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arXiv 2209.13632astro-ph.GA
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中等红移、极致密、大质量星暴星系的空间密度

The Space Density of Intermediate Redshift, Extremely Compact, Massive Starburst Galaxies

Kelly E. Whalen, Ryan C. Hickox, Alison L. Coil, Aleksandar M. Diamond-Stanic, James E. Geach, John Moustakas, Gregory H. Rudnick, David S. N. Rupke, Paul H. Se… 展开作者

Kelly E. Whalen, Ryan C. Hickox, Alison L. Coil, Aleksandar M. Diamond-Stanic, James E. Geach, John Moustakas, Gregory H. Rudnick, David S. N. Rupke, Paul H. Sell, Christy A. Tremonti, Julie D. Davis, Serena Perrotta, Grayson C. Petter

摘要:

我们提出了一个测量的内在空间密度的中等红移($z\sim0.5$),大质量($M_{*} \sim 10^{11} \ \text{M}_{\odot}$),紧凑($R_{e} \sim 100$ PC)星暴($Σ_{SFR} \sim 1000 \ \text{M}_{\odot} \ \text{yr}^{-1} \text{kpc}^{-1}$)星系的潮汐功能表明,他们经历了最近的重大合并。它们中的一个子集拥有千秒差距尺度,$>1000 \ \text{km}\ \text{s}^{-1}$流出,几乎没有活动星系核活动的迹象,这表明极端的恒星形成可能是大规模反馈的主要驱动力。本文的目的是计算它们的空间密度,这样我们就可以把它们放在一个更好的宇宙学背景下。我们通过经验模型的大质量,紧凑的星暴星系的恒星星族。我们确定的平均时间尺度,最近经历了一个极端的核星爆星系将有针对性的,并包括在我们的光谱选择的样本。我们发现,大规模的,紧凑的星暴星系的目标,我们的标准将是可选择的$\sim 148 ^{+27}_{-24}$ Myr,并有一个内在的空间密度$n_{\text{CS}} \sim (1.1^{+0.5}_{-0.3}) \times 10^{-6} \ \ \text{Mpc}^{-3}$。这个空间密度与我们的$z\sim0.5$致密星暴是宇宙早期致密恒星形成星系中最致密和恒星形成的低红移类似物,以及它们是一小部分中等红移后星暴和致密静止星系的祖先是一致的。

英文摘要:

We present a measurement of the intrinsic space density of intermediate redshift ($z\sim0.5$), massive ($M_{*} \sim 10^{11} \ \text{M}_{\odot}$), compact ($R_{e} \sim 100$ pc) starburst ($Σ_{SFR} \sim 1000 \ \text{M}_{\odot} \ \text{yr}^{-1} \text{kpc}^{-1}$) galaxies with tidal features indicative of them having undergone recent major mergers. A subset of them host kiloparsec scale, $>1000 \ \text{km}\ \text{s}^{-1}$ outflows and have little indication of AGN activity, suggesting that extreme star formation can be a primary driver of large-scale feedback. The aim for this paper is to calculate their space density so we can place them in a better cosmological context. We do this by empirically modeling the stellar populations of massive, compact starburst galaxies. We determine the average timescale for which galaxies that have recently undergone an extreme nuclear starburst would be targeted and included in our spectroscopically selected sample. We find that massive, compact starburst galaxies targeted by our criteria would be selectable for $\sim 148 ^{+27}_{-24}$ Myr and have an intrinsic space density $n_{\text{CS}} \sim (1.1^{+0.5}_{-0.3}) \times 10^{-6} \ \ \text{Mpc}^{-3}$. This space density is broadly consistent with our $z\sim0.5$ compact starbursts being the most extremely compact and star forming low redshift analogs of the compact star forming galaxies in the early Universe as well as them being the progenitors to a fraction of intermediate redshift post starburst and compact quiescent galaxies.

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