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Monthly Notices of the Royal Astronomical Society | 2007

MegaZ-LRG:a photometric redshift catalogue of one million SDSS luminous red galaxies

Adrian Collister; Ofer Lahav; Chris Blake; Russell D. Cannon; Scott M. Croom; Michael J. Drinkwater; A. C. Edge; Daniel J. Eisenstein; Jon Loveday; Robert C. Nichol; Kevin A. Pimbblet; Roberto De Propris; I. G. Roseboom; N. Ross; Donald P. Schneider; T. Shanks; David A. Wake

We describe the construction of MegaZ-LRG, a photometric redshift catalogue of over one million luminous red galaxies (LRGs) in the redshift range 0.4 < z < 0.7 with limiting magnitude i < 20. The catalogue is selected from the imaging data of the Sloan Digital Sky Survey (SDSS) Data Release 4. The 2dF-SDSS LRG and Quasar (2SLAQ) spectroscopic redshift catalogue of 13 000 intermediate-redshift LRGs provides a photometric redshift training set, allowing use of annz, a neural network-based photometric-redshift estimator. The rms photometric redshift accuracy obtained for an evaluation set selected from the 2SLAQ sample is sigma(z) 0.049 averaged over all galaxies, and sigma(z) = 0.040 for a brighter subsample (i < 19.0). The catalogue is expected to contain similar to 5 per cent stellar contamination. The annz code is used to compute a refined star/galaxy probability based on a range of photometric parameters; this allows the contamination fraction to be reduced to 2 per cent with negligible loss of genuine galaxies. The MegaZ-LRG catalogue is publicly available on the World Wide Web from http://www.2slaq.info.


Monthly Notices of the Royal Astronomical Society | 2006

The 2dF-SDSS LRG and QSO Survey: the star formation histories of luminous red galaxies

I. G. Roseboom; Kevin A. Pimbblet; Michael J. Drinkwater; Russell D. Cannon; Roberto De Propris; A. C. Edge; Daniel J. Eisenstein; Robert C. Nichol; Ian Smail; David A. Wake; Joss Bland-Hawthorn; Terry J. Bridges; Daniel Carson; Matthew Colless; Warrick J. Couch; Scott M. Croom; Simon P. Driver; Paul C. Hewett; Jon Loveday; N. Ross; Donald P. Schneider; T. Shanks; Rob Sharp; Peter M. Weilbacher

We present a detailed investigation into the recent star formation histories of 5697 luminous red galaxies (LRGs) based on the Hδ (4101 A), and [O II] (3727 A) lines and the D4000 index. LRGs are luminous (L > 3L ∗ ) galaxies which have been selected to have photometric properties consistent with an old, passively evolving stellar population. For this study, we utilize LRGs from the recently completed 2dF-SDSS LRG and QSO Survey (2SLAQ). Equivalent widths of the Hδ and [O II] lines are measured and used to define three spectral types, those with only strong Hδ absorption (k+a), those with strong [O II] in emission (em) and those with both (em+a). All other LRGs are considered to have passive star formation histories. The vast majority of LRGs are found to be passive (∼80 per cent); however, significant numbers of k+a (2.7 per cent), em+a (1.2 per cent) and em LRGs (8.6 per cent) are identified. An investigation into the redshift dependence of the fractions is also performed. A sample of SDSS MAIN galaxies with colours and luminosities consistent with the 2SLAQ LRGs is selected to provide a low-redshift comparison. While the em and em+a fractions are consistent with the low-redshift SDSS sample, the fraction of k+a LRGs is found to increase significantly with redshift. This result is interpreted as an indication of an increasing amount of recent star formation activity in LRGs with redshift. By considering the expected lifetime of the k+a phase, the number of LRGs which will undergo a k+a phase can be estimated. A crude comparison of this estimate with the predictions from semi-analytic models of galaxy formation shows that the predicted


Monthly Notices of the Royal Astronomical Society | 2007

The 2dF-SDSS LRG and QSO Survey: QSO clustering and the L-z degeneracy

J. DaÂngela; T. Shanks; Scott M. Croom; Peter M. Weilbacher; Robert J. Brunner; Warrick J. Couch; Lance Miller; Adam D. Myers; Robert C. Nichol; Kevin A. Pimbblet; R. De Propris; Gordon T. Richards; N. Ross; Donald P. Schneider; David A. Wake


Monthly Notices of the Royal Astronomical Society | 2005

The 2dF–SDSS LRG and QSO (2SLAQ) Survey: the z < 2.1 quasar luminosity function from 5645 quasars to g= 21.85

Gordon T. Richards; Scott M. Croom; Scott F. Anderson; Joss Bland-Hawthorn; B. J. Boyle; Roberto De Propris; Michael J. Drinkwater; Xiaohui Fan; James E. Gunn; Željko Ivezić; Sebastian Jester; Jon Loveday; Avery Meiksin; Lance Miller; Adam D. Myers; Robert C. Nichol; Phil J. Outram; Kevin A. Pimbblet; I. G. Roseboom; N. Ross; Donald P. Schneider; T. Shanks; Rob Sharp; Chris Stoughton; Michael A. Strauss; Alexander S. Szalay; Daniel E. Vanden Berk; Donald G. York


Monthly Notices of the Royal Astronomical Society | 2005

The 2dF-SDSS LRG and QSO (2SLAQ) Survey: the z g = 21.85

Gordon T. Richards; Scott M. Croom; Scott F. Anderson; Joss Bland-Hawthorn; B. J. Boyle; Roberto De Propris; Michael J. Drinkwater; Xiaohui Fan; James E. Gunn; Zeljko Ivezic; Sebastian Jester; Jon Loveday; Avery Meiksin; Lance L. Miller; Adam D. Myers; Robert C. Nichol; P. J. Outram; Kevin A. Pimbblet; I. G. Roseboom; N. Ross; Donald P. Schneider; T. Shanks; Rob Sharp; Christopher Stoughton; Michael A. Strauss; Alexander S. Szalay; Daniel E. Vanden Berk; Donald G. York


VizieR Online Data Catalog | 2010

VizieR Online Data Catalog: The SDSS-DR7 quasar catalog (Schneider+, 2010)

Donald P. Schneider; Gordon T. Richards; P.B. Hall; Strauss; Scott F. Anderson; Todd A. Boroson; N. Ross; Yuen Ron Shen; W. N. Brandt; Xiaohui Fan; Naohisa Inada; Sebastian Jester; Gillian R. Knapp; Coleman M. Krawczyk; Anirudda R. Thakar; D.E. vanden Berk; W. Voges; Brian Yanny; D. G. York; Neta A. Bahcall; Dmitry Bizyaev; Michael R. Blanton; Howard J. Brewington; J. Brinkmann; Daniel J. Eisenstein; J. Frieman; Masataka Fukugita; Jim Gray; James E. Gunn; Pascale Hibon


IAU General Assembly | 2015

Extreme Red Quasars in SDSS-BOSS

Fred Hamann; Nadia L. Zakamska; Isabelle Paris; H. Herbst; C. Villforth; Rachael Alexandroff; N. Ross; Jenny E. Greene; Michael A. Strauss


Archive | 2013

A ''WISE BOSS'':Finding the cosmic monsters in the mid-infrared lochs

N. Ross; Fred Hamann; Rachael Alexandroff; W. N. Brandt; Michael A. Strauss; Arjun Dey; Gordon T. Richards; G. Worseck; Nadia L. Zakamska; Daniel J. Eisenstein; Junqiang Ge; Eilat Glikman; Jenny E. Greene; Daryl Haggard; J. H. Krolik; Adam D. Myers; Patrick Petitjean; Alina Streblyanska; Kevin Schawinski; Yue Shen; C. Villforth; Richard G. McMahon


American Astronomical Society | 2012

Dense Sampling and Large Volume: The Structure of the Intergalactic Medium from 50,000 SDSS3 BOSS Quasar Absorption Spectra

Rupert A. C. Croft; E. Arnau; Eric Aubourg; S. Bailey; Jill Bechtold; Vaishali Bhardwaj; Adam S. Bolton; Arnaud Borde; J. Brinkmann; Nicolás G. Busca; W. Carithers; Renyue Cen; R. Charlassier; Marina Cortês; A. Dall'Aglio; S. Cristiani; Kyle S. Dawson; Timothée Delubac; Andreu Font-Ribera; Jean-Christophe Hamilton; Shirley Ho; Khee-Gan Lee; J. Legoff; D. Kirkby; Britt Lundgren; Brice Ménard; Jordi Miralda-Escudé; Nathalie Palanque-Delabrouille; Adam D. Myers; Isabelle Paris


AAS 219th Meeting | 2012

The 3D Clustering of BOSS DR9 Galaxies

A. Ross; Will J. Percival; Andreas A. Berlind; Michael R. Blanton; Adam S. Bolton; J. Brinkmann; L.A. Da Costa; Robert Crittenden; Antonio J. Cuesta; Daniel J. Eisenstein; Hong Guo; Jean-Christophe Hamilton; C. Hernández-Monteagudo; Shirley Ho; Eyal A. Kazin; Cameron K. McBride; M. A. G. Maia; Rachel Mandelbaum; Marc Manera; Claudia Maraston; Karen L. Masters; Francesco Montesano; Adam D. Myers; Robert C. Nichol; N. Padmanbhan; John Parejko; Francisco Prada; Beatriz H. F. Ramos; N. Ross; Idit Zehavi

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Donald P. Schneider

Pennsylvania State University

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