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The Impact of the Uncertainty in Single-Epoch Virial Black Hole Mass Estimates on the Observed Evolution of the Black Hole - Bulge Scaling Relations
Yue Shen, Brandon C. Kelly
Recent observations of the black hole (BH) - bulge scaling relations usually report positive redshift evolution, with higher redshift galaxies harboring more massive BHs than expec…
The Nature of Optically Dull Active Galactic Nuclei in COSMOS
Jonathan R. Trump, Chris D. Impey, Yoshi Taniguchi +17
We present infrared, optical, and X-ray data of 48 X-ray bright, optically dull AGNs in the COSMOS field. These objects exhibit the X-ray luminosity of an active galactic nucleus (…
Observational Limits on Type 1 AGN Accretion Rate in COSMOS
Jonathan R. Trump, Chris D. Impey, Brandon C. Kelly +13
We present black hole masses and accretion rates for 182 Type 1 AGN in COSMOS. We estimate masses using the scaling relations for the broad Hb, MgII, and CIV emission lines in the…
Are the Variations in Quasar Optical Flux Driven by Thermal Fluctuations?
Brandon C. Kelly, Jill Bechtold, Aneta Siemiginowska
We analyze a sample of optical light curves for 100 quasars, 70 of which have black hole mass estimates. Our sample is the largest and broadest used yet for modeling quasar variabi…
The low level of debris disk activity at the time of the Late Heavy Bombardment: a Spitzer study of Praesepe
A. Gaspar, G. H. Rieke, K. Y. L. Su +5
We present 24 micron photometry of the intermediate-age open cluster Praesepe. We assemble a catalog of 193 probable cluster members that are detected in optical databases, the Two…