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arXiv 1209.3016astro-ph.COastro-ph.HE
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在X射线发光活动星系核中没有明显的亚毫米波段恒星形成特征

No clear submillimetre signature of suppressed star formation amongst X-ray luminous AGNs

C. M. Harrison, D. M. Alexander, J. R. Mullaney, B. Altieri, D. Coia, V. Charmandaris, E. Daddi, H. Dannerbauer, K. Dasyra, A. Del Moro, M. Dickinson, R. C. Hic… 展开作者

C. M. Harrison, D. M. Alexander, J. R. Mullaney, B. Altieri, D. Coia, V. Charmandaris, E. Daddi, H. Dannerbauer, K. Dasyra, A. Del Moro, M. Dickinson, R. C. Hickox, R. J. Ivison, J. Kartaltepe, E. Le Floc'h, R. Leiton, B. Magnelli, P. Popesso, E. Rovilos, D. Rosario, A. M. Swinbank

摘要:

许多理论模型需要强大的活动星系核(AGN)来抑制遥远星系中的恒星形成,并再现今天大质量星系的观测特性。最近一项基于Herschel-SPIRE亚毫米波观测的研究声称为这一图像提供了直接支持,该研究报告称,在钱德拉深场北(CDF-N)中,z=1-3处最明亮的活动星系核(Lx>10^44 erg/s)的平均恒星形成率(SFR)显著下降。在这封信中,我们使用COSMOS和CDF-S场中的Herschel-SPIRE 250 μ m数据扩展了这些结果,使Lx>10^44 erg/s时的源数提高了一个数量级。根据我们的分析,我们没有发现在z=1-3时Lx>10^44 erg/s的活动星系核中存在抑制恒星形成的强有力证据。在Lx~10^43-10^45 erg/s的宽X射线光度范围内,活动星系核的平均SFR是恒定的(在z~2; ~100-200 Msol/yr时,平均SFR与典型的恒星形成星系一致<SFRs>)。我们认为,以前的CDF-N结果可能是由于低的数字统计。我们讨论我们的结果在当前的理论模型的背景下。

英文摘要:

Many theoretical models require powerful active galactic nuclei (AGNs) to suppress star formation in distant galaxies and reproduce the observed properties of today's massive galaxies. A recent study based on Herschel-SPIRE submillimetre observations claimed to provide direct support for this picture, reporting a significant decrease in the mean star-formation rates (SFRs) of the most luminous AGNs (Lx>10^44 erg/s) at z=1-3 in the Chandra Deep Field-North (CDF-N). In this letter we extend these results using Herschel-SPIRE 250um data in the COSMOS and CDF-S fields to achieve an order of magnitude improvement in the number of sources at Lx>10^44 erg/s. On the basis of our analysis, we find no strong evidence for suppressed star formation in Lx>10^44 erg/s AGNs at z=1-3. The mean SFRs of the AGNs are constant over the broad X-ray luminosity range of Lx~10^43-10^45 erg/s (with mean SFRs consistent with typical star-forming galaxies at z~2; <SFRs>~100-200 Msol/yr). We suggest that the previous CDF-N results were likely due to low number statistics. We discuss our results in the context of current theoretical models.

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