VLA imaging of 12CO J = 1-0 and free-free emission in lensed submillimetre galaxies

VLA imaging of 12CO J = 1-0 and free-free emission in lensed submillimetre galaxies
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亚毫米透镜星系中 12CO J = 1-0 和自由发射的 VLA 成像

DOI:
10.1111/j.1365-2966.2012.21584.x
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发表时间:
2012
影响因子:
4.8
通讯作者:
G. V. Moorsel
G. V. Moorsel
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
A. Thomson;R. Ivison;R. Ivison;I. Smail;A. Swinbank;A. Weiss;J. Kneib;Padelis P. Papadopoulos;A. Baker;C. Sharon;G. V. Moorsel

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我们提出了一项使用 Karl G. Jansky 甚大阵列 (VLA) 在 z = 2.52.9 的三个强透镜亚毫米选定星系(SMM?J16359、SMM?J14009 和 SMM?J02399)中发射 12CO J = 1-0 的研究。这些星系的跨度 LIR = 10111013?L?,提供了一个机会来比较高红移的发光红外星系和超发光红外星系的星际介质。我们估计气体分子质量在 240 X 109?M 范围内?使用一种假设恒星形成和非恒星形成气相的典型基础亮度温度 (Tb) 比率以及最大恒星形成效率的方法。更简单的方法是使用 XCO = 0.8 和测量的 Tb 比率,产生两倍高的气体质量。在SMM?J14009中,我们发现L CO 3-2'/L CO 1-0'=0.95+/-0.12,表明温暖的恒星形成气体,可能受到中央活动星系核(AGN)的影响。我们将气体质量限制设置为 3s \textless 6 X 108?M?对于莱曼断裂星系,A2218 #384,与 SMM?J16359 在 z = 2.515 位于同一视场。最后,我们使用类似于 115 GHz 自由通量密度的静止框架进行 SMM?J14009 和 SMM?J02399 测量,这些测量直接与大质量恒星的光电离率相关,并通过 VLA 的带宽来估计 400600?M??yr-1 的恒星形成率 (SFR) 并估计 AGN 引起的 LIR 部分。
We present a study using the Karl G. Jansky Very Large Array (VLA) of 12CO J = 1-0 emission in three strongly lensed submillimetre-selected galaxies (SMM?J16359, SMM?J14009 and SMM?J02399) at z = 2.52.9. These galaxies span LIR = 10111013?L?, offering an opportunity to compare the interstellar medium of luminous infrared galaxies and ultraluminous infrared galaxies at high redshift. We estimate molecular gas masses in the range of 240 X 109?M? using a method that assumes canonical underlying brightness temperature (Tb) ratios for star-forming and non-star-forming gas phases and a maximal star formation efficiency. A more simplistic method using XCO = 0.8 and the measured Tb ratios yields gas masses twice as high. In SMM?J14009 we find L CO 3-2'/L CO 1-0'=0.95+/-0.12, indicative of warm, star-forming gas, possibly influenced by the central active galactic nucleus (AGN). We set a gas mass limit of 3s \textless 6 X 108?M? for the Lyman break galaxy, A2218 #384, located in the same field as SMM?J16359 at z = 2.515. Finally, we use the rest-frame similar to 115?GHz freefree flux densities for SMM?J14009 and SMM?J02399 measurements tied directly to the photoionization rate of massive stars, and made possible by VLA's bandwidth to estimate star formation rates (SFRs) of 400600?M??yr-1 and to estimate the fraction of LIR due to AGN.
DOI: 10.1086/513306
发表时间: 2007-01
期刊: The Astrophysical Journal
影响因子: --
作者:
E. Valiante;D. Lutz;E. Sturm;R. Genzel;L. Tacconi;M. Lehnert;Andrew J. Baker
通讯作者: E. Valiante;D. Lutz;E. Sturm;R. Genzel;L. Tacconi;M. Lehnert;Andrew J. Baker
z ~ 2 8 处两个发光亚毫米星系的中红外光谱
DOI: 10.1086/431217
发表时间: 2005
期刊: The Astrophysical Journal Letters
影响因子: --
作者:
Valiante;Genzel;Tacconi;Lehnert
通讯作者: Lehnert