Extending the Dynamic Range of Galaxy Outflow Scaling Relations: Massive Compact Galaxies with Extreme Outflows
Extending the Dynamic Range of Galaxy Outflow Scaling Relations: Massive Compact Galaxies with Extreme Outflows
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DOI：
10.3847/1538-4357/accbbf
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发表时间：
2023-07
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通讯作者：
Julie D. Davis;C. Tremonti;Cameren N. Swiggum;J. Moustakas;A. Diamond-Stanic;A. Coil;J. Geach;R. Hickox;S. Perrotta;Grayson C. Petter;G. Rudnick;D. Rupke;P. Sell;Kelly E. Whalen
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文献类型：
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作者：
Julie D. Davis;C. Tremonti;Cameren N. Swiggum;J. Moustakas;A. Diamond-Stanic;A. Coil;J. Geach;R. Hickox;S. Perrotta;Grayson C. Petter;G. Rudnick;D. Rupke;P. Sell;Kelly E. Whalen
我们研究了HizEA星系中的星系风，这是一个由46个z = 0.4 - 0.8的晚期星系合并组成的集合，恒星质量log（M */M）= 10.4 - 11.5，星星形成率（SFR）为20 - 500 M yr − 1，以及超紧凑（几百pc）的中央恒星形成区。我们使用MMT、Magellan和Keck的光学光谱中的Mg ii λ λ 2796，2803吸收线测量它们的气体运动学。我们在90%的目标中发现了外流的证据，最大外流速度为550 - 3200 km s − 1。我们结合联合收割机这些数据与10个样本从文献中构建的比例关系流出速度与SFR，星星形成表面密度（SFR），M *，和SFR/M *。HizEA星系扩展的动力学范围的标度关系的一个因素，在流出速度和一个数量级的SFR和BSFR的1/2 - 4。总体标度关系表现出较强的相关性流出速度，SFR，SFR/R，和COSFR，和较弱的相关性与M * 和SFR/M *。HizEA星系在SFR和M * 标度关系上是温和的异常值，但在外流速度与SFR/R和SFR的关系图上，它们与更典型的恒星形成星系平滑地连接。这些结果提供了进一步的证据，表明HizEA星系异常的外流速度是其极端的星星形成条件的结果，而不是隐藏的黑洞活动，并且它们加强了先前的主张，即BSFR是控制星系风速度的最重要属性之一。
We investigate galactic winds in the HizEA galaxies, a collection of 46 late-stage galaxy mergers at z = 0.4–0.8, with stellar masses of log(M*/M⊙)=10.4–11.5 , star formation rates (SFRs) of 20–500 M ⊙ yr−1, and ultra-compact (a few 100 pc) central star-forming regions. We measure their gas kinematics using the Mg ii λ λ 2796,2803 absorption lines in optical spectra from MMT, Magellan, and Keck. We find evidence of outflows in 90% of targets, with maximum outflow velocities of 550–3200 km s−1. We combine these data with ten samples from the literature to construct scaling relations for outflow velocity versus SFR, star formation surface density (ΣSFR), M *, and SFR/M *. The HizEA galaxies extend the dynamic range of the scaling relations by a factor of ∼2–4 in outflow velocity and an order of magnitude in SFR and ΣSFR. The ensemble scaling relations exhibit strong correlations between outflow velocity, SFR, SFR/R, and ΣSFR, and weaker correlations with M * and SFR/M *. The HizEA galaxies are mild outliers on the SFR and M * scaling relations, but they connect smoothly with more typical star-forming galaxies on plots of outflow velocity versus SFR/R and ΣSFR. These results provide further evidence that the HizEA galaxies’ exceptional outflow velocities are a consequence of their extreme star formation conditions rather than hidden black hole activity, and they strengthen previous claims that ΣSFR is one of the most important properties governing the velocities of galactic winds.