Artículo de revista
MODERATE Civ ABSORBER SYSTEMS REQUIRE 1012M
Fecha
2013Registro en:
The Astrophysical Journal, 768:38 (14pp), 2013
doi:10.1088/0004-637X/768/1/38
Autor
Vikas, Shailendra
Wood-Vasey, W. Michael
Lundgren, Britt
Britt, Nicholas P.
Myers, Adam D.
AlSayyad, Yusra
York, Donald G.
Schneider, Donald P.
Brinkmann, J.
Bizyaev, Dmitry
Brewington, Howard
Ge, Jian
Malanushenko, Elena
Malanushenko, Viktor
Muna, Demitri
Oravetz, Daniel
Pan, Kaike
Paris, Isabelle
Petitjean, Patrick
Snedden, Stephanie
Shelden, Alaina
Simmons, Audrey
Weaver, Benjamin A.
Institución
Resumen
We measure the two-point cross-correlation function of C iv absorber systems and quasars, using spectroscopic
data from the Sloan Digital Sky Survey III Baryon Oscillation Spectroscopic Survey (BOSS; Data Release 9). The
19,701 quasars and 6149 Civ “moderate” absorbers, 0.28Å<rest-frame equivalent width (EW)<5Å, in our study
cover a redshift range of 2.1 < z < 2.5 over 3300 deg2 and represent a factor of two increase in sample size over
previous investigations.We find a correlation scale length and slope of the redshift-space cross-correlation function
of s0 = 8.46 ± 1.24 Mpc, γ = 1.68 ± 0.19, in the redshift-space range 10 < s < 100 Mpc. We find a projected
cross-correlation function of C iv absorption systems and quasars of r0 = 7.76 ± 2.80 Mpc, γ = 1.74 ± 0.21. We
measure the combined quasar and C iv bias to be bQSObCiv = 8.81 ± 2.28. Using an estimate of bQSO from the
quasar auto-correlation function we find bCiv = 2.38 ± 0.62. This bC iv implies that EW > 0.28Å C iv absorbers
at z ∼ 2.3 are typically found in dark matter halos that have masses 1011.3–1013.4M at that redshift. The
complete BOSS sample will triple the number of both quasars and absorption systems and increase the power of
this cross-correlation measurement by a factor of two.