%0 Generic %1 Lundgren2011 %A Lundgren, Britt %A Wake, David %A Padmanabhan, Nikhil %A Coil, Alison %A York, Donald %D 2011 %K correlation function mgII %T The Dark Matter Haloes and Host Galaxies of MgII Absorbers at z~1 %U http://arxiv.org/abs/1106.1642 %X 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 (Włambda2796>0.6 \degA) 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=1.44\pm0.02 and b_A=1.49\pm0.45 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) 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 Włambda2796>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 Włambda2796>0.6 \AA absorbers to galaxies with ongoing star formation.

@misc{Lundgren2011, 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=1.44\pm0.02 and b_A=1.49\pm0.45 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) \times 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. }, added-at = {2011-06-11T14:03:02.000+0200}, author = {Lundgren, Britt and Wake, David and Padmanabhan, Nikhil and Coil, Alison and York, Donald}, biburl = {https://www.bibsonomy.org/bibtex/28cc65d14c3684ad0696702b1ba05d205/miki}, description = {[1106.1642] The Dark Matter Haloes and Host Galaxies of MgII Absorbers at z~1}, interhash = {45bf250de93ab3f03651e652dfca9961}, intrahash = {8cc65d14c3684ad0696702b1ba05d205}, keywords = {correlation function mgII}, note = {cite arxiv:1106.1642Comment: 12 pages, 5 figures, Accepted to MNRAS}, timestamp = {2011-06-11T14:03:02.000+0200}, title = {The Dark Matter Haloes and Host Galaxies of MgII Absorbers at z~1}, url = {http://arxiv.org/abs/1106.1642}, year = 2011 }