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Candidate Type II Quasars from the Sloan Digital Sky Survey: I. Selection and Optical Properties of a Sample at 0.3<Z<0.83
Nadia L. Zakamska, Michael A. Strauss, Julian H. Krolik +12
Type II quasars are the long-sought luminous analogs of type II (narrow emission line) Seyfert galaxies, suggested by unification models of active galactic nuclei (AGN) and postula…
Evolution of the Cluster Correlation Function
Neta A. Bahcall, Lei Hao, Paul Bode +1
We study the evolution of the cluster correlation function and its richness-dependence from z = 0 to z = 3 using large-scale cosmological simulations. A standard flat LCDM model wi…
Discovery of Eight New Extremely Metal--Poor Galaxies in the Sloan Digital Sky Survey
Alexei Y. Kniazev, Eva K. Grebel, Lei Hao +3
We report the discovery of eight new extremely metal-poor galaxies (XMPGs; 12+log(O/H) < 7.65) and the recovery of four previously known or suspected XMPGs (IZw18, HS0822+3542, HS0…
Double-Peaked Low-Ionization Emission Lines in Active Galactic Nuclei
Iskra V. Strateva, Michael A. Strauss, Lei Hao +1
We present a new sample of 116 double-peaked Balmer line Active Galactic Nuclei (AGN) selected from the Sloan Digital Sky Survey. Double-peaked emission lines are believed to origi…
The Richness-Dependent Cluster Correlation Function: Early SDSS Data
Neta A. Bahcall, Feng Dong, Lei Hao +4
The cluster correlation function and its richness dependence are determined from 1108 clusters of galaxies -- the largest sample of clusters studied so far -- found in 379 deg^2 of…
The First Data Release of the Sloan Digital Sky Survey
The SDSS collaboration, Kevork Abazajian
The Sloan Digital Sky Survey has validated and made publicly available its First Data Release. This consists of 2099 square degrees of five-band (u, g, r, i, z) imaging data, 186,2…