arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.01658astro-ph.GA
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SDSS-IV MaNGA中的星暴后Galerkin

Post-Starburst Galaxies in SDSS-IV MaNGA

Yan-Mei Chen, Yong Shi, Vivienne Wild, Christy Tremonti, Kate Rowlands, Dmitry Bizyaev, Renbin Yan, Lihwai Lin, Rogério Riffel

摘要:

星暴后的星系,通过其异常强的巴耳末吸收线和弱于平均水平的发射线来识别,传统上是根据它们的中心恒星星族来选择的。在这里,我们确定了360个星系的后星暴区的MaNGA积分场调查,并将这些星系分为三种类型:31个星系的中心后星暴区(CPSB),37个星系的偏心环状后星暴区(RPSB)和292个星系的不规则后星暴区(IPSB)。重点研究了CPSB和RPSB样品,并比较了它们在D $_n$ 4000、H $δ_{\rm A}$和W(H $α$)与对照样本相比,我们发现,虽然CPSB在其整个凸起和盘上抑制了恒星形成,并且有明显的证据表明中心区域的恒星形成迅速下降,RPSB只显示了最近在其外部区域快速抑制恒星形成和正在进行的中央恒星爆发的明确证据。质量加权年龄和恒星$v/σ$的径向分布表明,CPSB和RPSB不是简单的同一事件的不同演化阶段,而是CPSB星系是由一个重大的破坏性事件,而RPSB星系是由破坏气体燃料的外部区域。与对照样品相比,CPSB和RPSB星系都显示出更高比例的相互作用/合并,未对准的气体或酒吧,这可能是气体流入和随后的淬火的原因。

英文摘要:

Post-starburst galaxies, identified by their unusually strong Balmer absorption lines and weaker than average emission lines, have traditionally been selected based on their central stellar populations. Here we identify 360 galaxies with post-starburst regions from the MaNGA integral field survey and classify these galaxies into three types: 31 galaxies with central post-starburst regions (CPSB), 37 galaxies with off-center ring-like post-starburst regions (RPSB) and 292 galaxies with irregular post-starburst regions (IPSB). Focussing on the CPSB and RPSB samples, and comparing their radial gradients in D$_n$4000, H$δ_{\rm A}$ and W(H$α$) to control samples, we find that while the CPSBs have suppressed star formation throughout their bulge and disk, and clear evidence of rapid decline of star formation in the central regions, the RPSBs only show clear evidence of recently rapidly suppressed star formation in their outer regions and an ongoing central starburst. The radial profiles in mass-weighted age and stellar $v/σ$ indicate that CPSBs and RPSBs are not simply different evolutionary stages of the same event, rather that CPSB galaxies are caused by a significant disruptive event, while RPSB galaxies are caused by disruption of gas fuelling to the outer regions. Compared to the control samples, both CPSB and RPSB galaxies show a higher fraction of interactions/mergers, misaligned gas or bars that might be the cause of the gas inflows and subsequent quenching.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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