论文标题

Rexcess中最强的酷芯:RXC J2014.8-2430中缺少X射线腔

The strongest cool core in REXCESS: Missing X-ray cavities in RXC J2014.8-2430

论文作者

Mroczkowski, Tony, Donahue, Megan, van Marrewijk, Joshiwa, Clarke, Tracy E., Hoffer, Aaron, Intema, Huib, Di Mascolo, Luca, Popping, Gergö, Pratt, Gabriel W., Sun, Ming, Voit, Mark

论文摘要

We present a multiwavelength study of RXC J2014.8-2430, the most extreme cool-core cluster in the Representative $XMM-Newton$ Cluster Structure Survey (REXCESS), using $Chandra$ X-ray, Southern Astrophysical Research (SOAR) Telescope, Atacama Large Millimeter/submillimeter Array (ALMA), Very Large Array (VLA), and Giant Metrewave Radio Telescope (GMRT)观察。虽然活跃银河核(AGN)的反馈被认为是抑制冷却流量的主要机制,但令人惊讶的是,$ chandra $成像观察结果并未揭示出在极端冷却核心的簇内介质(ICM)中预期的双边X射线腔。我们讨论了与任何未发现X射线腔有关的任何无线电气泡的存在的限制。我们将上限放置在最明亮的簇星系中的任何显着X射线AGN上,并表明X射线峰与中央无线电源相抵消,中央无线电源表现出陡峭的低频无线电光谱,指示电子老化。 SOAR数据揭示了扩展的发光线源。从我们的BCG的窄带H $α$成像中,中央H $α$峰与无线电观测值一致,但偏离了X射线峰,与以前在该群集中发现的荡妇一致。 Alma的观察结果显示,大量的分子气体储存到了延长的H $α$排放。我们得出的结论是,X射线气体中的无线电源及其空腔沿视线几乎对齐,或者是由晃动引起的RAM压力显着取代了凉爽的分子气体,也许可以使AGN反馈周期抢占。我们认为,鉴于H $α$,CO(1-0),无线电连续体和恒星发射峰以及它们与X射线中看到的完整酷芯的距离,核心附近的晃动可能是亚音速的,正如预期的那样,正如预期的。

We present a multiwavelength study of RXC J2014.8-2430, the most extreme cool-core cluster in the Representative $XMM-Newton$ Cluster Structure Survey (REXCESS), using $Chandra$ X-ray, Southern Astrophysical Research (SOAR) Telescope, Atacama Large Millimeter/submillimeter Array (ALMA), Very Large Array (VLA), and Giant Metrewave Radio Telescope (GMRT) observations. While feedback from an active galactic nucleus (AGN) is thought to be the dominant mechanism by which a cooling flow is suppressed, the $Chandra$ imaging observations surprisingly do not reveal the bi-lateral X-ray cavities expected in the intracluster medium (ICM) of an extreme cool core hosting a powerful radio source. We discuss the limits on the presence of any radio bubbles associated with any undetected X-ray cavities. We place upper limits on any significant X-ray AGN in the brightest cluster galaxy, and show that the X-ray peak is offset from the central radio source, which exhibits a steep low frequency radio spectrum indicative of electron ageing. The SOAR data reveal an extended, luminous emission line source. From our narrowband H$α$ imaging of the BCG, the central H$α$ peak is coincident with the radio observations, yet offset from the X-ray peak, consistent with sloshing found previously in this cluster. ALMA observations reveal a large reservoir of molecular gas that traces the extended H$α$ emission. We conclude either that the radio source and its cavities in the X-ray gas are nearly aligned along the line of sight, or that ram pressure induced by sloshing has significantly displaced the cool molecular gas feeding it, perhaps preempting the AGN feedback cycle. We argue that the sloshing near the core is likely subsonic, as expected, given the co-location of the H$α$, CO(1-0), radio continuum, and stellar emission peaks and their proximity to the intact cool core seen in X-ray.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源