THE MERGER-TRIGGERED ACTIVE GALACTIC NUCLEUS CONTRIBUTION TO THE ULTRALUMINOUS INFRARED GALAXY POPULATION
THE MERGER-TRIGGERED ACTIVE GALACTIC NUCLEUS CONTRIBUTION TO THE ULTRALUMINOUS INFRARED GALAXY POPULATION
复制标题
合并引发的活动星系核对超光红外星系群的贡献
DOI：
10.1088/2041-8205/753/2/l37
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
D. Ballantyne
中科院分区：
文献类型：
--
作者：
A. R. Draper;D. Ballantyne
长期以来，人们一直认为超亮红外星系（ULIRG）、类星体和重大合并之间存在联系。事实上，模拟显示，重大的合并能够引发大规模的星暴和类星体。然而，赫歇尔空间天文台的观测结果表明，至少在高红移的情况下，超红外群和合并之间可能并不总是存在简单的因果关系。在这里，我们将不断发展的合并触发的活动星系核（AGN）亮度函数与合并触发的星暴模型相结合，联合收割机来计算主要合并对ULIRG种群的最大贡献。我们发现，主要的合并可以占整个本地人口的ULIRG托管活动星系核和当地ULIRG总光度密度的25%。到z = 1时，主合并不再能解释活动星系核所在的ULIRG的光度密度，而贡献了ULIRG总光度密度的12%。这种下降可能是由于高红移星系更富含气体，因此能够通过长期演化实现高星星形成率。此外，我们发现，主要的合并可以解释当地人口的温暖ULIRGs。这表明，选择高红移暖ULIRGs将允许识别高红移合并触发的ULIRGs。由于主要的合并可能会触发非常高度模糊的活动星系核，一个显着的高红移温暖ULIRG人口的一部分可能主机康普顿厚活动星系核。
It has long been thought that there is a connection between ultraluminous infrared galaxies (ULIRGs), quasars, and major mergers. Indeed, simulations show that major mergers are capable of triggering massive starbursts and quasars. However, observations by the Herschel Space Observatory suggest that, at least at high redshift, there may not always be a simple causal connection between ULIRGs and mergers. Here, we combine an evolving merger-triggered active galactic nucleus (AGN) luminosity function with a merger-triggered starburst model to calculate the maximum contribution of major mergers to the ULIRG population. We find that major mergers can account for the entire local population of ULIRGs hosting AGNs and ∼25% of the total local ULIRG luminosity density. By z ∼ 1, major mergers can no longer account for the luminosity density of ULIRGs hosting AGNs and contribute ≲12% of the total ULIRG luminosity density. This drop is likely due to high-redshift galaxies being more gas rich and therefore able to achieve high star formation rates through secular evolution. Additionally, we find that major mergers can account for the local population of warm ULIRGs. This suggests that selecting high-redshift warm ULIRGs will allow for the identification of high-redshift merger-triggered ULIRGs. As major mergers are likely to trigger very highly obscured AGNs, a significant fraction of the high-redshift warm ULIRG population may host Compton thick AGNs.
DOI：
10.1088/0004-637x/721/1/98
发表时间：
2010-06
期刊：
The Astrophysical Journal
影响因子：
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作者：
J. Kartaltepe;D. Sanders;E. Floc’h;E. Floc’h;D. Frayer;H. Aussel;S. Arnouts;O. Ilbert;M. Salvato;N. Scoville;J. Surace;Lin Yan;P. Capak;K. Caputi;C. Carollo;P. Cassata;F. Civano;G. Hasinger;A. Koekemoer;O. Fèvre;S. Lilly;C. T. Liu;H. McCracken;E. Schinnerer;V. Smolčić;Y. Taniguchi;D. Thompson;J. Trump;V. Baldassare;S. Fiorenza
通讯作者：
J. Kartaltepe;D. Sanders;E. Floc’h;E. Floc’h;D. Frayer;H. Aussel;S. Arnouts;O. Ilbert;M. Salvato;N. Scoville;J. Surace;Lin Yan;P. Capak;K. Caputi;C. Carollo;P. Cassata;F. Civano;G. Hasinger;A. Koekemoer;O. Fèvre;S. Lilly;C. T. Liu;H. McCracken;E. Schinnerer;V. Smolčić;Y. Taniguchi;D. Thompson;J. Trump;V. Baldassare;S. Fiorenza