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The SAMI Galaxy Survey: Stellar Populations of Passive Spiral Galaxies in Different Environments
The Astrophysical Journal ( IF 4.9 ) Pub Date : 2021-01-05 , DOI: 10.3847/1538-4357/abc880
Mina Pak 1, 2 , Sree Oh 3, 4 , Joon Hyeop Lee 1, 2 , Nicholas Scott 4, 5 , Rory Smith 1 , Jesse van de Sande 4, 5 , Scott M. Croom 4, 5 , Francesco D’Eugenio 6 , Kenji Bekki 7 , Sarah Brough 4, 8 , Caroline Foster 4, 5 , Tania M. Barone 3, 4, 5 , Katarina Kraljic 9 , Hyunjin Jeong 1 , Joss Bland-Hawthorn 5 , Julia J. Bryant 4, 5, 10 , Michael Goodwin 4, 5, 11 , Jon Lawrence 12 , Matt S. Owers 13, 14 , Samuel N. Richards 15
Affiliation  

We investigate the stellar populations of passive spiral galaxies as a function of mass and environment, using integral field spectroscopy data from the Sydney-AAO Multi-object Integral field spectrograph Galaxy Survey. Our sample consists of $52$ cluster passive spirals and $18$ group/field passive spirals, as well as a set of S0s used as a control sample. The age and [Z/H] estimated by measuring Lick absorption line strength indices both at the center and within $1R_{\rm e}$ do not show a significant difference between the cluster and the field/group passive spirals. However, the field/group passive spirals with log(M$_\star$/M$_\odot)\gtrsim10.5$ show decreasing [$\alpha$/Fe] along with stellar mass, which is $\sim0.1$ dex smaller than that of the cluster passive spirals. We also compare the stellar populations of passive spirals with S0s. In the clusters, we find that passive spirals show slightly younger age and lower [$\alpha$/Fe] than the S0s over the whole mass range. In the field/group, stellar populations show a similar trend between passive spirals and S0s. In particular, [$\alpha$/Fe] of the field/group S0s tend to be flattening with increasing mass above log(M$_\star$/M$_\odot)\gtrsim10.5$, similar to the field/group passive spirals. We relate the age and [$\alpha$/Fe] of passive spirals to their mean infall time in phase-space; we find a positive correlation, in agreement with the prediction of numerical simulations. We discuss the environmental processes that can explain the observed trends. The results lead us to conclude that the formation of the passive spirals and their transformation into S0s may significantly depend on their environments.

中文翻译:

SAMI 星系调查:不同环境中被动螺旋星系的恒星种群

我们使用来自悉尼-AAO 多目标积分场光谱仪星系调查的积分场光谱数据研究被动螺旋星系的恒星种群作为质量和环境的函数。我们的样本包括 52 美元的集群被动螺旋和 18 美元的组/场被动螺旋,以及一组用作对照样本的 S0。通过测量中心和 $1R_{\rm e}$ 内的 Lick 吸收线强度指数估计的年龄和 [Z/H] 没有显示星团和场/群被动螺旋之间的显着差异。然而,具有 log(M$_\star$/M$_\odot)\gtrsim10.5$ 的场/群被动螺旋显示 [$\alpha$/Fe] 随着恒星质量的减少,即 $\sim0。 1$ dex 比集群被动螺旋小。我们还将被动旋涡的恒星数量与 S0 进行了比较。在星团中,我们发现被动螺旋在整个质量范围内显示出比 S0 更年轻的年龄和更低的 [$\alpha$/Fe]。在场/群中,恒星群在被动旋涡和 S0 之间显示出类似的趋势。特别是,场/组 S0 的 [$\alpha$/Fe] 趋向于在 log(M$_\star$/M$_\odot)\gtrsim10.5$ 以上随着质量增加而变平,类似于场/group 被动螺旋。我们将被动螺旋的年龄和 [$\alpha$/Fe] 与它们在相空间中的平均下降时间联系起来;我们发现正相关,与数值模拟的预测一致。我们讨论可以解释观察到的趋势的环境过程。结果使我们得出结论,被动螺旋的形成及其向 S0 的转变可能在很大程度上取决于它们的环境。我们发现被动螺旋在整个质量范围内显示出比 S0 更年轻的年龄和更低的 [$\alpha$/Fe]。在场/群中,恒星群在被动旋涡和 S0 之间显示出类似的趋势。特别是,场/组 S0 的 [$\alpha$/Fe] 趋于在 log(M$_\star$/M$_\odot)\gtrsim10.5$ 以上随着质量的增加而变平,类似于场/group 被动螺旋。我们将被动螺旋的年龄和 [$\alpha$/Fe] 与它们在相空间中的平均下降时间联系起来;我们发现正相关,与数值模拟的预测一致。我们讨论可以解释观察到的趋势的环境过程。结果使我们得出结论,被动螺旋的形成及其向 S0 的转变可能在很大程度上取决于它们的环境。我们发现被动螺旋在整个质量范围内显示出比 S0 更年轻的年龄和更低的 [$\alpha$/Fe]。在场/群中,恒星群在被动旋涡和 S0 之间显示出类似的趋势。特别是,场/组 S0 的 [$\alpha$/Fe] 趋向于在 log(M$_\star$/M$_\odot)\gtrsim10.5$ 以上随着质量增加而变平,类似于场/group 被动螺旋。我们将被动螺旋的年龄和 [$\alpha$/Fe] 与它们在相空间中的平均下降时间联系起来;我们发现正相关,与数值模拟的预测一致。我们讨论可以解释观察到的趋势的环境过程。结果使我们得出结论,被动螺旋的形成及其向 S0 的转变可能在很大程度上取决于它们的环境。
更新日期:2021-01-05
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