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arXiv 1607.06459astro-ph.GA
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${\bf0.5<\textit{z}<4}$类星体宿主中的极端恒星形成事件

Extreme star formation events in quasar hosts over ${\bf0.5<\textit{z}<4}$

Lura K. Pitchford, Evanthia Hatziminaoglou, Anna Feltre, Duncan Farrah, Charlotte Clarke, Kathryn Harris, Peter Hurley, Sebastian Oliver, Mathew Page, Lingyu Wang

摘要:

我们探讨了513个光学发光的1型类星体的样本中的活动星系核和恒星形成之间的关系,红移高达$\sim$ 4托管极高的恒星形成率(SFR)。这些类星体被选定由位于$> $ 3 $σ$的\textit{Herschel} SPIRE仪器在250 $μ$ m处单独探测,从而产生$^{-1}$ $_{\odot}$年1000 M量级的典型SFR。我们发现平均SFR从$z\sim0.5$到$z\sim3$几乎增加了10倍,反映了同一时期共动SFR密度的上升。然而,我们发现,SFR保持近似恒定的吸积光度为10 $^{12}$ L $_{\odot}$以上的吸积光度增加。我们还发现,SFR不与黑洞质量。这两个结果是最合理的解释存在一个自我调节过程的星暴在高SFR,控制SFR的时间尺度可比或短于活动星系核或星暴占空比。我们还发现,SFR不依赖于爱丁顿比在任何红移,与SFR和每单位黑洞质量的黑洞增长率之间没有关系一致。最后,我们发现高电离宽吸收线(HiBAL)类星体具有与经典类星体不可区分的远红外特性,这与HiBAL类星体是沿着特定视线观察到的正常类星体相一致,HiBAL类星体中的流出物对其宿主中的恒星形成没有任何可测量的影响。

英文摘要:

We explore the relationship between active galactic nuclei and star formation in a sample of 513 optically luminous type 1 quasars up to redshifts of $\sim$4 hosting extremely high star formation rates (SFRs). The quasars are selected to be individually detected by the \textit{Herschel} SPIRE instrument at $> $3$σ$ at 250 $μ$m, leading to typical SFRs of order of 1000 M$_{\odot}$yr$^{-1}$. We find the average SFRs to increase by almost a factor 10 from $z\sim0.5$ to $z\sim3$, mirroring the rise in the comoving SFR density over the same epoch. However, we find that the SFRs remain approximately constant with increasing accretion luminosity for accretion luminosities above 10$^{12}$ L$_{\odot}$. We also find that the SFRs do not correlate with black hole mass. Both of these results are most plausibly explained by the existence of a self-regulation process by the starburst at high SFRs, which controls SFRs on time-scales comparable to or shorter than the AGN or starburst duty cycles. We additionally find that SFRs do not depend on Eddington ratio at any redshift, consistent with no relation between SFR and black hole growth rate per unit black hole mass. Finally, we find that high-ionisation broad absorption line (HiBAL) quasars have indistinguishable far-infrared properties to those of classical quasars, consistent with HiBAL quasars being normal quasars observed along a particular line of sight, with the outflows in HiBAL quasars not having any measurable effect on the star formation in their hosts.

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