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arXiv 1005.2409astro-ph.CO
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赫歇尔-阿特拉斯:从250到500微米的河外星系数计数

The Herschel-ATLAS: Extragalactic Number Counts from 250 to 500 Microns

D. L. Clements, E. Rigby, S. Maddox, L. Dunne, A. Mortier, C. Pearson, A. Amblard, R. Auld, M. Baes, D. Bonfield, D. Burgarella, S. Buttiglione, A. Cava, A. Coo… 展开作者

D. L. Clements, E. Rigby, S. Maddox, L. Dunne, A. Mortier, C. Pearson, A. Amblard, R. Auld, M. Baes, D. Bonfield, D. Burgarella, S. Buttiglione, A. Cava, A. Cooray, A. Dariush, G. de Zotti, S. Dye, S. Eales, D. Frayer, J. Fritz, Jonathan P. Gardner, J. Gonzalez-Nuevo, D. Herranz, E. Ibar, R. Ivison, M. J. Jarvis, G. Lagache, L. Leeuw, M. Lopez-Caniego, M. Negrello, E. Pascale, M. Pohlen, G. Rodighiero, S. Samui, S. Serjeant, B. Sibthorpe, Douglas Scott, D. J. B. Smith, P. Temi, M. Thompson, I. Valtchanov, P. van der Werf, A. Verma

摘要:

目标。Herschel-ATLAS巡天(H-ATLAS)将是Herschel空间天文台进行的最大面积的巡天。它将覆盖550平方米。°的完成后,将在100、160、250、350和500微米波长处观测河外天空,达到32至145 mJy的通量极限(5 sigma)。在这里,我们提出的星系数计数获得的SPIRE观测的第一个~14平方。°的在250、350和500微米处观察。方法.计数是限制星系演化模型的基本工具。我们使用源目录提取的H-ATLAS地图作为这样的分析的基础。完整性和通量提升的校正因子是通过将我们的提取方法应用于模型目录,然后应用于原始观测计数而得出的。结果我们发现在所有三个SPIRE带中,在100- 200 mJy的通量水平下,数量计数急剧上升,与BLAST的结果一致。这些计数与一系列星系演化模型进行了比较。目前没有一个模型是一个理想的适合的数据,但所有归因于人口的急剧上升,发光,迅速演变的尘埃星系在中等到高的红移。

英文摘要:

Aims. The Herschel-ATLAS survey (H-ATLAS) will be the largest area survey to be undertaken by the Herschel Space Observatory. It will cover 550 sq. deg. of extragalactic sky at wavelengths of 100, 160, 250, 350 and 500 microns when completed, reaching flux limits (5 sigma) from 32 to 145mJy. We here present galaxy number counts obtained for SPIRE observations of the first ~14 sq. deg. observed at 250, 350 and 500 microns. Methods. Number counts are a fundamental tool in constraining models of galaxy evolution. We use source catalogs extracted from the H-ATLAS maps as the basis for such an analysis. Correction factors for completeness and flux boosting are derived by applying our extraction method to model catalogs and then applied to the raw observational counts. Results. We find a steep rise in the number counts at flux levels of 100-200mJy in all three SPIRE bands, consistent with results from BLAST. The counts are compared to a range of galaxy evolution models. None of the current models is an ideal fit to the data but all ascribe the steep rise to a population of luminous, rapidly evolving dusty galaxies at moderate to high redshift.

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