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不同颜色、质量和环境的0.5 < z < 0.9 zCOSMOS星系周围Mg II吸收的径向和方位角分布

The radial and azimuthal profiles of Mg II absorption around 0.5 < z < 0.9 zCOSMOS galaxies of different colors, masses and environments

R. Bordoloi, S. J. Lilly, C. Knobel, M. Bolzonella, P. Kampczyk, C. M. Carollo, A. Iovino, E. Zucca, T. Contini, J. -P. Kneib, O. Le Fevre, V. Mainieri, A. Renz… 展开作者

R. Bordoloi, S. J. Lilly, C. Knobel, M. Bolzonella, P. Kampczyk, C. M. Carollo, A. Iovino, E. Zucca, T. Contini, J. -P. Kneib, O. Le Fevre, V. Mainieri, A. Renzini, M. Scodeggio, G. Zamorani, I. Balestra, S. Bardelli, A. Bongiorno, K. Caputi, O. Cucciati, S. de la Torre, L. de Ravel, B. Garilli, K. Kovac, F. Lamareille, J. -F. Le Borgne, V. Le Brun, C. Maier, M. Mignoli, R. Pello, Y. Peng, E. Perez Montero, V. Presotto, C. Scarlata, J. Silverman, M. Tanaka, L. Tasca, L. Tresse, D. Vergani, L. Barnes, A. Cappi, A. Cimatti, G. Coppa, C. Diener, P. Franzetti, A. Koekemoer, C. Lopez-Sanjuan, H. J. McCracken, M. Moresco, P. Nair, P. Oesch, L. Pozzetti, N. Welikala

备注：
14 pages, Accepted for publication in ApJ; new section on inclination dependence added; Figure 4:- new panel added
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摘要：

我们映射的径向和方位角分布的Mg II气体在200千秒差距（物理）的4000星系在红移0.5 &lt; z < 0.9 using co-added spectra of more than 5000 background galaxies at z >1。我们调查的Mg II静止框架等效宽度的径向碰撞参量的功能的不同子集的前景星系选择在其静止框架的颜色和质量的变化。蓝色星系有一个显着更高的平均镁II等效宽度在接近银河中心半径相比，红色星系。在蓝色星系中，Mg II等效宽度和宿主星系的星系恒星质量之间存在相关性。我们还发现，Mg II吸收周围的群星系的分布是更广泛的非群星系，作为一个整体的群体有更多的扩展比个别星系的径向配置文件。有趣的是，这些影响可以令人满意地模拟一个简单的叠加的吸收个人成员星系，假设这些是相同的非组星系，这表明集团环境可能不会显着增强或减少个别星系的Mg II吸收。我们发现，有一个很强的方位角依赖性的Mg II吸收在50千秒差距的倾斜盘为主的星系，表明存在一个强烈的双极流出沿磁盘旋转轴对齐。Mg II的吸收对盘状星系的视倾角没有明显的依赖性。

英文摘要：

We map the radial and azimuthal distribution of Mg II gas within 200 kpc (physical) of 4000 galaxies at redshifts 0.5 < z < 0.9 using co-added spectra of more than 5000 background galaxies at z > 1. We investigate the variation of Mg II rest frame equivalent width as a function of the radial impact parameter for different subsets of foreground galaxies selected in terms of their rest-frame colors and masses. Blue galaxies have a significantly higher average Mg II equivalent width at close galactocentric radii as compared to the red galaxies. Amongst the blue galaxies, there is a correlation between Mg II equivalent width and galactic stellar mass of the host galaxy. We also find that the distribution of Mg II absorption around group galaxies is more extended than that for non-group galaxies, and that groups as a whole have more extended radial profiles than individual galaxies. Interestingly, these effects can be satisfactorily modeled by a simple superposition of the absorption profiles of individual member galaxies, assuming that these are the same as those of non-group galaxies, suggesting that the group environment may not significantly enhance or diminish the Mg II absorption of individual galaxies. We show that there is a strong azimuthal dependence of the Mg II absorption within 50 kpc of inclined disk-dominated galaxies, indicating the presence of a strongly bipolar outflow aligned along the disk rotation axis. There is no significant dependence of Mg II absorption on the apparent inclination angle of disk-dominated galaxies.

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