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The Color Variability of Quasars
Kasper B. Schmidt, Hans-Walter Rix, Joseph C. Shields +4
We quantify quasar color-variability using an unprecedented variability database - ugriz photometry of 9093 quasars from SDSS Stripe 82, observed over 8 years at ~60 epochs each. W…
First Results from the 3D-HST Survey: The Striking Diversity of Massive Galaxies at z>1
Pieter G. van Dokkum, Gabriel Brammer, Mattia Fumagalli +26
We present first results from the 3D-HST program, a near-IR spectroscopic survey performed with the Wide Field Camera 3 on the Hubble Space Telescope. We have used 3D-HST spectra t…
Discovering the missing 2.2<z<3 quasars by combining optical variability and optical/near-IR colors
Xue-Bing Wu, Ran Wang, Kasper B. Schmidt +3
The identifications of quasars in the redshift range 2.2<z<3 are known to be very inefficient as their optical colors are indistinguishable from those of stars. Recent studies have…