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arXiv 1503.01783astro-ph.GAastro-ph.CO
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action中来自z~1.6流出QSO XID2028中分子气体含量的反馈证据

Evidence for feedback in action from the molecular gas content in the z~1.6 outflowing QSO XID2028

M. Brusa, C. Feruglio, G. Cresci, V. Mainieri, M. T. Sargent, M. Perna, P. Santini, F. Vito, A. Marconi, A. Merloni, D. Lutz, E. Piconcelli, G. Lanzuisi, R. Mai… 展开作者

M. Brusa, C. Feruglio, G. Cresci, V. Mainieri, M. T. Sargent, M. Perna, P. Santini, F. Vito, A. Marconi, A. Merloni, D. Lutz, E. Piconcelli, G. Lanzuisi, R. Maiolino, D. Rosario, E. Daddi, A. Bongiorno, F. Fiore, E. Lusso

摘要:

气体外流被认为在塑造星系中起着关键作用,因为它们调节恒星的形成和黑洞的生长。尽管它们无处不在,但这种强大和扩展的风的起源和加速机制尚未被理解。需要直接观测在其他波长上探测到外流的物体中的冷气成分,以评估外流对宿主星系星际介质(ISM)的影响。我们观察到的高原德布雷干涉仪在z~1.5,XID 2028,其中电离流出的存在已明确的信号由近红外光谱模糊的类星体。在这个源中的CO(3 - 2)排放的检测允许我们推断分子气体含量,并将其与来自粉尘排放的ISM质量进行比较。然后,我们分析的结果的背景下,最近的见解的标度关系,它描述了气体含量的整体人口的恒星形成星系在一个类似的红移。从CO(3 - 2)线推断的恒星形成效率(~100)和气体质量(M_gas = 2.1 - 9.5x10 ^{10} M_sun)取决于对跃迁激发和CO到H2转换因子的基本假设。然而,结合这些信息和从尘埃质量估计的ISM质量表明,XID 2028的ISM/气体含量显着低于其观测到的M $_\star$,sSFR和红移的预期,基于最新的校准(气体分数<20%和耗尽时间尺度<3.4亿年)。总的来说,我们从远红外和毫米数据中获得的约束表明,我们正在观察类星体反馈,能够从主机中移除气体

英文摘要:

Gas outflows are believed to play a pivotal role in shaping galaxies, as they regulate both star formation and black hole growth. Despite their ubiquitous presence, the origin and the acceleration mechanism of such powerful and extended winds is not yet understood. Direct observations of the cold gas component in objects with detected outflows at other wavelengths are needed to assess the impact of the outflow on the host galaxy interstellar medium (ISM). We observed with the Plateau de Bure Interferometer an obscured quasar at z~1.5, XID2028, for which the presence of an ionised outflow has been unambiguously signalled by NIR spectroscopy. The detection of CO(3-2) emission in this source allows us to infer the molecular gas content and compare it to the ISM mass derived from the dust emission. We then analyze the results in the context of recent insights on scaling relations, which describe the gas content of the overall population of star-forming galaxies at a similar redshifts. The Star formation efficiency (~100) and gas mass (M_gas=2.1-9.5x10^{10} M_sun) inferred from the CO(3-2) line depend on the underlying assumptions on the excitation of the transition and the CO-to-H2 conversion factor. However, the combination of this information and the ISM mass estimated from the dust mass suggests that the ISM/gas content of XID2028 is significantly lower than expected for its observed M$_\star$, sSFR and redshift, based on the most up-to-date calibrations (with gas fraction <20% and depletion time scale <340 Myr). Overall, the constraints we obtain from the far infrared and millimeter data suggest that we are observing QSO feedback able to remove the gas from the host

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