Publications (20)
Volume-limited SDSS/FIRST quasars and the radio dichotomy
S. Jester, R. Kron
Much evidence has been presented in favor of and against the existence of two distinct populations of quasars, radio-loud and radio-quiet. The SDSS differs from earlier optically s…
Discovery of an X-ray Jet and Extended Jet Structure in the Quasar PKS 1055+201
D. A. Schwartz, H. L. Marshall, J. E. J. Lovell +10
This letter reports rich X-ray jet structures found in the Chandra observation of PKS 1055+201. In addition to an X-ray jet coincident with the radio jet we detect a region of exte…
A Comparison of SDSS Standard Star Catalog for Stripe 82 with Stetson's Photometric Standards
Z. Ivezic, J. A. Smith, G. Miknaitis +21
We compare Stetson's photometric standards with measurements listed in a standard star catalog constructed using repeated SDSS imaging observations. The SDSS catalog includes over…
The 2dF-SDSS LRG and QSO Survey: The z<2.1 Quasar Luminosity Function from 5645 Quasars to g=21.85
G. T. Richards, S. M. Croom, S. F. Anderson +25
We have used the 2dF instrument on the AAT to obtain redshifts of a sample of z<3, 18.0<g<21.85 quasars selected from SDSS imaging. These data are part of a larger joint programme:…
Polarimetry and the High-Energy Emission Mechanisms in Quasar Jets
M. Cara, E. S. Perlman, Y. Uchiyama +15
The emission mechanisms in extragalactic jets include synchrotron and various inverse-Compton processes. At low (radio through infrared) energies, it is widely agreed that synchrot…
What ignites optical jets?
S. Jester
The properties of radio galaxies and quasars with and without optical or X-ray jets are compared. The majority of jets from which high-frequency emission has been detected so far (…
A high-resolution multi-wavelength study of the jet in 3C 273
S. Jester, H. -J. Roeser, K. Meisenheimer +2
We present HST images at 622 nm and 300 nm of the optical jet in 3C273 and determine the run of the optical spectral index at 0.2" along the jet. We find no evidence for localized…
The 2dF-SDSS LRG and QSO survey: Evolution of the Luminosity Function of Luminous Red Galaxies to z=0.6
D. A. Wake, R. C. Nichol, D. J. Eisenstein +23
We present new measurements of the luminosity function (LF) of Luminous Red Galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS) and the 2dF-SDSS LRG and Quasar (2SLAQ) survey.…
NIR spectroscopy of SDSS J0303-0019: a low luminosity, high Eddington ratio quasar at z~6
J. D. Kurk, F. Walter, X. Fan +4
We present sensitive near--infrared VLT ISAAC spectroscopic observations of the z=6.08 quasar SDSS J030331.40-001912.9. This QSO is more than a magnitude fainter than other QSOs at…
New Chandra observations of the jet in 3C273. I. Softer X-ray than radio spectra and the X-ray emission mechanism
S. Jester, D. E. Harris, H. L. Marshall +1
The jet in 3C273 is a high-power quasar jet with radio, optical and X-ray emission whose size and brightness allow a detailed study of the emission processes acting in it. We prese…
X-rays from the jet in 3C 273: clues from the radio-optical spectra
S. Jester, H. -J. Roeser, K. Meisenheimer +1
Using new deep VLA and HST observations of the large-scale jet in 3C273 matched to 0.3" resolution, we have detected excess near-ultraviolet emission (300 nm) above a synchrotron c…
Shedding New Light on the 3C 273 Jet with the Spitzer Space Telescope
Y. Uchiyama, C. M. Urry, C. C. Cheung +7
We have performed infrared imaging of the jet of the quasar 3C 273 at wavelengths 3.6 and 5.8 microns with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. When com…
The radio-ultraviolet spectral energy distribution of the jet in 3C273
S. Jester, H. -J. Roeser, K. Meisenheimer +1
We present deep VLA and HST observations of the large-scale jet in 3C 273 matched to 0.3" resolution. The observed spectra show a significant flattening in the infrared-ultraviolet…
SDSS spectroscopic survey of stars
Z. Ivezic, D. Schlegel, A. Uomoto +37
In addition to optical photometry of unprecedented quality, the Sloan Digital Sky Survey (SDSS) is also producing a massive spectroscopic database. We discuss determination of stel…
Measuring the accretion rate and kinetic luminosity functions of supermassive black holes
E. G. Koerding, S. Jester, R. Fender
We derive accretion rate functions (ARFs) and kinetic luminosity functions (KLF) for jet-launching supermassive black holes. The accretion rate as well as the kinetic power of an a…
HST optical spectral index map of the jet of 3C 273
S. Jester, H. -J. Roeser, K. Meisenheimer +2
We present HST images at 622 nm and 300 nm of the jet in 3C273 and determine the run of the optical spectral index at 0.2" along the jet. The smoothness of spectral index changes s…
Luminosity and Redshift Dependence of Quasar Spectral Properties
D. E. Vanden Berk, C. -Y. Yip, A. J. Connolly +2
Using a large sample of quasar spectra from the SDSS, we examine the composite spectral trends of quasars as functions of both redshift and luminosity, independently of one another…
Lessons Learned from Sloan Digital Sky Survey Operations
S. J. Kleinman, J. E. Gunn, B. Boroski +12
Astronomy is changing. Large projects, large collaborations, and large budgets are becoming the norm. The Sloan Digital Sky Survey (SDSS) is one example of this new astronomy, and…
X-ray Emission from the 3C 273 Jet
H. L. Marshall, S. Jester, D. E. Harris +1
We present results from four recent Chandra monitoring observations of the jet in 3C 273 using the ACIS detector, obtained between November 2003 and July 2004. We find that the X-r…
The Sloan Digital Sky Survey Quasar Catalog III. Third Data Release
D. P. Schneider, P. B. Hall, G. T. Richards +50
We present the third edition of the Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog consists of the 46,420 objects in the SDSS Third Data Release that have luminosities…