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

被引：85

作者：

Collister, Adrian

Lahav, Ofer

Blake, Chris

Cannon, Russell

Croom, Scott

Drinkwater, Michael

Edge, Alastair

Eisenstein, Daniel

Loveday, Jon

Nichol, Robert

Pimbblet, Kevin

De Propris, Roberto

Roseboom, Isaac

Ross, Nic

Schneider, Donald P.

Shanks, Tom

Wake, David

机构：

[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[2] UCL, Dept Phys & Astron, London WC1E 6BT, England

[3] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[4] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia

[5] Anglo Australian Observ, Epping, NSW 1710, Australia

[6] Univ Queensland, Dept Phys, Brisbane, Qld 4072, Australia

[7] Univ Durham, Dept Phys, Durham DH1 3LE, England

[8] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[9] Univ Sussex, Ctr Astron, Brighton BN1 9QJ, E Sussex, England

[10] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 2EG, Hants, England

[11] Cerro Tololo Interamer Observ, La Serena 603, Chile

[12] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2007年 / 375卷 / 01期

关键词：

catalogues; surveys; galaxies : distances and redshifts; cosmology : observations;

D O I：

10.1111/j.1365-2966.2006.11305.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：68 / 76

页数：9

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