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arXiv 1905.04592astro-ph.GAastro-ph.CO
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阿塔卡马宇宙学望远镜:赤道巡天中的尘埃恒星形成星系和活动星系核

Atacama Cosmology Telescope: Dusty star-forming galaxies and active galactic nuclei in the equatorial survey

Megan B. Gralla, Tobias A. Marriage, Graeme Addison, Andrew J. Baker, J. Richard Bond, Devin Crichton, Rahul Datta, Mark J. Devlin, Joanna Dunkley, Rolando Dünn… 展开作者

Megan B. Gralla, Tobias A. Marriage, Graeme Addison, Andrew J. Baker, J. Richard Bond, Devin Crichton, Rahul Datta, Mark J. Devlin, Joanna Dunkley, Rolando Dünner, Joseph Fowler, Patricio A. Gallardo, Kirsten Hall, Mark Halpern, Matthew Hasselfield, Matt Hilton, Adam D. Hincks, Kevin M. Huffenberger, John P. Hughes, Arthur Kosowsky, Carlos H. López-Caraballo, Thibaut Louis, Danica Marsden, Kavilan Moodley, Michael D. Niemack, Lyman A. Page, Bruce Partridge, Jesus Rivera, Jonathan L. Sievers, Suzanne Staggs, Ting Su, Daniel Swetz, Edward J. Wollack

摘要:

我们提出了一个510射电大声活动星系核的目录阿塔卡马宇宙学望远镜以$>5σ$显著性在以148 GHz(2 mm)、218 GHz(1.5 mm)和218 GHz(1.5 mm)为中心的波段探测到的AGN(主要是耀变体)和287个尘埃恒星形成星系(DSFG)。(1.4 mm)和277 GHz(1.1 mm),从一个480平方度的天球赤道带与额外的(360平方度)浅场。将最深的218 GHz宽场成像、277 GHz数据和多频带滤波相结合,可产生迄今为止最灵敏的宽场毫米波DSFG选择,以218 GHz为基准的均方根噪声达到$<2$ mJy。我们开发了从河外目录中删除银河污染的技术,产生了321个额外的银河源。我们采用了一种新的通量去偏置方法,处理由于银河系切割的异质样本选择。我们提出的光谱特性和源计数的活动星系核和DSFG。DSFG光谱偏离218 GHz和277 GHz之间的光学薄改性黑体,与光学厚发射或额外的冷尘埃成分一致。对于亮活动星系核,通量密度与源变率的年际均方根分数偏差为$\sim40\%$。我们报告了活动星系核的8个$-$ 2870 mJy源计数和DSFG的8个$-$ 90 mJy源计数,后者探测了较亮的透镜群和较暗的非透镜群。在277 GHz,我们报告的第一个源计数测量在这些通量密度,发现超过大多数模型计数预测。最后,我们选择了30个最亮的DSFG作为候选高$z$透镜系统的多频研究。

英文摘要:

We present a catalog of 510 radio-loud active galactic nuclei (AGN, primarily blazars) and 287 dusty star-forming galaxies (DSFGs) detected by the Atacama Cosmology Telescope at $>5σ$ significance in bands centered on 148 GHz (2 mm), 218 GHz (1.4 mm) and 277 GHz (1.1 mm), from a 480 square degrees strip on the celestial equator with additional (360 square degrees) shallower fields. Combining the deepest available 218 GHz wide-field imaging, 277 GHz data, and multi-band filtering yields the most sensitive wide-field millimeter-wave DSFG selection to date with rms noise referenced to 218 GHz reaching $<2$ mJy. We developed techniques to remove Galactic contamination from the extragalactic catalog, yielding 321 additional Galactic sources. We employ a new flux debiasing method that handles the heterogeneous sample selection due to Galactic cuts. We present spectral properties and source counts of the AGN and DSFGs. The DSFG spectra depart from an optically thin modified blackbody between 218 GHz and 277 GHz, consistent with optically thick emission or an additional cold dust component. For bright AGN, the inter-year RMS fractional deviation in flux density from source variability is $\sim40\%$. We report 8$-$2870 mJy source counts for AGN and 8$-$90 mJy source counts for DSFGs, the latter probing both the brighter, lensed population and the fainter, unlensed population. At 277 GHz we report the first source counts measurements at these flux densities, finding an excess above most model count predictions. Finally, we select thirty of the brightest DSFGs for multi-frequency study as candidate high-$z$ lensed systems.

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