THE SDSS-IV EXTENDED BARYON OSCILLATION SPECTROSCOPIC SURVEY: LUMINOUS RED GALAXY TARGET SELECTION

Abhishek Prakash, Timothy C. Licquia, Jeffrey A. Newman, Ashley J. Ross, Adam D. Myers, Kyle S. Dawson, Jean Paul Kneib, Will J. Percival, Julian E. Bautista, Johan Comparat, Jeremy L. Tinker, David J. Schlegel, Rita Tojeiro, Shirley Ho, Dustin Lang, Sandhya M. Rao, Cameron K. McBride, Guangtun Ben Zhu, Joel R. Brownstein, Stephen BaileyAdam S. Bolton, Timothée Delubac, Vivek Mariappan, Michael R. Blanton, Beth Reid, Donald P. Schneider, Hee Jong Seo, Aurelio Carnero Rosell, Francisco Prada

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We describe the algorithm used to select the luminous red galaxy (LRG) sample for the extended Baryon Oscillation Spectroscopic Survey (eBOSS) of the Sloan Digital Sky Survey IV (SDSS-IV) using photometric data from both the SDSS and the Wide-field Infrared Survey Explorer. LRG targets are required to meet a set of color selection criteria and have z-band and i-band MODEL magnitudes z < 19.95 and 19.9 < i < 21.8, respectively. Our algorithm selects roughly 50 LRG targets per square degree, the great majority of which lie in the redshift range 0.6 < z < 1.0 (median redshift 0.71). We demonstrate that our methods are highly effective at eliminating stellar contamination and lower-redshift galaxies. We perform a number of tests using spectroscopic data from SDSS-III/BOSS ancillary programs to determine the redshift reliability of our target selection and its ability to meet the science requirements of eBOSS. The SDSS spectra are of high enough signal-to-noise ratio that at least ∼89% of the target sample yields secure redshift measurements. We also present tests of the uniformity and homogeneity of the sample, demonstrating that it should be clean enough for studies of the large-scale structure of the universe at higher redshifts than SDSS-III/BOSS LRGs reached.

    Original languageEnglish (US)
    Article number34
    JournalAstrophysical Journal, Supplement Series
    Volume224
    Issue number2
    DOIs
    StatePublished - Jun 2016

    Keywords

    • Catalogs
    • Cosmology: observations
    • Galaxies: distances and redshifts
    • galaxies: general
    • galaxies: photometry
    • methods: data analysis

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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