Journal
ASTRONOMICAL JOURNAL
Volume 145, Issue 3, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0004-6256/145/3/69
Keywords
intergalactic medium; methods: data analysis; quasars: absorption lines; quasars: emission lines
Categories
Funding
- European Union [PIIF-GA-2011-301665]
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy Office of Science
- University of Arizona
- Brazilian Participation Group
- Brookhaven National Laboratory
- University of Cambridge
- Carnegie Mellon University
- University of Florida
- French Participation Group
- German Participation Group
- Harvard University
- Instituto de Astrofisica de Canarias
- Michigan State/Notre Dame/JINA Participation Group
- Johns Hopkins University
- Lawrence Berkeley National Laboratory
- Max Planck Institute for Astrophysics
- Max Planck Institute for Extraterrestrial Physics
- New Mexico State University
- New York University
- Ohio State University
- Pennsylvania State University
- University of Portsmouth
- Princeton University
- Spanish Participation Group, University of Tokyo
- University of Utah
- Vanderbilt University
- University of Virginia
- University of Washington
- Yale University
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1109730] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1202963] Funding Source: National Science Foundation
- ICREA Funding Source: Custom
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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 angstrom), 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 less than or similar to 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.
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