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Candidate Type II Quasars from the SDSS: III. Spectropolarimetry Reveals Hidden Type I Nuclei
Nadia L. Zakamska, Gary D. Schmidt, Paul S. Smith +7
We have conducted spectropolarimetry of 12 type II (obscured) quasar candidates selected from the spectroscopic database of the Sloan Digital Sky Survey based on their emission lin…
The Third Data Release of the Sloan Digital Sky Survey
K. Abazajian et al.
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through June 2003, includes imaging data in five bands ov…
The spatial clustering of X-ray selected AGN and galaxies in the Chandra Deep Field South and North
R. Gilli, E. Daddi, G. Zamorani +10
We investigate the spatial clustering of X-ray selected sources in the two deepest X-ray fields to date, namely the 2Msec Chandra Deep Field North (CDFN) and the 1Msec Chandra Deep…
Photometric Redshift of X-Ray Sources in the Chandra Deep Field South
W. Zheng, V. J. Mikles, V. Mainieri +10
Based on the photometry of 10 near-UV, optical, and near-infrared bands of the Chandra Deep Field South, we estimate the photometric redshifts for 342 X-ray sources, which constitu…
Dust Reddening in SDSS Quasars
Philip F. Hopkins, Michael A. Strauss, Patrick B. Hall +7
We explore the form of extragalactic reddening toward quasars using a sample of 9566 quasars with redshifts 0<z<2.2, and accurate optical colors from the Sloan Digital Sky Survey (…
A catalogue of the Chandra Deep Field South with multi-colour classification and photometric redshifts from COMBO-17
C. Wolf, K. Meisenheimer, M. Kleinheinrich +9
We present the COMBO-17 object catalogue of the Chandra Deep Field South for public use, covering a field which is 31.5' x 30' in size. This catalogue lists astrometry, photometry…