Rapidly growing black holes and host galaxies in the distant Universe from the Herschel Radio Galaxy Evolution Project
Rapidly growing black holes and host galaxies in the distant Universe from the Herschel Radio Galaxy Evolution Project
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DOI：
10.1051/0004-6361/201323310
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发表时间：
2014-04
影响因子：
6.5
通讯作者：
G. Drouart;C. Breuck;J. Vernet;N. Seymour;M. Lehnert;Pieter Barthel;F. Bauer;E. Ibar;A. Galametz;M. Haas;N. Hatch;J. Mullaney;N. Nesvadba;B. Rocca-Volmerange;H. Röttgering;D. Stern;D. Wylezalek
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文献类型：
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作者：
G. Drouart;C. Breuck;J. Vernet;N. Seymour;M. Lehnert;Pieter Barthel;F. Bauer;E. Ibar;A. Galametz;M. Haas;N. Hatch;J. Mullaney;N. Nesvadba;B. Rocca-Volmerange;H. Röttgering;D. Stern;D. Wylezalek
本文介绍了对70个射电星系的综合观测结果，这些星系的红移分别为1 × 10（12）L圆点和超亮（L-tot（IR）> 10（13）L圆点）红外星系。我们适合的红外SED与一组经验的模板，代表灰尘加热的各种星爆（SB）和活动星系核（AGN）。我们发现射电星系的SEDs需要活动星系核和SB同时加热尘埃，但这两个分量的光度并不强相关。在简单的物理假设和经验关系的基础上，计算了每个射电星系的星星形成率（SFR）、黑洞质量吸积率（M/BH）和黑洞质量（M-BH）。我们发现，宿主星系和它们的黑洞都在非常迅速地增长，其SFR约为100-5000 M-圈点yr（-1），(M)过点（BH）约为1-100 M（圆点）yr（-1）。z > 2：5的射电星系的平均比SFR（sSFR）高于相同红移范围内的典型星星形成星系的sSFR，但与z < 2.5的射电星系的星系群相似或可能更低。通过比较sSFR和特异性。(M)在点（BH）（s（M）在点（BH）），我们得出的结论是，在无线电响亮AGN黑洞已经，或很快将是过于庞大，与他们的宿主星系的期望从本地M-BH-M-Gal关系。为了赶上黑洞，与黑洞积极吸积的时间相比，星系需要大约一个数量级的时间来增加观测到的SFR的质量。然而，在目前的活动周期中，我们认为，这种追赶可能是困难的，因为气体耗尽时间短。最后，我们推测如何宿主星系可能会增长足够的恒星质量，最终落在本地MBH-MGal关系。
We present results from a comprehensive survey of 70 radio galaxies at redshifts 1 10(12) L-circle dot) or hyper-luminous (L-tot(IR) > 10(13) L-circle dot) infrared galaxies. We fit the infrared SEDs with a set of empirical templates which represent dust heated by a variety of starbursts (SB) and by an active galactic nucleus (AGN). We find that the SEDs of radio galaxies require the dust to be heated by both AGN and SB, but the luminosities of these two components are not strongly correlated. Assuming empirical relations and simple physical assumptions, we calculate the star formation rate (SFR), the black hole mass accretion rate ((M) over dot(BH)), and the black hole mass (M-BH) for each radio galaxy. We find that the host galaxies and their black holes are growing extremely rapidly, having SFR approximate to 100-5000 M-circle dot yr(-1) and. (M) over dot(BH) approximate to 1-100 M(circle dot)yr(-1). The mean specific SFRs (sSFR) of radio galaxies at z > 2 : 5 are higher than the sSFR of typical star forming galaxies over the same redshift range, but are similar or perhaps lower than the galaxy population for radio galaxies at z < 2.5. By comparing the sSFR and the specific. (M) over dot(BH) (s(M) over dot(BH)), we conclude that black holes in radio loud AGN are already, or soon will be, overly massive compared to their host galaxies in terms of expectations from the local M-BH-M-Gal relation. In order to catch up with the black hole, the galaxies require about an order of magnitude more time to grow in mass at the observed SFRs compared to the time the black hole is actively accreting. However, during the current cycle of activity, we argue that this catching up is likely to be difficult because of the short gas depletion times. Finally, we speculate on how the host galaxies might grow sufficiently in stellar mass to ultimately fall onto the local MBH-MGal relation.