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The X-Ray Zurich Environmental Study (X-ZENS). II. X-ray Observations of the Diffuse Intragroup Medium in Galaxy Groups
Francesco Miniati, Alexis Finoguenov, John D. Silverman +4
We present the results of a pilot XMM- and program aimed at studying the diffuse intragroup medium (DIM) of optically-selected nearby groups from the Zurinch ENvi…
Galaxy Zoo: Observing Secular Evolution Through Bars
Edmond Cheung, E. Athanassoula, Karen L. Masters +10
In this paper, we use the Galaxy Zoo 2 dataset to study the behavior of bars in disk galaxies as a function of specific star formation rate (SSFR), and bulge prominence. Our sample…
The X-ray Zurich Environmental Study (X-ZENS). I. Chandra and XMM-Newton observations of AGNs in galaxies in nearby groups
J. D. Silverman, F. Miniati, A. Finoguenov +4
We describe X-ray observations with Chandra and XMM-Newton of 18 galaxy groups (M_group ~ 1-6x10^13 Msolar, z~0.05) from the Zurich Environmental Study (ZENS). We aim to establish…
New observational Constraints on the Growth of the First Supermassive Black Holes
E. Treister, K. Schawinski, M. Volonteri +1
We constrain the total accreted mass density in supermassive black holes at z>6, inferred via the upper limit derived from the integrated X-ray emission from a sample of photometri…
Finding Rare AGN: XMM-Newton and Chandra Observations of SDSS Stripe 82
Stephanie M. LaMassa, C. Megan Urry, Nico Cappelluti +15
We have analyzed the {\it XMM-Newton} and {\it Chandra} data overlapping 16.5 deg of Sloan Digital Sky Survey Stripe 82, including 4.6 deg of proprietary {\it X…
The Obscured Fraction of AGN in the XMM-COSMOS Survey: A Spectral Energy Distribution Perspective
E. Lusso, J. F. Hennawi, A. Comastri +7
The fraction of AGN luminosity obscured by dust and re-emitted in the mid-IR is critical for understanding AGN evolution, unification, and parsec-scale AGN physics. For unobscured…