ALMA Reveals the Molecular Gas Properties of Five Star-forming Galaxies across the Main Sequence at 3
ALMA Reveals the Molecular Gas Properties of Five Star-forming Galaxies across the Main Sequence at 3
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ALMA 揭示了主序带 3 处五个恒星形成星系的分子气体特性
DOI：
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发表时间：
2020
影响因子：
4.9
通讯作者：
V. Smolčić
中科院分区：
文献类型：
--
作者：
P. Cassata;Daizhong Liu;B. Groves;E. Schinnerer;E. Ibar;M. Sargent;A. Karim;M. Talia;O. Fèvre;L. Tasca;B. Lemaux;B. Ribeiro;S. Fiore;M. Romano;C. Mancini;L. Morselli;G. Rodighiero;L. Rodríguez;A. Enia;V. Smolčić
我们在四个星系中探测到了信噪比（S/N）> 7-13的CO（5−4）和信噪比> 3的较低CO跃迁（CO（4−3），和CO（3 - 2）为一个）与阿塔卡马大型毫米/亚毫米阵列在波段3和4在五个主序星（MS）恒星质量（3-6）× 1010 M在3 < z <3.5.我们发现总远红外光度LFIR和CO（5−4）跃迁的光度之间有很好的相关性，其中随星星形成率（SFR）的增加而增加，表明CO（5−4）是这些星系中遮蔽SFR的一个很好的示踪剂。这两个星系的位置更接近恒星形成MS的CO谱线能量分布（SLED）的斜率是可比的其他恒星形成的人口，如本地亚毫米星系和BzK恒星形成星系;三个对象具有较高的特定星星形成率有更陡峭的CO SLED，这可能表明一个更集中的情节星星形成。通过利用CO SLED斜率来外推CO（1−0）跃迁的光度，并使用MS星系的经典转换因子，我们发现这些星系非常富含气体，分子气体分数在60%和80%之间，并且耗尽时间相当长，在0.2和1 Gyr之间。最后，我们得到的动力学质量相当于恒星和气体质量之和（至少五分之四的星系），使我们能够在前所未有的红移上对MS星系的αCO参数进行第一次约束。
We present the detection of CO (5−4) with signal-to-noise ratio (S/N) > 7–13 and a lower CO transition with S/N > 3 (CO (4−3) for four galaxies, and CO (3−2) for one) with the Atacama Large Millimeter/submillimeter Array in bands 3 and 4 in five main-sequence (MS) star-forming galaxies with stellar masses (3–6) × 1010M⊙ at 3 < z < 3.5. We find a good correlation between the total far-infrared luminosity LFIR and the luminosity of the CO (5−4) transition , where increases with star formation rate (SFR), indicating that CO (5−4) is a good tracer of the obscured SFR in these galaxies. The two galaxies that lie closer to the star-forming MS have CO spectral line energy distribution (SLED) slopes that are comparable to other star-forming populations, such as local submillimeter galaxies and BzK star-forming galaxies; the three objects with higher specific star formation rates have far steeper CO SLEDs, which possibly indicates a more concentrated episode of star formation. By exploiting the CO SLED slopes to extrapolate the luminosity of the CO (1−0) transition and using a classical conversion factor for MS galaxies of , we find that these galaxies are very gas-rich, with molecular gas fractions between 60% and 80% and quite long depletion times, between 0.2 and 1 Gyr. Finally, we obtain dynamical masses that are comparable to the sum of stellar and gas mass (at least for four out of five galaxies), allowing us to put a first constraint on the αCO parameter for MS galaxies at an unprecedented redshift.
DOI：
10.1088/0004-637x/768/1/74
发表时间：
2012-11
期刊：
The Astrophysical Journal
影响因子：
--
作者：
L. Tacconi;R. Neri;R. Genzel;F. Combes;A. Bolatto;M. Cooper;S. Wuyts;F. Bournaud;A. Burkert-
通讯作者：
L. Tacconi;R. Neri;R. Genzel;F. Combes;A. Bolatto;M. Cooper;S. Wuyts;F. Bournaud;A. Burkert-
DOI：
10.3847/1538-4357/aa6d82
发表时间：
2016-03
期刊：
The Astrophysical Journal
影响因子：
--
作者：
P. Lang;N. F. Schreiber;R. Genzel;R. Genzel;S. Wuyts;E. Wisnioski;A. Beifiori;S. Belli;R. Be
通讯作者：
P. Lang;N. F. Schreiber;R. Genzel;R. Genzel;S. Wuyts;E. Wisnioski;A. Beifiori;S. Belli;R. Be
影响因子：
6.5
作者：
McCracken, H. J.;Milvang-Jensen, B.;Zabl, J.
通讯作者：
Zabl, J.