|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'928
Articles rated: 2609
25 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
The SDSS-III Baryon Oscillation Spectroscopic Survey: Quasar Target Selection for Data Release Nine | | Nicholas P. Ross
; Adam D. Myers
; Erin S. Sheldon
; Christophe Yèche
; Michael A. Strauss
; Jo Bovy
; Jessica A. Kirkpatrick
; Gordon T. Richards
; Eric Aubourg
; Michael R. Blanton
; W. N. Brandt
; William C. Carithers
; Rupert A.C. Croft
; Robert da Silva
; Kyle Dawson
; Daniel J. Eisenstein
; Joseph F. Hennawi
; Shirley Ho
; David W. Hogg
; Khee-Gan Lee
; Britt Lundgren
; Richard G. McMahon
; Jordi Miralda-Escude
; Nathalie Palanque-Delabrouille
; Isabelle Paris
; Patrick Petitjean
; Matthew M. Pieri
; James Rich
; Natalie A. Roe
; David Schiminovich
; David J. Schlegel
; Donald P. Schneider
; Anže Slosar
; Nao Suzuki
; Jeremy L. Tinker
; David H. Weinberg
; Anya Weyant
; Martin White
; W. Michael Wood-Vasey
; | | Date: |
3 May 2011 | | Abstract: | The SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS), a five-year
spectroscopic survey of 10,000 deg^2, achieved first light in late 2009. One of
the key goals of BOSS is to measure the signature of baryon acoustic
oscillations in the distribution of Ly-alpha absorption from the spectra of a
sample of ~150,000 z>2.2 quasars. Along with measuring the angular diameter
distance at zapprox2.5, BOSS will provide the first direct measurement of the
expansion rate of the Universe at z > 2. One of the biggest challenges in
achieving this goal is an efficient target selection algorithm for quasars over
2.2 < z < 3.5, where their colors overlap those of stars. During the first year
of the BOSS survey, quasar target selection methods were developed and tested
to meet the requirement of delivering at least 15 quasars deg^-2 in this
redshift range, out of 40 targets deg^-2. To achieve these surface densities,
the magnitude limit of the quasar targets was set at g <= 22.0 or r<=21.85.
While detection of the BAO signature in the Ly-alpha absorption in quasar
spectra does not require a uniform target selection, many other astrophysical
studies do. We therefore defined a uniformly-selected subsample of 20 targets
deg^-2, for which the selection efficiency is just over 50%. This "CORE"
subsample will be fixed for Years Two through Five of the survey. In this paper
we describe the evolution and implementation of the BOSS quasar target
selection algorithms during the first two years of BOSS operations. We analyze
the spectra obtained during the first year. 11,263 new z>2.2 quasars were
spectroscopically confirmed by BOSS. Our current algorithms select an average
of 15 z > 2.2 quasars deg^-2 from 40 targets deg^-2 using single-epoch SDSS
imaging. Multi-epoch optical data and data at other wavelengths can further
improve the efficiency and completeness of BOSS quasar target selection.
[Abridged] | | Source: | arXiv, 1105.0606 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER