arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.0833astro-ph.CO
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BLAST数据中250、350和500微米处的亚毫米数计数

Submillimeter Number Counts at 250, 350 and 500 microns in BLAST data

M. Béthermin, H. Dole, M. Cousin, N. Bavouzet

摘要:

BLAST(星载大孔径亚毫米望远镜)在250、350和500微米进行了第一次深宽的河外巡天。在这些波长的河外星系数计数是模拟红外星系演化的重要约束。[...]我们使用三种方法来识别亚毫米波源。1)盲提取。[...]测光计算采用一种新的简单快速的PSF拟合程序(FASTPHOT)。[...] 2)与Prior一起提取。[...] 3)叠加分析。[...]在盲提取的情况下,我们分别达到97,83和76 mJy。250、350和500 um,完整性为95%。与先前的提取,我们达到76 mJy(分别。63和49 mJy)在250 um(分别350和500 um)。通过叠加分析,我们达到6.2 mJy(分别为5.2和3.5mJy)在250 μ m(分别350和500 um)。微分亚毫米波计数的推导,并开始显示营业额在通量密度随波长增加而减少。与Patanchon等人(2009)的P(D)分析非常一致。在亮通量(> 100 mJy)时,Lagache等人(2004)和Le Borgne等人(2009)的模型略微高估了观测到的计数,但在微分数计数的峰值附近有非常好的一致性。[...]计数可在以下网址获得:www.example.com

英文摘要:

BLAST (Balloon-borne Large-Aperture Submillimeter Telescope) performed the first deep and wide extragalactic survey at 250, 350 and 500 um. The extragalactic number counts at these wavelengths are important constraints for modeling the infrared galaxies evolution. [...] We use three methods to identify the submillimeter sources. 1) Blind extraction. [...] The photometry is computed with a new simple and quick PSF fitting routine (FASTPHOT). [...] 2) Extraction with prior. [...] 3) A stacking analysis. [...] With the blind extraction, we reach 97, 83 and 76 mJy at resp. 250, 350 and 500 um with a 95% completeness. With the prior extraction, we reach 76 mJy (resp. 63 and 49 mJy) at 250 um (resp. 350 and 500 um). With the stacking analysis, we reach 6.2 mJy (resp. 5.2 and 3.5 mJy) at 250 um (resp. 350 and 500 um). The differential submillimeter number counts are derived, and start showing a turnover at flux densities decreasing with increasing wavelength. There is a very good agreement with the P(D) analysis of Patanchon et al. (2009). At bright fluxes (>100 mJy), the Lagache et al. (2004) and Le Borgne et al. (2009) models slightly overestimate the observed counts, but there is a very good agreement near the peak of differential number counts. [...] Counts are available at: http://www.ias.u-psud.fr/irgalaxies/downloads.php

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