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arXiv 2103.05655astro-ph.GA
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矮-矮星系合并区Mrk 709中星团的形成和AGN活动

Clumpy Star Formation and AGN Activity in Dwarf-Dwarf Galaxy Merger Mrk 709

Erin Kimbro, Amy E. Reines, Mallory Molina, Adam T. Deller, Daniel Stern

摘要:

在其附近,低金属丰度的矮星暴星系拥有活动星系核(AGN),为研究星系及其超大质量黑洞(BH)的早期演化提供了最好的局部类似物。在这里,我们提出了一个详细的多波长调查的恒星形成和BH活动的低金属丰度矮-矮星系合并Mrk 709。使用哈勃太空望远镜H $α$和连续成像结合凯克光谱,我们确定这两个矮星系可能处于合并的早期阶段(即,他们的第一次通过),并发现了一个壮观的$\sim 10$ kpc长的年轻大质量星团串($t \lesssim 10$ Myr; $M_\star \gtrsim 10^5~M_\odot$)之间的星系相互作用触发。我们发现,南部星系,Mrk 709 S,正在经历类似于在高红移星系,与多个年轻的星团/团块的恒星质量之间的$10^7$和$10^8~M_\odot$的恒星形成的clusional模式。此外,我们提出了Mrk 709 S中低光度活动星系核的额外证据(由Reines等人在2014年(arXiv:1405.0278)使用无线电和X射线观测首次发现),包括日冕[Fe X]光学发射线的检测。这里介绍的工作提供了一个独特的一瞥到过程的关键层次星系形成和BH的增长在早期宇宙。

英文摘要:

Nearby, low-metallicity dwarf starburst galaxies hosting active galactic nuclei (AGNs) offer the best local analogs to study the early evolution of galaxies and their supermassive black holes (BHs). Here we present a detailed multi-wavelength investigation of star formation and BH activity in the low-metallicity dwarf-dwarf galaxy merger Mrk 709. Using Hubble Space Telescope H$α$ and continuum imaging combined with Keck spectroscopy, we determine that the two dwarf galaxies are likely in the early stages of a merger (i.e., their first pass) and discover a spectacular $\sim 10$ kpc-long string of young massive star clusters ($t \lesssim 10$ Myr; $M_\star \gtrsim 10^5~M_\odot$) between the galaxies triggered by the interaction. We find that the southern galaxy, Mrk 709 S, is undergoing a clumpy mode of star formation resembling that seen in high-redshift galaxies, with multiple young clusters/clumps having stellar masses between $10^7$ and $10^8~M_\odot$. Furthermore, we present additional evidence for a low-luminosity AGN in Mrk 709 S (first identified by Reines et al. 2014 (arXiv:1405.0278) using radio and X-ray observations), including the detection of the coronal [Fe X] optical emission line. The work presented here provides a unique glimpse into processes key to hierarchical galaxy formation and BH growth in the early Universe.

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