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arXiv 1502.06456astro-ph.CO
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阿塔卡马宇宙学望远镜:通过与透镜的互相关测量射电星系偏差

The Atacama Cosmology Telescope: measuring radio galaxy bias through cross-correlation with lensing

Rupert Allison, Sam N. Lindsay, Blake D. Sherwin, Francesco de Bernardis, J. Richard Bond, Erminia Calabrese, Mark J. Devlin, Joanna Dunkley, Patricio Gallardo,… 展开作者

Rupert Allison, Sam N. Lindsay, Blake D. Sherwin, Francesco de Bernardis, J. Richard Bond, Erminia Calabrese, Mark J. Devlin, Joanna Dunkley, Patricio Gallardo, Shawn Henderson, Adam D. Hincks, Renee Hlozek, Matt Jarvis, Arthur Kosowsky, Thibaut Louis, Mathew Madhavacheril, Jeff McMahon, Kavilan Moodley, Sigurd Naess, Laura Newburgh, Michael D. Niemack, Lyman A. Page, Bruce Partridge, Neelima Sehgal, David N. Spergel, Suzanne T. Staggs, Alexander van Engelen, Edward J. Wollack

摘要:

我们将FIRST巡天中射电星系的位置与阿塔卡玛宇宙学望远镜估计的470平方度以上的CMB透镜会聚相关联,以确定这些星系的偏差。我们删除光学交叉匹配的源低于红移$z=0.2$优先选择活动星系核(AGN)。我们测量的角度交叉功率谱$C_l^{κg}$在$4.4σ$意义上的多极范围$100<l<3000$,对应于物理尺度之间的$\approx$ 2- 60兆秒差距在一个有效的红移$z_{\rm eff}= 1.5$。用红移相关的偏置模型模拟活动星系核,交叉谱与普朗克最佳拟合的$Λ$ CDM宇宙学模型拟合得很好。修正宇宙学,我们适合整体偏差模型归一化,发现$b(z_{\rm eff}) = 3.5 \pm 0.8$为整个星系样本,和$b(z_{\rm eff})=4.0\pm1.1 (3.0\pm1.1)$的来源明亮(暗淡)比2.5 mJy。这种测量表征了射电活动星系核的典型晕质量:我们发现了$\log(M_{\rm halo} / M_\odot) = 13.6^{+0.3}_{-0.4}$。

英文摘要:

We correlate the positions of radio galaxies in the FIRST survey with the CMB lensing convergence estimated from the Atacama Cosmology Telescope over 470 square degrees to determine the bias of these galaxies. We remove optically cross-matched sources below redshift $z=0.2$ to preferentially select Active Galactic Nuclei (AGN). We measure the angular cross-power spectrum $C_l^{κg}$ at $4.4σ$ significance in the multipole range $100<l<3000$, corresponding to physical scales between $\approx$ 2--60 Mpc at an effective redshift $z_{\rm eff}= 1.5$. Modelling the AGN population with a redshift-dependent bias, the cross-spectrum is well fit by the Planck best-fit $Λ$CDM cosmological model. Fixing the cosmology we fit for the overall bias model normalization, finding $b(z_{\rm eff}) = 3.5 \pm 0.8$ for the full galaxy sample, and $b(z_{\rm eff})=4.0\pm1.1 (3.0\pm1.1)$ for sources brighter (fainter) than 2.5 mJy. This measurement characterizes the typical halo mass of radio-loud AGN: we find $\log(M_{\rm halo} / M_\odot) = 13.6^{+0.3}_{-0.4}$.

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