Bright extragalactic ALMA redshift survey (BEARS) III: detailed study of emission lines from 71 Herschel targets
Bright extragalactic ALMA redshift survey (BEARS) III: detailed study of emission lines from 71 Herschel targets
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明亮河外 ALMA 红移巡天 (BEARS) III：详细研究 71 个赫歇尔目标的发射线
DOI：
10.1093/mnras/stad784
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发表时间：
2023
影响因子：
4.8
通讯作者：
Hagimoto M
中科院分区：
文献类型：
--
作者：
Hagimoto M
我们分析了阿塔卡马大型毫米/亚毫米阵列检测到的红移1.4和4.6之间的71个明亮赫歇尔选择星系的分子和原子发射线。这些谱线包括总共156条CO、[Cl]和H2O发射谱线。对于46个星系，我们检测到CO线的两个转变，对于这些星系，我们发现气体的性质类似于其他尘埃恒星形成星系（DSFG）的样品。与光解离模型的比较表明，大多数赫歇尔选择星系与本地红外光星系和高红移DSFG具有相似的星际介质条件，尽管比正常的恒星形成星系具有更密集的气体和更强烈的远紫外辐射场。线光度与五个数量级的光度标度关系一致，尽管星星形成和气体表面密度分布（即施密特-肯尼库特关系）表明，与本地和低红移的富含气体的正常恒星形成系统相比，我们的星系（和其他DSFG）中的星星形成阶段不同。这些星系的气尘比与银河系相似，没有明显的红移演化。46个来源中有4个似乎具有超过预期的最大（热化）剖面的CO线比率，这表明在DSFG的演化中存在一个罕见的阶段。最后，我们创建了一个深堆叠频谱在一个很宽的休息帧频率（220-890 GHz），揭示了微弱的过渡HCN和CH，符合以前的堆叠实验。
We analyse the molecular and atomic emission lines of 71 brightHerschel-selected galaxies between redshifts 1.4 and 4.6 detected by the Atacama Large Millimeter/submillimeter Array. These lines include a total of 156 CO,[C i], and H2O emission lines. For 46 galaxies, we detect two transitions of CO lines, and for these galaxies we find gas properties similar to those of other dusty star-forming galaxy (DSFG) samples. A comparison to photodissociation models suggests that most ofHerschel-selected galaxies have similar interstellar medium conditions as local infrared-luminous galaxies and high-redshift DSFGs, although with denser gas and more intense far-ultraviolet radiation fields than normal star-forming galaxies. The line luminosities agree with the luminosity scaling relations across five orders of magnitude, although the star formation and gas surface density distributions (i.e. Schmidt–Kennicutt relation) suggest a different star formation phase in our galaxies (and other DSFGs) compared to local and low-redshift gas-rich, normal star-forming systems. The gas-to-dust ratios of these galaxies are similar to Milky Way values, with no apparent redshift evolution. Four of 46 sources appear to have CO line ratios in excess of the expected maximum (thermalized) profile, suggesting a rare phase in the evolution of DSFGs. Finally, we create a deep stacked spectrum over a wide rest-frame frequency (220–890 GHz) that reveals faint transitions from HCN and CH, in line with previous stacking experiments.