N. Ross
Durham University
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Monthly Notices of the Royal Astronomical Society | 2007
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
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
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
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
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
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
Fred Hamann; Nadia L. Zakamska; Isabelle Paris; H. Herbst; C. Villforth; Rachael Alexandroff; N. Ross; Jenny E. Greene; Michael A. Strauss
Archive | 2013
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
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
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