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arXiv 0904.1200astro-ph.CO
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BLAST:250、350和500微米宇宙远红外背景中的相关性揭示了恒星形成星系的聚集

BLAST: Correlations in the Cosmic Far-Infrared Background at 250, 350, and 500 microns Reveal Clustering of Star-Forming Galaxies

Marco P. Viero, Peter A. R. Ade, James J. Bock, Edward L. Chapin, Mark J. Devlin, Matthew Griffin, Joshua O. Gundersen, Mark Halpern, Peter C. Hargrave, David H… 展开作者

Marco P. Viero, Peter A. R. Ade, James J. Bock, Edward L. Chapin, Mark J. Devlin, Matthew Griffin, Joshua O. Gundersen, Mark Halpern, Peter C. Hargrave, David H. Hughes, Jeff Klein, Carrie J. MacTavish, Gaelen Marsden, Peter G. Martin, Philip Mauskopf, Lorenzo Moncelsi, Mattia Negrello, Calvin B. Netterfield, Luca Olmi, Enzo Pascale, Guillaume Patanchon, Marie Rex, Douglas Scott, Christopher Semisch, Nicholas Thomas, Matthew D. P. Truch, Carole Tucker, Gregory S. Tucker, Donald V. Wiebe

摘要:

我们检测到的相关性,在宇宙远红外背景下,由于恒星形成星系的集群在观测中所取得的与星载大孔径亚毫米望远镜,BLAST,在250,350,和500微米。我们执行折叠和其他测试来确认信号的真实性。测得的相关性在5-25弧分范围内符合幂律,Δ I/I = 15.1 +/-1.7%。我们采用了一个特定的亚毫米源模型,其中对聚类的贡献来自红移范围为1.3 <= z <= 2.2,1.5 <= z <= 2.7和1.7 <= z <= 3.2的源,分别在250,350和500微米。利用这些分布,我们对功率谱P(k_theta)的测量分别对应于线性偏置参数b = 3.8 +/- 0.6、3.9 +/- 0.6和4.4 +/- 0.7。我们进一步解释的晕模型的结果,并发现,在较小的尺度,最简单的晕模型无法拟合我们的结果。改善拟合的一种方法是增加模型中人为截断暗物质晕的半径,这相当于在z >= 1处有一些恒星形成星系位于星系群和星系团的外围。在这个模型的背景下,我们发现一个星系所需的最小晕质量是log(M_min / M_sun)= 11.5(+0.4/-0.1),我们推导出有效偏差$b_eff = 2.2 +/- 0.2,2.4 +/- 0.2和2.6 +/- 0.2,有效质量log在250、350和500微米处,(M_eff / M_sun)= 12.9 +/- 0.3、12.8 +/- 0.2和12.7 +/- 0.2,分别对应于空间相关长度r_0 = 4.9、5.0和5.2 +/- 0.7 h^-1 Mpc。最后,我们讨论了赫歇尔和普朗克对集群测量策略的影响。

英文摘要:

We detect correlations in the cosmic far-infrared background due to the clustering of star-forming galaxies in observations made with the Balloon-borne Large Aperture Submillimeter Telescope, BLAST, at 250, 350, and 500 microns. We perform jackknife and other tests to confirm the reality of the signal. The measured correlations are well fit by a power law over scales of 5-25 arcminutes, with Delta I/I = 15.1 +/- 1.7%. We adopt a specific model for submillimeter sources in which the contribution to clustering comes from sources in the redshift ranges 1.3 <= z <= 2.2, 1.5 <= z <= 2.7, and 1.7 <= z <= 3.2, at 250, 350, and 500 microns, respectively. With these distributions, our measurement of the power spectrum, P(k_theta), corresponds to linear bias parameters, b = 3.8 +/- 0.6, 3.9 +/- 0.6 and 4.4 +/- 0.7, respectively. We further interpret the results in terms of the halo model, and find that at the smaller scales, the simplest halo model fails to fit our results. One way to improve the fit is to increase the radius at which dark matter halos are artificially truncated in the model, which is equivalent to having some star-forming galaxies at z >= 1 located in the outskirts of groups and clusters. In the context of this model we find a minimum halo mass required to host a galaxy is log (M_min / M_sun) = 11.5 (+0.4/-0.1), and we derive effective biases $b_eff = 2.2 +/- 0.2, 2.4 +/- 0.2, and 2.6 +/- 0.2, and effective masses log (M_eff / M_sun) = 12.9 +/- 0.3, 12.8 +/- 0.2, and 12.7 +/- 0.2, at 250, 350, and 500 microns, corresponding to spatial correlation lengths of r_0 = 4.9, 5.0, and 5.2 +/- 0.7 h^-1 Mpc, respectively. Finally, we discuss implications for clustering measurement strategies with Herschel and Planck.

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