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arXiv 1105.3199astro-ph.CO
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Herschel-ATLAS:探测星系团周围的远红外人口

Herschel-ATLAS: detection of a far-infrared population around galaxy clusters

K. E. K. Coppin, J. E. Geach, Ian Smail, L. Dunne, A. C. Edge, R. J. Ivison, S. Maddox, R. Auld, M. Baes, S. Buttiglione, A. Cava, D. L. Clements, A. Cooray, A.… 展开作者

K. E. K. Coppin, J. E. Geach, Ian Smail, L. Dunne, A. C. Edge, R. J. Ivison, S. Maddox, R. Auld, M. Baes, S. Buttiglione, A. Cava, D. L. Clements, A. Cooray, A. Dariush, G. De Zotti, S. Dye, S. Eales, J. Fritz, R. Hopwood, E. Ibar, M. Jarvis, M. J. Michalowski, D. Murphy, M. Negrello, E. Pascale, M. Pohlen, E. Rigby, G. Rodighiero, D. Scott, S. Serjeant, D. J. B. Smith, P. Temi, P. van der Werf

摘要:

我们报告检测到一个显着过剩的远红外源的表面密度从赫歇尔天体物理太赫兹大面积调查(H-ATLAS)内~1百万秒差距的中心的66个光学选择的星系团在SDSS与<z>~0.25。从他们的同行的多波长特性的分析,我们得出结论,远红外辐射与尘埃遮蔽的恒星形成和/或星系团本身的星系内的活动星系核。过量在~0.8 Mpc的半径处达到最大值,其中我们发现平均每个簇1.0 \pm 0.3 S_250 um&gt;34 mJy源高于随机场位置的预期。如果远红外发射由恒星形成主导(与活动星系核相反),那么在L_IR&gt; 5d 10 L_sun的源中,这对应于每个星系团的平均恒星形成率约为7 M_sun/yr。虽然透镜源对多余信号的贡献可以忽略不计,但集群周围的一小部分源可以被引力透镜化,我们已经确定了集群透镜赫歇尔源的潜在案例样本,这些案例可以在后续研究中作为目标。

英文摘要:

We report the detection of a significant excess in the surface density of far-infrared sources from the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) within ~1 Mpc of the centres of 66 optically-selected clusters of galaxies in the SDSS with <z>~0.25. From the analysis of the multiwavelength properties of their counterparts we conclude that the far-infrared emission is associated with dust-obscured star formation and/or active galactic nuclei within galaxies in the clusters themselves. The excess reaches a maximum at a radius of ~0.8 Mpc, where we find 1.0\pm0.3 S_250um>34 mJy sources on average per cluster above what would be expected for random field locations. If the far-infrared emission is dominated by star formation (as opposed to AGN) then this corresponds to an average star formation rate of ~7 M_sun/yr per cluster in sources with L_IR>5d10 L_sun. Although lensed sources make a negligible contribution to the excess signal, a fraction of the sources around the clusters could be gravitationally lensed, and we have identified a sample of potential cases of cluster-lensed Herschel sources that could be targeted in follow-up studies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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