Dying of the Light: An X-Ray Fading Cold Quasar at z ∼ 0.405
Dying of the Light: An X-Ray Fading Cold Quasar at z ∼ 0.405
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DOI：
10.3847/1538-4357/abb94a
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发表时间：
2020-09
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通讯作者：
K. Cooke;A. Kirkpatrick;M. Estrada;H. Messias;A. Peca;N. Cappelluti;T. Ananna;J. Brewster;E. Glikman;S. LaMassa;T. K. Daisy Leung;J. Trump;Tracey Jane Turner;C. Urry
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作者：
K. Cooke;A. Kirkpatrick;M. Estrada;H. Messias;A. Peca;N. Cappelluti;T. Ananna;J. Brewster;E. Glikman;S. LaMassa;T. K. Daisy Leung;J. Trump;Tracey Jane Turner;C. Urry
冷类星体是一种罕见的亚群，被观测到拥有清晰的X射线发光的活动星系核（AGN），同时也保留了冷气体供应，为高星星形成率提供燃料。这些天体在演化的早期被解释为活动星系核。我们提出了新的索菲亚HAWC+远红外观测，远紫外到远红外（FUV-FIR）测光，光学光谱，以表征吸积和星星形成行为的冷类星体在z = 0.405（CQ 4479）。CQ 4479是一个星暴星系，拥有大量年轻恒星，气体质量分数高达50%-70%。活动星系核成分还没有成为远红外辐射的主要成分。我们还发现活动星系核的辐射热光度随观测方法和活动星系核探测区域的变化而变化。最后，我们确定了一个候选外流功能证实了冷类星体有能量反馈的假设。这个对象提出了一个有趣的研究活动星系核反馈的早期阶段，并探讨了罕见的阶段，活动星系核和冷气体成分共存。
Cold quasars are a rare subpopulation observed to host unobscured, X-ray luminous active galactic nuclei (AGN) while also retaining a cold gas supply fueling high star formation rates. These objects are interpreted as AGN early in their evolution. We present new SOFIA HAWC+ far-infrared observations, far-ultraviolet to far-infrared (FUV–FIR) photometry, and optical spectroscopy to characterize the accretion and star formation behavior in a cold quasar at z ∼ 0.405 (CQ 4479). CQ 4479 is a starburst galaxy with a predominantly young stellar population and a high gas mass fraction of ∼50%–70%. The AGN component has yet to become the dominant component of the FIR emission. We also find AGN bolometric luminosity that varies as a function of observation method and AGN region probed. Finally, we identify a candidate outflow feature corroborating the hypothesis that cold quasars have energetic feedback. This object presents an intriguing look into the early stages of AGN feedback and probes the rare phase where an AGN and cold gaseous component coexist.