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arXiv 1609.01299astro-ph.GA
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SDSS-IV MaNGA:微弱淬灭星系I-环境淬灭的样品选择和证据

SDSS-IV MaNGA: Faint quenched galaxies I- Sample selection and evidence for environmental quenching

Samantha J. Penny, Karen L. Masters, Anne-Marie Weijmans, Kyle B. Westfall, Matthew A. Bershady, Kevin Bundy, Niv Drory, Jesús Falcón-Barroso, David Law, Robert… 展开作者

Samantha J. Penny, Karen L. Masters, Anne-Marie Weijmans, Kyle B. Westfall, Matthew A. Bershady, Kevin Bundy, Niv Drory, Jesús Falcón-Barroso, David Law, Robert C. Nichol, Daniel Thomas, Dmitry Bizyaev, Joel R. Brownstein, Gordon Freischlad, Patrick Gaulme, Katie Grabowski, Karen Kinemuchi, Elena Malanushenko, Viktor Malanushenko, Daniel Oravetz, Alexandre Roman-Lopes, Kaike Pan, Audrey Simmons, David A. Wake

摘要:

使用运动学地图从斯隆数字巡天(SDSS)映射附近的Galerkin在阿帕奇点天文台(MANGA)的调查,我们发现,大多数低质量淬火星系表现出相干旋转的恒星运动学。我们的样本包括在MaNGA的第一年观察到的所有39个淬灭的低质量星系。这些星系被选定为$M_{r} > -19.1$,恒星质量为$10^{9}$ M $_{\odot} < M_{\star} < 5\times10^{9}$ M $_{\odot}$,EW $_{Hα} <2$,并且都有红色$(u-r)>1.9$。它们依赖于以前研究过的矮星系的大小-星等和$σ$ -光度关系。只有六个($15\pm5.7$百分之)被发现有旋转速度$v_{e,rot} < 15$ km s $^{-1}$在$\sim1$ $R_{e}$,并可能占主导地位的压力支持在所有半径。在我们的样本中,两个星系的恒星组成部分具有运动学上不同的核心,可能是吸积的结果。其中六个包含电离气体,尽管没有正在进行的恒星形成,这种气体通常与它们的恒星成分运动学上不一致。这是第一个大规模的积分场单位(IFU)的低质量星系的研究选择没有偏见的低密度环境。然而,我们发现这些星系的大多数是在$\sim1.5$ Mpc的一个明亮的邻居($M_{K} < -23$ ;或M $_{\star} > 5\times10^{10}$ M $_{\odot}$),支持假说,即星系星系或星系群相互作用淬火低质量星系的恒星形成。我们的样本的局部明亮星系密度为$ρ_{proj} = 8.2\pm2.0$ Mpc $^{-2}$,相比之下,恒星形成比较样本的$ρ_{proj} = 2.1\pm0.4$ Mpc $^{-2}$,证实了淬火的低质量星系优先在较高密度的环境中发现。

英文摘要:

Using kinematic maps from the Sloan Digital Sky Survey (SDSS) Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, we reveal that the majority of low-mass quenched galaxies exhibit coherent rotation in their stellar kinematics. Our sample includes all 39 quenched low-mass galaxies observed in the first year of MaNGA. The galaxies are selected with $M_{r} > -19.1$, stellar masses $10^{9}$ M$_{\odot} < M_{\star} < 5\times10^{9}$ M$_{\odot}$, EW$_{Hα} <2$ Å, and all have red colours $(u-r)>1.9$. They lie on the size-magnitude and $σ$-luminosity relations for previously studied dwarf galaxies. Just six ($15\pm5.7$ per cent) are found to have rotation speeds $v_{e,rot} < 15$ km s$^{-1}$ at $\sim1$ $R_{e}$, and may be dominated by pressure support at all radii. Two galaxies in our sample have kinematically distinct cores in their stellar component, likely the result of accretion. Six contain ionised gas despite not hosting ongoing star formation, and this gas is typically kinematically misaligned from their stellar component. This is the first large-scale Integral Field Unit (IFU) study of low mass galaxies selected without bias against low-density environments. Nevertheless, we find the majority of these galaxies are within $\sim1.5$ Mpc of a bright neighbour ($M_{K} < -23$; or M$_{\star} > 5\times10^{10}$ M$_{\odot}$), supporting the hypothesis that galaxy-galaxy or galaxy-group interactions quench star formation in low-mass galaxies. The local bright galaxy density for our sample is $ρ_{proj} = 8.2\pm2.0$ Mpc$^{-2}$, compared to $ρ_{proj} = 2.1\pm0.4$ Mpc$^{-2}$ for a star forming comparison sample, confirming that the quenched low mass galaxies are preferentially found in higher density environments.

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