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The Dark Matter Haloes and Host Galaxies of MgII Absorbers at z~1 | Britt Lundgren
; David Wake
; Nikhil Padmanabhan
; Alison Coil
; Donald York
; | Date: |
8 Jun 2011 | Abstract: | Strong foreground absorption features from singly-ionized Magnesium (Mg II)
are commonly observed in the spectra of quasars and are presumed to probe a
wide range of galactic environments. To date, measurements of the average dark
matter halo masses of intervening Mg II absorbers by way of large-scale
cross-correlations with luminous galaxies have been limited to z<0.7. In this
work we cross-correlate 21 strong (W{lambda}2796>0.6 {deg}A) Mg II absorption
systems detected in quasar spectra from the Sloan Digital Sky Survey Data
Release 7 with ~32,000 spectroscopically confirmed galaxies at 0.7<z<1.45 from
the DEEP2 galaxy redshift survey. We measure dark matter (DM) halo biases of
b_G=1.44pm0.02 and b_A=1.49pm0.45 for the DEEP2 galaxies and Mg II absorbers,
respectively, indicating that their clustering amplitudes are roughly
consistent. Haloes with the bias we measure for the Mg II absorbers have a
corresponding mass of 1.8(+4.2/-1.6) imes 10^12h-1M_sun, although the actual
mean absorber halo mass will depend on the precise distribution of absorbers
within DM haloes. This mass estimate is consistent with observations at z=0.6,
suggesting that the halo masses of typical Mg II absorbers do not significantly
evolve from z~1. We additionally measure the average W{lambda}2796>0.6 AA gas
covering fraction to be f =0.5 within 60 h-1kpc around the DEEP2 galaxies, and
we find an absence of coincident strong Mg II absorption beyond a projected
separation of ~40 h-1kpc. Although the star-forming z>1 DEEP2 galaxies are
known to exhibit ubiquitous blueshifted Mg II absorption, we find no direct
evidence in our small sample linking W{lambda}2796>0.6 AA absorbers to
galaxies with ongoing star formation. | Source: | arXiv, 1106.1642 | Services: | Forum | Review | PDF | Favorites |
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