当前位置: X-MOL 学术Mon. Not. R. Astron. Soc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Star Formation in Luminous LoBAL Quasars at 2.0 < z < 2.5
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2020-07-10 , DOI: 10.1093/mnras/staa2017
Clare F Wethers 1 , Jari Kotilainen 1, 2 , Malte Schramm 3 , Andreas Schulze 3
Affiliation  

Low-ionisation broad absorption line quasars (LoBALs) mark an important, yet poorly understood, population of quasars showing direct evidence for energetic mass outflows. We outline a sample of 12 luminous (L$_{\rm{bol}}$ $>$10$^{46}$ergs$^{-1}$) LoBALs at 2.0$<$z$<$2.5 - a key epoch in both star formation and black hole accretion, which have been imaged as part of a targeted program with the \textit{Herschel} Spectral and Photometric Imaging REceiver (SPIRE). We present K-band NOTCam spectra for three of these targets, calculating their spectroscopic redshifts, black hole masses and bolometric luminosities, and increasing the total number of LoBAL targets in our sample with spectral information from five to eight. Based on FIR obeservations from \textit{Herschel} SPIRE, we derive prolific SFRs ranging 740 - 2380M$_{\rm{\odot}}$yr$^{-1}$ for the detected targets, consistent with LoBALs existing in an evolutionary phase associated with starburst activity. Furthermore, an upper limit of $<$440M$_{\rm{\odot}}$yr$^{-1}$ is derived for the non-detections, meaning moderate-to-high SFRs cannot be ruled out, even among the undetected targets. Indeed, we detect an enhancement in both the SFRs and FIR fluxes of LoBALs compared to HiBAL and non-BAL quasars, further supporting the evolutionary LoBAL paradigm. Despite this enhancement in SFR however, the environments of LoBALs appear entirely consistent with the general galaxy population at 2.0$<$z$<$2.5.

中文翻译:

2.0 < z < 2.5 的发光 LoBAL 类星体中的恒星形成

低电离宽吸收线类星体(LoBAL)标志着一个重要但知之甚少的类星体群,显示出高能质量外流的直接证据。我们概述了 12 个 luminous (L$_{\rm{bol}}$ $>$10$^{46}$ergs$^{-1}$) LoBAL 的样本,其值为 2.0$<$z$<$2.5 - 一个键恒星形成和黑洞吸积的新纪元,已被成像为使用 \textit{Herschel} 光谱和光度成像接收器 (SPIRE) 的目标程序的一部分。我们展示了其中三个目标的 K 波段 NOTCam 光谱,计算了它们的光谱红移、黑洞质量和热光度,并将样本中 LoBAL 目标的总数从五个增加到八个。基于来自 \textit{Herschel} SPIRE 的 FIR 观察结果,我们为检测到的目标推导出了 740 - 2380M$_{\rm{\odot}}$yr$^{-1}$ 的多产 SFR,与存在于与星暴活动相关的进化阶段的 LoBAL 一致。此外,未检测到的上限为 $<$440M$_{\rm{\odot}}$yr$^{-1}$,这意味着不能排除中到高的 SFR,即使在未检测到的目标中。事实上,与 HiBAL 和非 BAL 类星体相比,我们检测到 LoBAL 的 SFR 和 FIR 通量都有增强,进一步支持了进化的 LoBAL 范式。然而,尽管 SFR 有所增强,但 LoBAL 的环境似乎与一般星系群完全一致,为 2.0$<$z$<$2.5。$440M$_{\rm{\odot}}$yr$^{-1}$ 是针对未检测到的,这意味着不能排除中到高 SFR,即使在未检测到的目标中也是如此。事实上,与 HiBAL 和非 BAL 类星体相比,我们检测到 LoBAL 的 SFR 和 FIR 通量都有增强,进一步支持了进化的 LoBAL 范式。然而,尽管 SFR 有所增强,但 LoBAL 的环境似乎与一般星系群完全一致,为 2.0$<$z$<$2.5。$440M$_{\rm{\odot}}$yr$^{-1}$ 是针对未检测到的,这意味着不能排除中到高的 SFR,即使在未检测到的目标中也是如此。事实上,与 HiBAL 和非 BAL 类星体相比,我们检测到 LoBAL 的 SFR 和 FIR 通量都有增强,进一步支持了进化的 LoBAL 范式。然而,尽管 SFR 有所增强,但 LoBAL 的环境似乎与一般星系群完全一致,为 2.0$<$z$<$2.5。
更新日期:2020-07-10
down
wechat
bug