%0 Generic %1 gauthier2013masses %A Gauthier, Jean-Rene %A Chen, Hsiao-Wen %A Cooksey, Kathy L. %A Simcoe, Robert A. %A Seyffert, Eduardo N. %A O'Meara, John M. %D 2013 %K absorption halo mass mgII %T Halo Masses of MgII absorbers at z0.5 from SDSS DR7 %U http://arxiv.org/abs/1312.4593 %X We present the cross-correlation function of MgII absorbers with respect to a volume-limited sample of luminous red galaxies (LRGs) at z=0.45-0.60 using the largest MgII absorber sample and a new LRG sample from SDSS DR7. We present the clustering signal of absorbers on projected scales r_p = 0.3-35 Mpc/h in four Wr(2796) bins spanning Wr(2796)=0.4-5.6A. We found that on average MgII absorbers reside in halos < log M_h > 12.1, similar to the halo mass of an L_* galaxy. We report that the weakest absorbers in our sample with W_r(2796)=0.4-1.1A reside in relatively massive halos with < log M_h > \approx 12.5^+0.6_-1.3, while stronger absorbers reside in halos of similar or lower masses < log M_h > 11.6^+0.9. We compared our bias data points, b, and the frequency distribution function of absorbers, f_W_r, with a simple model incorporating an isothermal density profile to mimic the distribution of absorbing gas in halos. We also compared the bias data points with Tinker & Chen (2008) who developed halo occupation distribution models of MgII absorbers that are constrained by b and f_W_r. The simple isothermal model can be ruled at a 2.8level mostly because of its inability to reproduce f_W_r. However, b values are consistent with both models, including TC08. In addition, we show that the mean b of absorbers does not decrease beyond W_r(2796) 1.6A. The flat or potential upturn of b for Wr(2796) \gtrsim 1.6A absorbers suggests the presence of additional cool gas in massive halos.

@misc{gauthier2013masses, abstract = {We present the cross-correlation function of MgII absorbers with respect to a volume-limited sample of luminous red galaxies (LRGs) at z=0.45-0.60 using the largest MgII absorber sample and a new LRG sample from SDSS DR7. We present the clustering signal of absorbers on projected scales r_p = 0.3-35 Mpc/h in four Wr(2796) bins spanning Wr(2796)=0.4-5.6A. We found that on average MgII absorbers reside in halos < log M_h > \approx 12.1, similar to the halo mass of an L_* galaxy. We report that the weakest absorbers in our sample with W_r(2796)=0.4-1.1A reside in relatively massive halos with < log M_h > \approx 12.5^{+0.6}_{-1.3}, while stronger absorbers reside in halos of similar or lower masses < log M_h > \approx 11.6^{+0.9}. We compared our bias data points, b, and the frequency distribution function of absorbers, f_{W_r}, with a simple model incorporating an isothermal density profile to mimic the distribution of absorbing gas in halos. We also compared the bias data points with Tinker & Chen (2008) who developed halo occupation distribution models of MgII absorbers that are constrained by b and f_{W_r}. The simple isothermal model can be ruled at a \approx 2.8\sigma level mostly because of its inability to reproduce f_{W_r}. However, b values are consistent with both models, including TC08. In addition, we show that the mean b of absorbers does not decrease beyond W_r(2796) \approx 1.6A. The flat or potential upturn of b for Wr(2796) \gtrsim 1.6A absorbers suggests the presence of additional cool gas in massive halos.}, added-at = {2013-12-18T09:05:36.000+0100}, author = {Gauthier, Jean-Rene and Chen, Hsiao-Wen and Cooksey, Kathy L. and Simcoe, Robert A. and Seyffert, Eduardo N. and O'Meara, John M.}, biburl = {https://www.bibsonomy.org/bibtex/245231c4bd7efe76cf02db18116a78509/miki}, description = {[1312.4593] Halo Masses of MgII absorbers at z\sim 0.5 from SDSS DR7}, interhash = {211610d5fbc85e8af74b671320b31c97}, intrahash = {45231c4bd7efe76cf02db18116a78509}, keywords = {absorption halo mass mgII}, note = {cite arxiv:1312.4593Comment: 13 pages, 6 figures. Accepted for publication in MNRAS}, timestamp = {2013-12-18T09:05:36.000+0100}, title = {Halo Masses of MgII absorbers at z\sim 0.5 from SDSS DR7}, url = {http://arxiv.org/abs/1312.4593}, year = 2013 }