arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.01112astro-ph.GA
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WISSH QSO项目IX。z~2.4-4.7发光类星体的冷气含量和环境

The WISSH QSOs project IX. Cold gas content and environment of luminous QSOs at z~2.4-4.7

M. Bischetti, C. Feruglio, E. Piconcelli, F. Duras, M. Pèrez-Torres, R. Herrero, G. Venturi, S. Carniani, G. Bruni, I. Gavignaud, V. Testa, A. Bongiorno, M. Bru… 展开作者

M. Bischetti, C. Feruglio, E. Piconcelli, F. Duras, M. Pèrez-Torres, R. Herrero, G. Venturi, S. Carniani, G. Bruni, I. Gavignaud, V. Testa, A. Bongiorno, M. Brusa, C. Circosta, G. Cresci, V. D'Odorico, R. Maiolino, A. Marconi, M. Mingozzi, C. Pappalardo, M. Perna, E. Traianou, A. Travascio, G. Vietri, L. Zappacosta, F. Fiore

摘要:

在恒星形成和黑洞吸积的高峰期(z~2-4,即宇宙正午),类星体光度函数最亮端的源是研究大质量星系的馈送和反馈循环的有利场所。我们进行了第一次系统的研究,在最明亮的类星体的冷气属性,通过表征他们的宿主星系和环境。我们分析了ALMA,NOEMA和JVLA观测的FIR连续谱,CO和[CII]发射线在八个类星体($L_{\rm Bol}>3\times10^{47}$ erg/s)从WISSH样本在z~2.4-4.7。我们报告了100%的发射线检测率和80%的连续发射检测率,我们发现CO排放与迄今为止观察到的最陡峭的CO阶梯是一致的。亚毫米数据显示,在WISSH类星体的80%周围存在(一个或多个)明亮的伴星系,预计距离为6-130 kpc。我们观察到各种大小的分子气藏(1.7-10千秒差距),与旋转磁盘与扰动运动学。与FIR匹配的z~0-3主序星星系相比,WISSH类星体通常表现出更低的CO光度和更高的恒星形成效率,这意味着,考虑到观测到的SFR ~170-1100 $M_\odot$ /年,分子气体在小于5000万年时转化为恒星。大多数目标显示出极端的动力学黑洞质量比$M_{\rm dyn}/M_{\rm BH}\sim3-10$,两个数量级小于当地的关系。WISSH宿主中的分子气体分数比具有类似$M_*$的恒星形成星系低约10-100倍。WISSH类星体经历了中央SMBH和宿主星系的强烈增长阶段。他们精确定位了巨大星系聚集的高密度地点,并在最终宿主星系质量的积累中发挥了重要作用。所观察到的低分子气体分数和短的耗尽时间尺度可能是由于活动星系核的反馈,跟踪快速活动星系核驱动的电离外流在我们所有的目标。

英文摘要:

Sources at the brightest end of QSO luminosity function during the peak epoch of star formation and black hole accretion (z~2-4, i.e. Cosmic noon) are privileged sites to study the feeding & feedback cycle of massive galaxies. We perform the first systematic study of cold gas properties in the most luminous QSOs, by characterising their host-galaxies and environment. We analyse ALMA, NOEMA and JVLA observations of FIR continuum, CO and [CII] emission lines in eight QSOs ($L_{\rm Bol}>3\times10^{47}$ erg/s) from the WISSH sample at z~2.4-4.7. We report a 100% emission line detection rate and a 80% detection rate in continuum emission, and we find CO emission to be consistent with the steepest CO ladders observed so far. Sub-mm data reveal presence of (one or more) bright companion galaxies around 80% of WISSH QSOs, at projected distances of 6-130 kpc. We observe a variety of sizes for the molecular gas reservoirs (1.7-10 kpc), associated with rotating disks with disturbed kinematics. WISSH QSOs typically show lower CO luminosity and higher star formation efficiency than FIR matched, z~0-3 main-sequence galaxies, implying that, given the observed SFR ~170-1100 $M_\odot$/yr, molecular gas is converted into stars on <50 Myr. Most targets show extreme dynamical to black-hole mass ratios $M_{\rm dyn}/M_{\rm BH}\sim3-10$, two orders of magnitude smaller than local relations. The molecular gas fraction in WISSH hosts is lower by a factor of ~10-100 than in star forming galaxies with similar $M_*$. WISSH QSOs undergo an intense growth phase of both the central SMBH and host-galaxy. They pinpoint high-density sites where giant galaxies assemble and mergers play a major role in the build-up of the final host-galaxy mass. The observed low molecular gas fraction and short depletion timescale are likely due to AGN feedback, as traced by fast AGN-driven ionised outflows in all our targets.

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