论文标题
缪斯气流和风（巨型流）
MusE GAs FLOw and Wind (MEGAFLOW) V. The dust/metallicity-anisotropy of the Circum-Galactic Medium
论文作者
论文摘要
我们研究了圆周 - 半乳酸培养基（CGM）的灰尘含量是否取决于使用13个Galaxy-MGII吸收器对（9-81 kpc距离）在0.4 <z <z <1.4时，使用13个Galaxy-MGII吸收器对（9-81 kpc距离）在GALAXY-MGII吸收对（9-81 kpc距离）中是否取决于星系大轴的位置。 CGM的灰尘含量是使用紫外线和视觉梯形光谱仪（UVE）数据从[Zn/Fe]获得的。当无法获得[Zn/Fe]的直接测量，我们估算了一种方法，该方法是从多种单一离子离子（例如MNII，CRII，ZNII，ZNII）求解的方法中的粉尘耗竭，因为每个离子耗尽了粉尘粒，以不同的速率。我们发现方位角角与[Zn/fe]之间的正相关，pearson的r = 0.70 +/- 0.14。沿主要轴的视线显示[Zn/Fe] <0.5，而[Zn/Fe]沿次要轴> 0.8。这些结果表明，沿次要轴的CGM平均比沿着主要星系的主要轴的气体更丰富的金属富集（降低1个），前提是粉尘耗竭是金属性的代理。这种各向异性分布与动力模拟中流出和积聚的最新结果一致。
We investigate whether the dust content of the circum-galactic medium (CGM) depends on the location of the quasar sightline with respect to the galaxy major-axis using 13 galaxy-MgII absorber pairs (9 - 81 kpc distance) from the MusE GAs FLOw and Wind (MEGAFLOW) survey at 0.4 < z < 1.4. The dust content of the CGM is obtained from [Zn/Fe] using Ultraviolet and Visual Echelle Spectrograph (UVES) data. When a direct measurement of [Zn/Fe] is unavailable, we estimate the dust depletion from a method which consists in solving for the depletion from multiple singly ionized ions (e.g. MnII, CrII, ZnII) since each ion depletes on dust grains at different rates. We find a positive correlation between the azimuthal angle and [Zn/Fe] with a Pearson's r = 0.70 +/- 0.14. The sightlines along the major axis show [Zn/Fe] < 0.5, whereas the [Zn/Fe] is > 0.8 along the minor axis. These results suggest that the CGM along the minor axis is on average more metal enriched (by ~ 1 dex) than the gas located along the major axis of galaxies provided that dust depletion is a proxy for metallicity. This anisotropic distribution is consistent with recent results on outflow and accretion in hydro-dynamical simulations.
