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arXiv 1401.4094astro-ph.CO
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Herschel-ATLAS/GAMA:弱透镜诱导的SDSS互相关

Herschel-ATLAS/GAMA: SDSS cross-correlation induced by weak lensing

J. González-Nuevo, A. Lapi, M. Negrello, L. Danese, G. De Zotti, S. Amber, M. Baes, J. Bland-Hawthorn, N. Bourne, S. Brough, R. S. Bussmann, Z. -Y. Cai, A. Coor… 展开作者

J. González-Nuevo, A. Lapi, M. Negrello, L. Danese, G. De Zotti, S. Amber, M. Baes, J. Bland-Hawthorn, N. Bourne, S. Brough, R. S. Bussmann, Z. -Y. Cai, A. Cooray, S. P. Driver, L. Dunne, S. Dye, S. Eales, E. Ibar, R. Ivison, J. Liske, J. Loveday, S. Maddox, M. J. Michałowski, A. S. G. Robotham, D. Scott, M. W. L. Smith, E. Valiante, J. -Q. Xia

摘要:

我们报告了在\textsl{Herschel}天体物理太赫兹大区域巡天(H-ATLAS)的赤道场中检测到的具有$S_{350μ\rm m}\ge 30\,$ mJy的星系之间高度显着($>10σ$)的空间相关性,并估计了红移$\gtrsim 1.5$,以及$0.2\le z\le 0.6$的SDSS或GAMA星系。互相关的意义是远远高于那些迄今为止报道的样品与非重叠的红移分布选择在其他波段。广泛的,现实的模拟放大的前景结构的群集亚毫米星系证实,互相关解释弱引力透镜($μ<2$)。模拟还表明,测量到的信号的幅度和角度尺度的范围大于可以解释的星系-星系弱透镜。然而,对于尺度$\lesssim 2\,$ arcmin,信号可以再现,如果SDSS/GAMA星系作为路标的星系群/星系团的晕质量范围$10^{13.2}$ - $10^{14.5} M_{\odot}$。在较大尺度上探测到的信号似乎反映了这种晕的聚集。

英文摘要:

We report a highly significant ($>10σ$) spatial correlation between galaxies with $S_{350μ\rm m}\ge 30\,$mJy detected in the equatorial fields of the \textsl{Herschel} Astrophysical Terahertz Large Area Survey (H-ATLAS) with estimated redshifts $\gtrsim 1.5$, and SDSS or GAMA galaxies at $0.2\le z\le 0.6$. The significance of the cross-correlation is much higher than those reported so far for samples with non-overlapping redshift distributions selected in other wavebands. Extensive, realistic simulations of clustered sub-mm galaxies amplified by foreground structures confirm that the cross-correlation is explained by weak gravitational lensing ($μ<2$). The simulations also show that the measured amplitude and range of angular scales of the signal are larger than can be accounted for by galaxy-galaxy weak lensing. However, for scales $\lesssim 2\,$arcmin, the signal can be reproduced if SDSS/GAMA galaxies act as signposts of galaxy groups/clusters with halo masses in the range $10^{13.2}$--$10^{14.5} M_{\odot}$. The signal detected on larger scales appears to reflect the clustering of such halos.

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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