The deepest Herschel-PACS far-infrared survey: number counts and infrared luminosity functions from combined PEP/GOODS-H observations
B. Magnelli, P. Popesso, S. Berta, F. Pozzi, D. Elbaz, D. Lutz, M. Dickinson, B. Altieri, P. Andreani, H. Aussel, M. Béthermin, A. Bongiovanni, J. Cepa, V. Char… 展开作者
B. Magnelli, P. Popesso, S. Berta, F. Pozzi, D. Elbaz, D. Lutz, M. Dickinson, B. Altieri, P. Andreani, H. Aussel, M. Béthermin, A. Bongiovanni, J. Cepa, V. Charmandaris, R. R. Chary, A. Cimatti, E. Daddi, N. M. Förster Schreiber, R. Genzel, C. Gruppioni, M. Harwit, H. S. Hwang, R. J. Ivison, G. Magdis, R. Maiolino, E. Murphy, R. Nordon, M. Pannella, A. Pérez García, A. Poglitsch, D. Rosario, M. Sanchez-Portal, P. Santini, D. Scott, E. Sturm, L. J. Tacconi, I. Valtchanov
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Accepted for publication in A&A; 22 pages, 13 figures; V2: updated to match accepted version
We present results from the deepest Herschel-PACS (Photodetector Array Camera and Spectrometer) far-infrared blank field extragalactic survey, obtained by combining observations of the GOODS (Great Observatories Origins Deep Survey) fields from the PACS Evolutionary Probe (PEP) and GOODS-Herschel key programmes. We describe data reduction and the construction of images and catalogues. In the deepest parts of the GOODS-S field, the catalogues reach 3-sigma depths of 0.9, 0.6 and 1.3 mJy at 70, 100 and 160 um, respectively, and resolve ~75% of the cosmic infrared background at 100um and 160um into individually detected sources. We use these data to estimate the PACS confusion noise, to derive the PACS number counts down to unprecedented depths and to determine the infrared luminosity function of galaxies down to LIR=10^11 Lsun at z~1 and LIR=10^12 Lsun at z~2, respectively. For the infrared luminosity function of galaxies, our deep Herschel far-infrared observations are fundamental because they provide more accurate infrared luminosity estimates than those previously obtained from mid-infrared observations. Maps and source catalogues (>3-sigma) are now publicly released. Combined with the large wealth of multi-wavelength data available for the GOODS fields, these data provide a powerful new tool for studying galaxy evolution over a broad range of redshifts.
Enhanced star formation rates in AGN hosts with respect to inactive galaxies from PEP-Herschel observations
我们比较了在0.5<z<2.5时，X射线选择的活动星系核宿主与质量匹配的控制不活跃星系的平均恒星形成（SF）活动，包括恒星形成和静止源。最近的观测进行的PACS，60- 210微米赫歇尔测光相机，在GOODS-S，GOODS-N和COSMOS允许我们无偏地估计远红外光度，因此SF属性，这两个样品。精确的AGN宿主恒星质量是通过将它们的总辐射分解为恒星和核成分来测量的。我们发现一个更高的平均SF活动在活动星系核主机相对于非活动星系核。在低X射线光度（Lx<~10^43.5erg/s）时，SF增强的水平是适度的（~0.26dex at ~3sigma），而在明亮的活动星系核（AGN）中，SF增强的水平更为显著（0.56dex at > 10 sigma）。然而，当比较的恒星形成星系，活动星系核主机是广泛一致的轨迹，他们的“主要序列”。我们研究了活动星系和非活动星系的相对远红外光度分布，发现发现了较高比例的PACS，因此在活动星系核宿主中有正常和高度的恒星形成系统。虽然不同的解释是可能的，我们解释我们的研究结果作为一个双重活动星系核的增长路径的结果：微弱的活动星系核通过长期的过程，与瞬时活动星系核吸积不紧密联系在一起的当前总SF在主机，而发光的活动星系核共同发展与他们的主机通过增强活动星系核的活动和SF期间，可能通过重大合并。虽然增加SF相对于非活动星系核的类似质量，预计在后者中，我们解…
Evolution of Dust Temperature of Galaxies through Cosmic Time as seen by Herschel
作为PEP和HerMES关键方案的一部分，我们研究了赫歇尔空间天文台在大天文台起源深空巡天-北领域观测到的红移范围为0.1<z<2.8的星系的尘埃性质。利用Herschel星上的PACS和SPIRE仪器获得的远红外（FIR）通量密度，拟合光谱能量分布（SED），得到星系的红外（IR）光度（L_IR）和尘埃温度（T_dust）。作为参考样本，我们还获得了<0.1 using AKARI and IRAS data in the field of the Sloan Digital Sky Survey. We compare the L_IR-T_dust relation between the two samples and find that: the median T_dust of Herschel-selected galaxies at z>LIR> 5 × 10 ^{10} L_ \odot的z = 0.5的本星系的红外光度和尘埃温度，比具有相似光度的AKARI选择的本星系冷2-5 K，并且由于存在本星系中所没有的冷星系，高z星系的T_dust色散随L_IR的增加而增加.我们发现，这种大的色散的L_IR-T_dust关系可以弥合本地恒星形成星系和高z亚毫米星系（SMG）之间的差距。我们还发现，本研究中的三个T_dust很低（<20 K）的SMG都有相似的2…
