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The thick disk in the galaxy NGC 4244 from S4G imaging
Sébastien Comerón, Johan H. Knapen, Kartik Sheth +16
If thick disks are ubiquitous and a natural product of disk galaxy formation and/or evolution processes, all undisturbed galaxies which have evolved during a significant fraction o…
On the Origin of Ultraviolet Emission and the Accretion Model of Low-luminosity AGNs
Zhaolong Yu, Feng Yuan, Luis Ho
Low-luminosity active galactic nuclei (LLAGNs) are generally believed to be powered by an inner radiatively inefficient, advection-dominated accretion flow (ADAF), an outer truncat…
The Spitzer Survey of Stellar Structure in Galaxies (S^4G)
Kartik Sheth, Michael Regan, Joannah L. Hinz +35
The Spitzer Survey of Stellar Structure in Galaxies S^4G is an Exploration Science Legacy Program approved for the Spitzer post-cryogenic mission. It is a volume-, magnitude-, and…
The Prevalence of Narrow Optical Fe II Emission Lines in Type 1 Active Galactic Nuclei
Xiao-Bo Dong, Luis C. Ho, Jian-Guo Wang +4
From detailed spectral analysis of a large sample of low-redshift active galactic nuclei (AGNs) selected from the Sloan Digital Sky Survey, we demonstrate---statistically for the f…
Mid-Infrared Galaxy Morphology from the Spitzer Survey of Stellar Structure in Galaxies (S^4G): The Imprint of the de Vaucouleurs Revised Hubble-Sandage Classification System at 3.6 microns
R. Buta, K. Sheth, M. Regan +17
Spitzer Space Telescope Infrared Array Camera (IRAC) imaging provides an opportunity to study all known morphological types of galaxies in the mid-IR at a depth significantly bette…
AEGIS: Demographics of X-ray and Optically Selected AGNs
Renbin Yan, Luis C. Ho, Jeffrey A. Newman +19
We develop a new diagnostic method to classify galaxies into AGN hosts, star-forming galaxies, and absorption-dominated galaxies by combining the [O III]/Hbeta ratio with rest-fram…