SUB-KILOPARSEC IMAGING OF COOL MOLECULAR GAS IN TWO STRONGLY LENSED DUSTY, STAR-FORMING GALAXIES
SUB-KILOPARSEC IMAGING OF COOL MOLECULAR GAS IN TWO STRONGLY LENSED DUSTY, STAR-FORMING GALAXIES
复制标题
两个强透镜尘埃恒星形成星系中冷分子气体的亚千秒差距成像
DOI：
10.1088/0004-637x/811/2/124
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
G. Wong
中科院分区：
文献类型：
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作者：
J. Spilker;M. Aravena;D. Marrone;M. Béthermin;M. Bothwell;J. Carlstrom;S. Chapman;J. Collier;C. Breuck;C. Fassnacht;T. Galvin;A. Gonzalez;J. González;K. Grieve;Y. Hezaveh;J. Ma;M. Malkan;A. O’Brien;K. Rotermund;M. Strandet;J. Vieira;A. Weiss;G. Wong
我们目前的空间分辨成像与澳大利亚望远镜紧凑型阵列（ATCA）的三个CO线在两个高红移引力透镜尘埃恒星形成星系，南极望远镜发现。强透镜使我们能够探测这两个物体中分子气体的结构和动力学，z = 2.78和z = 5.66，有效源平面分辨率小于1 kpc。我们以一致的方式模拟了来自多个CO跃迁和尘埃连续谱的透镜发射，发现由低J CO追踪的冷分子气体总是具有比870 μm尘埃连续谱发射更大的半光半径。这种尺寸差异导致冷气体与尘埃相比放大系数差异高达50%。在z = 2.78的星系中，这些CO观测证实了背景源正在经历一次重大的合并，而另一个源的速度场更为复杂。我们使用ATCA CO观测和可比分辨率阿塔卡马大毫米/亚毫米阵列尘埃连续成像相同的对象，以约束CO-H2转换因子与三个不同的程序，发现良好的协议之间的方法和价值观与快速恒星形成系统。我们讨论这些星系的背景下的星星形成气体质量表面密度的关系，注意到的变化，在发射面积与观测到的CO转换时，必须考虑到高红移星系的低红移对应。
We present spatially resolved imaging obtained with the Australia Telescope Compact Array (ATCA) of three CO lines in two high-redshift gravitationally lensed dusty star-forming galaxies, discovered by the South Pole Telescope. Strong lensing allows us to probe the structure and dynamics of the molecular gas in these two objects, at z = 2.78 and z = 5.66, with effective source-plane resolution of less than 1 kpc. We model the lensed emission from multiple CO transitions and the dust continuum in a consistent manner, finding that the cold molecular gas as traced by low-J CO always has a larger half-light radius than the 870 μm dust continuum emission. This size difference leads to up to 50% differences in the magnification factor for the cold gas compared to dust. In the z = 2.78 galaxy, these CO observations confirm that the background source is undergoing a major merger, while the velocity field of the other source is more complex. We use the ATCA CO observations and comparable resolution Atacama Large Millimeter/submillimeter Array dust continuum imaging of the same objects to constrain the CO–H2 conversion factor with three different procedures, finding good agreement between the methods and values consistent with those found for rapidly star-forming systems. We discuss these galaxies in the context of the star formation—gas mass surface density relation, noting that the change in emitting area with observed CO transition must be accounted for when comparing high-redshift galaxies to their lower redshift counterparts.
DOI：
10.1088/0004-637x/768/1/74
发表时间：
2012-11
期刊：
The Astrophysical Journal
影响因子：
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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-