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- Space Telescope Science InstituteUS106 papers
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203 papers · 1 filter
The Optical and Near-Infrared Properties of 2837 Quasars in the UKIRT Infrared Deep Sky Survey (UKIDSS)
Kuenley Chiu, Gordon T. Richards, Paul C. Hewett +1
The UKIRT Infrared Deep Sky Survey (UKIDSS) is the first of a new generation of hemispheric imaging projects to extend the work of the Two Micron All Sky Survey (2MASS) by reaching…
New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
Adam G. Riess, Louis-Gregory Strolger, Stefano Casertano +18
We have discovered 21 new Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and have used them to trace the history of cosmic expansion over the last 10 billion yea…
An XMM-Newton view of the X-ray flat radio-quiet quasar PG 1416-129
D. Porquet, J. N. Reeves, A. Markowitz +3
(abridged) The radio-quiet quasar PG1416-129 (z=0.129) exhibits atypical optical and X-ray properties. Between 1990 and 2000, in response to its optical continuum decrease, the ``c…
Electronic Structure of Electron-doped Sm1.86Ce0.14CuO4: Strong `Pseudo-Gap' Effects, Nodeless Gap and Signatures of Short Range Order
S. R. Park, Y. S. Roh, Y. K. Yoon +7
Angle resolved photoemission (ARPES) data from the electron doped cuprate superconductor SmCeCuO shows a much stronger pseudo-gap or "hot-spot" effect than th…
GALEX Ultraviolet Photometry of Globular Clusters in M31: Three Year Results and a Catalog
Soo-Chang Rey, R. Michael Rich, Sangmo T. Sohn +23
We present ultraviolet (UV) photometry of M31 globular clusters (GCs) found in 23 Galaxy Evolution Explorer (GALEX) images covering the entirety of M31. We detect 485 and 273 GCs (…
Clustering Analyses of 300,000 Photometrically Classified Quasars--II. The Excess on Very Small Scales
Adam D. Myers, Robert J. Brunner, Gordon T. Richards +3
We study quasar clustering on small scales, modeling clustering amplitudes using halo-driven dark matter descriptions. From 91 pairs on scales <35 kpc/h, we detect only a slight ex…