4 in the AEGIS field. Using the cross-correlation of 113 Chandra-selected AGN, with a median log L_X=42.8 erg s^-1, wit…
The Large-Scale Environments of Type Ia Supernovae: Evidence for a Metallicity Bias in the Rate or Luminosity of Prompt Ia Events
Michael C. Cooper, Jeffrey A. Newman, Renbin Yan
Using data drawn from the Sloan Digital Sky Survey (SDSS) and the SDSS-II Supernova Survey, we study the local environments of confirmed type Ia supernovae (SNe Ia) in the nearby U…