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arXiv 2009.02308astro-ph.CO
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DESI遗留成像巡天中eBOSS DR16类星体和测光星系之间投影互相关联函数中的重子声学振荡

Baryon Acoustic Oscillations in the projected cross-correlation function between the eBOSS DR16 quasars and photometric galaxies from the DESI Legacy Imaging Surveys

Pauline Zarrouk, Mehdi Rezaie, Anand Raichoor, Ashley J. Ross, Shadab Alam, Robert Blum, David Brookes, Chia-Hsun Chuang, Shaun Cole, Kyle S. Dawson, Daniel J. … 展开作者

Pauline Zarrouk, Mehdi Rezaie, Anand Raichoor, Ashley J. Ross, Shadab Alam, Robert Blum, David Brookes, Chia-Hsun Chuang, Shaun Cole, Kyle S. Dawson, Daniel J. Eisenstein, Robert Kehoe, Martin Landriau, John Moustakas, Adam D. Myers, Peder Norberg, Will J. Percival, Francisco Prada, Michael Schubnell, Hee-Jong Seo, Gregory Tarlé, Cheng Zhao

摘要:

我们在SDSS-IV DR 16 eBOSS类星体和从DESI遗产成像巡天中选择的密集光度计星系样本之间的投影交叉关联函数中搜索重子声学振荡。我们估计在这个红移范围内的星系测光样本的密度约为2900度$^{-2}$,这是比官方DESI ELG选择更深,光谱样本的密度约为20度$^{-2}$。为了减轻与使用接近检测极限的不同成像调查相关的系统性,我们使用了一种神经网络方法,该方法考虑了成像属性和观测到的星系密度之间的复杂依赖关系。我们发现,我们是有限的成像调查的深度,影响的光度计样品的密度和纯度和重叠的红移与类星体样品,从而影响该方法的性能。当将测光星系与$0.6 \leq z \leq 1.2$中的类星体进行互相关时,与从自相关中获得的球平均距离$D_{\rm V}$(9%精度)的约束相比,互相关联函数可以对同动角距离$D_{\rm M}$(6%精度)提供更好的约束。虽然还没有竞争力,这项技术将受益于即将到来的调查,这将使它能够超越目前的限制,我们已经确定在这项工作中更深的光度数据的到来。

英文摘要:

We search for the Baryon Acoustic Oscillations in the projected cross-correlation function binned into transverse comoving radius between the SDSS-IV DR16 eBOSS quasars and a dense photometric sample of galaxies selected from the DESI Legacy Imaging Surveys. We estimate the density of the photometric sample of galaxies in this redshift range to be about 2900 deg$^{-2}$, which is deeper than the official DESI ELG selection, and the density of the spectroscopic sample is about 20 deg$^{-2}$. In order to mitigate the systematics related to the use of different imaging surveys close to the detection limit, we use a neural network approach that accounts for complex dependencies between the imaging attributes and the observed galaxy density. We find that we are limited by the depth of the imaging surveys which affects the density and purity of the photometric sample and its overlap in redshift with the quasar sample, which thus affects the performance of the method. When cross-correlating the photometric galaxies with quasars in $0.6 \leq z \leq 1.2$, the cross-correlation function can provide better constraints on the comoving angular distance, $D_{\rm M}$ (6\% precision) compared to the constraint on the spherically-averaged distance $D_{\rm V}$ (9\% precision) obtained from the auto-correlation. Although not yet competitive, this technique will benefit from the arrival of deeper photometric data from upcoming surveys which will enable it to go beyond the current limitations we have identified in this work.

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