[1909.02179] Probing Cosmology and Cluster Astrophysics with Multi-Wavelength Surveys I. Correlation Statistics

Authors:  Masato Shirasaki, Erwin T. Lau, Daisuke Nagai
Abstract:  Upcoming multi-wavelength astronomical surveys will soon discover all massive galaxy clusters and provide unprecedented constraints on cosmology and cluster astrophysics. In this paper, we investigate the constraining power of the multi-band cluster surveys, through a joint analysis of three observables associated with clusters of galaxies, including thermal Sunyaev-Zel'dovich (tSZ) effect in cosmic microwave background (CMB), X-ray emission of ionized gas, and gravitational weak lensing effect of background galaxies by the cluster's gravitational potential. We develop a theoretical framework to predict and interpret two-point correlation statistics among the three observables using a semi-analytic model of intracluster medium (ICM) and halo-based approach. In this work, we show that the auto- and cross-angular power spectra in tSZ, X-ray and lensing statistics from upcoming missions (eROSITA, CMB-S4, and LSST) can help break the degeneracy between cosmology and ICM physics. These correlation statistics are less sensitive to selection biases, and are able to probe ICM physics in distant, faint and small clusters that are otherwise difficult to be detected individually. We show that the correlation statistics are able to provide cosmological constraints complementary to the conventional cluster abundance measurements, while constraining cluster astrophysics at the same time. Our results indicate that the correlation statistics can significantly enhance the scientific returns of upcoming multi-wavelength cluster surveys.
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[1909.02179] Probing Cosmology and Cluster Astrophysics with Multi-Wavelength Surveys I. Correlation Statistics

Post by Cosmo Comments » September 17 2019

This paper was commented on through Cosmo Comments. The following comments can also be viewed as annotations on the paper via Hypothesis.

This paper explores the exciting possibility of jointly analyzing muti-wavelength galaxy cluster survey data, through examining the correlation statistics between tSZ, x-ray and lensing observations. The paper is written in light of the eRosita, CMB-S4 and LSST experiments and shows that combining data from the three probes would greatly improve cosmology and cluster astrophysics constraints.

As the authors pointed out, there are effects that are not yet considered in their formalism (and this modesty is really admirable). Nevertheless, the work is timely, inspiring and insightful. I learned a great deal from this paper and am really looking forward to seeing the forthcoming papers.

I do have a quick question. The paper is written in the context of “galaxy cluster surveys”, but finding galaxy clusters didn’t seem necessary in the observations/models that the paper describes. What is the direct relevance of the study to “galaxy clusters”, is it the angular scale that the study focuses on?

[These comments were shared with us by a member of the cosmology community. They do not necessarily reflect the opinion of the Cosmo Comments team.]

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