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52 papers · 2 filters
Type Ia Supernovae are Good Standard Candles in the Near Infrared: Evidence from PAIRITEL
W. Michael Wood-Vasey, Andrew S. Friedman, Joshua S. Bloom +11
We have obtained 1087 NIR (JHKs) measurements of 21 SNe Ia using PAIRITEL, nearly doubling the number of well-sampled NIR SN Ia light curves. These data strengthen the evidence tha…
Kinematics and Composition of the Galactic Bulge: Recent Progress
R. Michael Rich, Christian Howard, David B. Reitzel +2
We present recent results from a Keck study of the composition of the Galactic bulge, as well as results from the bulge Bulge Radial Velocity Assay (BRAVA). Culminating a 10 year i…
Constraining Cosmic Evolution of Type Ia Supernovae
Ryan J. Foley, A. V. Filippenko, C. Aguilera +27
We present the first large-scale effort of creating composite spectra of high-redshift type Ia supernovae (SNe Ia) and comparing them to low-redshift counterparts. Through the ESSE…
Scaling relations of the colour-detected cluster RzCS 052 at z=1.016 and of some other high redshift clusters
S. Andreon, R. De Propris, E. Puddu +2
We report on the discovery of the z=1.016 cluster RzCS 052 using a modified red sequence method, followup spectroscopy and X-ray imaging. This cluster has a velocity dispersion of…
Morphologies of Two Massive Old Galaxies at z ~ 2.5
Alan Stockton, Elizabeth McGrath, Gabriela Canalizo +2
We present the results of NICMOS imaging of two massive galaxies photometrically selected to have old stellar populations at z ~ 2.5. Both galaxies are dominated by apparent disks…
The Luminosity Function of X-ray Selected Active Galactic Nuclei: Evolution of Supermassive Black Holes at High Redshift
J. D. Silverman, P. J. Green, W. A. Barkhouse +9
We present a measure of the hard (2-8 keV) X-ray luminosity function (XLF) of Active Galactic Nuclei up to z~5. At high redshifts, the wide area coverage of the Chandra Multiwaveng…