NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-09-22 T08:02:56 PDT
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For refcode 2013AJ....145...69L:
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2013AJ....145...69L The BOSS Ly-{alpha} Forest Sample from SDSS Data Release 9 Lee, Khee-Gan; Bailey, Stephen; Bartsch, Leslie E.; Carithers, William; Dawson, Kyle S.; Kirkby, David; Lundgren, Britt; Margala, Daniel; Palanque-Delabrouille, Nathalie; Pieri, Matthew M.; Schlegel, David J.; Weinberg, David H.; Yeche, Christophe; Aubourg, Eric; Bautista, Julian; Bizyaev, Dmitry; Blomqvist, Michael; Bolton, Adam S.; Borde, Arnaud; Brewington, Howard; Busca, Nicolas G.; Croft, Rupert A. C.; Delubac, Timothee; Ebelke, Garrett; Eisenstein, Daniel J.; Font-Ribera, Andreu; Ge, Jian; Hamilton, Jean-Christophe; Hennawi, Joseph F.; Ho, Shirley; Honscheid, Klaus; Le Goff, Jean-Marc; Malanushenko, Elena; Malanushenko, Viktor; Miralda-Escude, Jordi; Myers, Adam D.; Noterdaeme, Pasquier; Oravetz, Daniel; Pan, Kaike; Paris, Isabelle; Petitjean, Patrick; Rich, James; Rollinde, Emmanuel; Ross, Nicholas P.; Rossi, Graziano; Schneider, Donald P.; Simmons, Audrey; Snedden, Stephanie; Slosar, Anze; Spergel, David N.; Suzuki, Nao; Viel, Matteo; Weaver, Benjamin A. Abstract. We present the BOSS Lyman-{alpha} (Ly-{alpha}) Forest Sample from SDSS Data Release 9, comprising 54,468 quasar spectra with z_qso_ > 2.15 suitable for Ly-{alpha} forest analysis. This data set probes the intergalactic medium with absorption redshifts 2.0 < z_{alpha}_ < 5.7 over an area of 3275 deg^2^, and encompasses an approximate comoving volume of 20 h ^--3^ Gpc^3^. With each spectrum, we have included several products designed to aid in Ly-{alpha} forest analysis: improved sky masks that flag pixels where data may be unreliable, corrections for known biases in the pipeline estimated noise, masks for the cores of damped Ly-{alpha} systems and corrections for their wings, and estimates of the unabsorbed continua so that the observed flux can be converted to a fractional transmission. The continua are derived using a principal component fit to the quasar spectrum redward of rest-frame Ly-{alpha} (lambda > 1216 A), extrapolated into the forest region and normalized by a linear function to fit the expected evolution of the Ly-{alpha} forest mean flux. The estimated continuum errors are <~ 5% rms. We also discuss possible systematics arising from uncertain spectrophotometry and artifacts in the flux calibration; global corrections for the latter are provided. Our sample provides a convenient starting point for users to analyze clustering in BOSS Ly-{alpha} forest data, and it provides a fiducial data set that can be used to compare results from different analyses of baryon acoustic oscillations in the Ly-{alpha} forest. The full data set is available from the SDSS-III DR9 Web site. Key words: intergalactic medium, methods: data analysis, quasars: absorption lines, quasars: emission lines
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