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arXiv 1906.00516astro-ph.COastro-ph.GA
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光度测量中投影星系团的精确模拟:I。模拟目录测试

Accurate Modeling of the Projected Galaxy Clustering in Photometric Surveys: I. Tests with Mock Catalogs

Zhaoyu Wang, Haojie Xu, Xiaohu Yang, Y. P. Jing, Hong Guo, Zheng Zheng, Ying Zu, Zhigang Li, Chengze Liu

摘要:

我们发展了一种新的方法来探索星系晕的连接使用星系成像巡天通过建模的投影两点关联函数测量从星系合理的光度红移测量。通过假设测光红移误差的高斯形式,我们能够同时约束晕占据分布(HOD)模型和有效的测光红移不确定性。模拟星系表的测试表明,该方法可以成功地恢复(在$\sim 1σ$)的内在大尺度星系的偏差,以及HOD模型和有效的光度红移的不确定性。这种方法即使对光度红移误差为10%的星系样本也能很好地工作。

英文摘要:

We develop a novel method to explore the galaxy-halo connection using the galaxy imaging surveys by modeling the projected two-point correlation function measured from the galaxies with reasonable photometric redshift measurements. By assuming a Gaussian form of the photometric redshift errors, we are able to simultaneously constrain the halo occupation distribution (HOD) models and the effective photometric redshift uncertainties. Tests with mock galaxy catalogs demonstrate that this method can successfully recover (within $\sim 1σ$) the intrinsic large-scale galaxy bias, as well as the HOD models and the effective photometric redshift uncertainty. This method also works well even for galaxy samples with 10 per cent catastrophic photometric redshift errors.

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