Physical Properties of Massive Compact Starburst Galaxies with Extreme Outflows
Physical Properties of Massive Compact Starburst Galaxies with Extreme Outflows
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DOI：
10.3847/1538-4357/ac2fa4
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发表时间：
2021-06
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通讯作者：
S. Perrotta;E. George;A. Coil;C. Tremonti;D. Rupke;Julie D. Davis;A. Diamond-Stanic;J. Geach;R. Hickox;J. Moustakas;Grayson C. Petter;G. Rudnick;P. Sell;Cameren N. Swiggum;Kelly E. Whalen
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作者：
S. Perrotta;E. George;A. Coil;C. Tremonti;D. Rupke;Julie D. Davis;A. Diamond-Stanic;J. Geach;R. Hickox;J. Moustakas;Grayson C. Petter;G. Rudnick;P. Sell;Cameren N. Swiggum;Kelly E. Whalen
我们目前的结果的性质，极端喷射反馈事件和人口的大规模（M *<$1011 M <$），紧凑的星暴星系在z = 0.4-0.7的物理条件。我们使用来自Keck/NIRSPEC、SDSS、Gemini/GMOS、MMT和Magellan/法师的数据测量了14个星暴星系的静止坐标系光学和近红外光谱，这些星系具有极高的星星形成率表面密度（平均SFR = 2000 M/yr−1 kpc−2）和强大的星系外流（最大速度为98 × 1000-3000 km/s−1）。我们独特的数据集包括两种发射的集合（[O ii] λλ 3726，3729，Hβ，[O iii] λλ 4959，5007，Hα，[N ii] λλ 6549，6585和[S ii] λλ 6716，6731）和吸收（Mg Ⅱ λλ 2796，2803，和Fe Ⅱ λ2586）谱线，使我们能够研究冷气相（T = 104 K）在流出物中的运动学。利用一套线比诊断图，我们发现中心星暴的特征是高电子密度（中值n = 530 cm−3）和高金属丰度（太阳或超太阳）。我们表明，外流最有可能是由恒星反馈出现的极端中央星暴，而不是由活动星系核。我们还提出了多个有趣的观测签名表明，这些星系可能有大量的莱曼连续（LyC）光子泄漏，包括弱[S II]星云发射线。我们的研究结果意味着，这些星系可能在极端星星形成和反馈的短暂阶段被捕获，其中大部分气体被强大的外流猛烈地喷出，为LyC光子逃逸开辟了通道。
We present results on the nature of extreme ejective feedback episodes and the physical conditions of a population of massive (M * ∼ 1011 M ⊙), compact starburst galaxies at z = 0.4–0.7. We use data from Keck/NIRSPEC, SDSS, Gemini/GMOS, MMT, and Magellan/MagE to measure rest-frame optical and near-IR spectra of 14 starburst galaxies with extremely high star formation rate surface densities (mean ΣSFR ∼ 2000 M ⊙ yr−1 kpc−2) and powerful galactic outflows (maximum speeds v 98 ∼ 1000–3000 km s−1). Our unique data set includes an ensemble of both emission ([O ii] λλ3726,3729, Hβ, [O iii] λλ4959,5007, Hα, [N ii] λλ6549,6585, and [S ii] λλ6716,6731) and absorption (Mg ii λλ2796,2803, and Fe ii λ2586) lines that allow us to investigate the kinematics of the cool gas phase (T ∼ 104 K) in the outflows. Employing a suite of line ratio diagnostic diagrams, we find that the central starbursts are characterized by high electron densities (median n e ∼ 530 cm−3), and high metallicity (solar or supersolar). We show that the outflows are most likely driven by stellar feedback emerging from the extreme central starburst, rather than by an AGN. We also present multiple intriguing observational signatures suggesting that these galaxies may have substantial Lyman continuum (LyC) photon leakage, including weak [S ii] nebular emission lines. Our results imply that these galaxies may be captured in a short-lived phase of extreme star formation and feedback where much of their gas is violently blown out by powerful outflows that open up channels for LyC photons to escape.