SPECTRAL CLASSIFICATION AND REDSHIFT MEASUREMENT FOR THE SDSS-III BARYON OSCILLATION SPECTROSCOPIC SURVEY

被引：420

作者：

Bolton, Adam S. ^{[1
]}

Schlegel, David J. ^{[2
]}

Aubourg, Eric ^{[3
,4
]}

Bailey, Stephen ^{[2
]}

Bhardwaj, Vaishali ^{[5
]}

Brownstein, Joel R. ^{[1
]}

Burles, Scott ^{[6
]}

Chen, Yan-Mei ^{[7
]}

Dawson, Kyle ^{[1
]}

Eisenstein, Daniel J. ^{[8
]}

Gunn, James E. ^{[9
]}

Knapp, G. R. ^{[9
]}

Loomis, Craig P. ^{[9
]}

Lupton, Robert H. ^{[9
]}

Maraston, Claudia ^{[10
]}

Muna, Demitri ^{[11
]}

Myers, Adam D. ^{[12
]}

Olmstead, Matthew D. ^{[1
]}

Padmanabhan, Nikhil ^{[13
]}

Paris, Isabelle ^{[14
,15
]}

Percival, Will J. ^{[10
]}

Petitjean, Patrick ^{[14
]}

Rockosi, Constance M. ^{[16
]}

Ross, Nicholas P. ^{[2
]}

Schneider, Donald P. ^{[17
,18
,19
]}

Shu, Yiping ^{[1
]}

Strauss, Michael A. ^{[9
]}

Thomas, Daniel ^{[10
]}

Tremonti, Christy A. ^{[7
]}

Wake, David A. ^{[20
]}

Weaver, Benjamin A. ^{[11
]}

Wood-Vasey, W. Michael ^{[21
]}

机构：

[1] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[3] Univ Paris Diderot, Astroparticule & Cosmol APC, F-75205 Paris 13, France

[4] CEA, Ctr Saclay, Irfu SPP, F-91191 Gif Sur Yvette, France

[5] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[6] Cutler Grp LP, San Francisco, CA 94104 USA

[7] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA

[8] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[9] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[10] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England

[11] NYU, Ctr Cosmol & Particle Phys, New York, NY 10003 USA

[12] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA

[13] Yale Univ, Dept Phys, New Haven, CT 06520 USA

[14] UPMC, CNRS, Inst Astrophys Paris, UMR7095, F-75014 Paris, France

[15] Univ Chile, Dept Astron, Santiago, Chile

[16] Univ Calif Santa Cruz, UCO Lick Observ, Santa Cruz, CA 95064 USA

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

[18] Penn State Univ, Inst Gravitat, University Pk, PA 16802 USA

[19] Penn State Univ, Cosmos, University Pk, PA 16802 USA

[20] Yale Univ, Dept Astron, New Haven, CT 06520 USA

[21] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA

来源：

ASTRONOMICAL JOURNAL | 2012年 / 144卷 / 05期

关键词：

methods: data analysis; surveys; techniques: spectroscopic; DIGITAL SKY SURVEY; STAR-FORMING GALAXIES; DATA RELEASE; TARGET SELECTION; LINE SPECTRA; EMISSION; LIBRARY; I; EXTRACTION; TELESCOPE;

D O I：

10.1088/0004-6256/144/5/144

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe the automated spectral classification, redshift determination, and parameter measurement pipeline in use for the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey III (SDSS-III) as of the survey's ninth data release (DR9), encompassing 831,000 moderate-resolution optical spectra. We give a review of the algorithms employed, and describe the changes to the pipeline that have been implemented for BOSS relative to previous SDSS-I/II versions, including new sets of stellar, galaxy, and quasar redshift templates. For the color-selected "CMASS" sample of massive galaxies at redshift 0.4 less than or similar to z <= 0.8 targeted by BOSS for the purposes of large-scale cosmological measurements, the pipeline achieves an automated classification success rate of 98.7% and confirms 95.4% of unique CMASS targets as galaxies (with the balance being mostly M stars). Based on visual inspections of a subset of BOSS galaxies, we find that approximately 0.2% of confidently reported CMASS sample classifications and redshifts are incorrect, and about 0.4% of all CMASS spectra are objects unclassified by the current algorithm which are potentially recoverable. The BOSS pipeline confirms that similar to 51.5% of the quasar targets have quasar spectra, with the balance mainly consisting of stars and low signal-to-noise spectra. Statistical (as opposed to systematic) redshift errors propagated from photon noise are typically a few tens of km s(-1) for both galaxies and quasars, with a significant tail to a few hundreds of km s(-1) for quasars. We test the accuracy of these statistical redshift error estimates using repeat observations, finding them underestimated by a factor of 1.19-1.34 for galaxies and by a factor of two for quasars. We assess the impact of sky-subtraction quality, signal-to-noise ratio, and other factors on galaxy redshift success. Finally, we document known issues with the BOSS DR9 spectroscopic data set and describe directions of ongoing development.

引用

页数：20

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