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阿塔卡马宇宙学望远镜:南部巡天的尘埃恒星形成星系和活动星系核

The Atacama Cosmology Telescope: Dusty Star-Forming Galaxies and Active Galactic Nuclei in the Southern Survey

Danica Marsden, Megan Gralla, Tobias A. Marriage, Eric R. Switzer, Bruce Partridge, Marcella Massardi, Gustavo Morales, Graeme Addison, J Richard Bond, Devin Cr… 展开作者

Danica Marsden, Megan Gralla, Tobias A. Marriage, Eric R. Switzer, Bruce Partridge, Marcella Massardi, Gustavo Morales, Graeme Addison, J Richard Bond, Devin Crichton, Sudeep Das, Mark Devlin, Rolando Dunner, Amir Hajian, Matt Hilton, Adam Hincks, John P. Hughes, Kent Irwin, Arthur Kosowsky, Felipe Menanteau, Kavilan Moodley, Michael Niemack, Lyman Page, Erik D. Reese, Benjamin Schmitt, Neelima Sehgal, Jonathan Sievers, Suzanne Staggs, Daniel Swetz, Robert Thornton, Edward Wollack

摘要:

我们提出了一个目录中的191河外星系源检测的阿塔卡马宇宙望远镜(ACT)在148 GHz和/或218 GHz的2008年南方调查。通量密度跨度14-1700 mJy,我们使用的源光谱指数来自ACT的数据,将我们的源分为两个子群:167个由中央活动星系核(AGN)供电的射电星系,和24个尘埃恒星形成星系(DSFG)。我们交叉识别97%的源(166个活动星系核和19个DSFG)与现有目录中的源。当结合来自澳大利亚望远镜20千兆赫调查和澳大利亚望远镜紧凑阵列的后续观测的通量密度时,同步加速器占主导地位的人口被认为表现出从20到148千兆赫的光谱能量分布的斜率变陡,趋势继续到218千兆赫。ACT尘埃主导的源群的光谱指数中位数为3.7+0.62-0.86,包括本地星系和红移高达5.6的源。在现有的星表中没有对应的尘埃源可能属于最近发现的由前景星系或星系群透镜的DSFG亚群。

英文摘要:

We present a catalog of 191 extragalactic sources detected by the Atacama Cosmology Telescope (ACT) at 148 GHz and/or 218 GHz in the 2008 Southern survey. Flux densities span 14-1700 mJy, and we use source spectral indices derived using ACT-only data to divide our sources into two sub-populations: 167 radio galaxies powered by central active galactic nuclei (AGN), and 24 dusty star-forming galaxies (DSFGs). We cross-identify 97% of our sources (166 of the AGN and 19 of the DSFGs) with those in currently available catalogs. When combined with flux densities from the Australian Telescope 20 GHz survey and follow-up observations with the Australia Telescope Compact Array, the synchrotron-dominated population is seen to exhibit a steepening of the slope of the spectral energy distribution from 20 to 148 GHz, with the trend continuing to 218 GHz. The ACT dust-dominated source population has a median spectral index of 3.7+0.62-0.86, and includes both local galaxies and sources with redshifts as great as 5.6. Dusty sources with no counterpart in existing catalogs likely belong to a recently discovered subpopulation of DSFGs lensed by foreground galaxies or galaxy groups.

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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