BLOWIN’ IN THE WIND: BOTH “NEGATIVE” AND “POSITIVE” FEEDBACK IN AN OBSCURED HIGH-z QUASAR-猫眼课题宝

DOI：

10.1088/0004-637x/799/1/82

发表时间：

2014-11

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

G. Cresci;V. Mainieri;M. Brusa;A. Marconi;Michele Perna;F. Mannucci;E. Piconcelli;R. Maiolino;C. Feruglio;F. Fiore;A. Bongiorno;G. Lanzuisi;A. Merloni;M.Schramm;J. Silverman;F. Civano

类星体的反馈以强烈的外流形式出现，被认为是抑制星系中星星形成的关键机制，防止大质量星系过度生长并产生椭圆星系的红色。另一方面，一些模型也需要“积极的”活动星系核反馈，通过增强星际介质中的气体压力诱导宿主星系中的星星形成。然而，寻找这两种反馈效应的观测证据仍然是河外天文学的主要挑战之一，因为对高能和扩展辐射驱动风的观测很少。在这里，我们介绍了XID 2028的SINFONI近红外积分场光谱，XID 2028是一个在XMM-宇宙巡天中探测到的模糊的，无线电安静的z = 1.59类星体，其中我们清楚地解决了[O iii]线中的快速（1500 km s−1）和扩展（从黑洞到13 kpc）流出气体，其大速度和流出率仅由星星形成是不可持续的。哈勃空间望远镜/高级巡天照相机成像的Hα发射的窄分量和静止框架U波段通量能够映射宿主星系中当前的星星形成：两个示踪剂独立地显示流出位置位于一个空洞的中心，该空洞的边缘被星星形成区域所包围。因此，外流会将气体从宿主星系中移除（“负反馈”），但也会通过外流在边缘产生的压力触发星星的形成（“正反馈”）。XID 2028代表了第一个同时显示两种反馈的宿主星系。

Quasar feedback in the form of powerful outflows is invoked as a key mechanism to quench star formation in galaxies, preventing massive galaxies to overgrow and producing the red colors of ellipticals. On the other hand, some models are also requiring “positive” active galactic nucleus feedback, inducing star formation in the host galaxy through enhanced gas pressure in the interstellar medium. However, finding observational evidence of the effects of both types of feedback is still one of the main challenges of extragalactic astronomy, as few observations of energetic and extended radiatively driven winds are available. Here we present SINFONI near infrared integral field spectroscopy of XID2028, an obscured, radio-quiet z = 1.59 QSO detected in the XMM-COSMOS survey, in which we clearly resolve a fast (1500 km s−1) and extended (up to 13 kpc from the black hole) outflow in the [O iii] lines emitting gas, whose large velocity and outflow rate are not sustainable by star formation only. The narrow component of Hα emission and the rest frame U-band flux from Hubble Space Telescope/Advanced Camera for Surveys imaging enable to map the current star formation in the host galaxy: both tracers independently show that the outflow position lies in the center of an empty cavity surrounded by star forming regions on its edge. The outflow is therefore removing the gas from the host galaxy (“negative feedback”), but also triggering star formation by outflow induced pressure at the edges (“positive feedback”). XID2028 represents the first example of a host galaxy showing both types of feedback simultaneously at work.

BLOWIN’ IN THE WIND: BOTH “NEGATIVE” AND “POSITIVE” FEEDBACK IN AN OBSCURED HIGH-z QUASAR

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