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http://hdl.handle.net/20.500.12386/29740
Title: | Reconstruction of the two-dimensional gravitational potential of galaxy clusters from X-ray and Sunyaev-Zel'dovich measurements | Authors: | Tchernin, C. Bartelmann, M. Huber, K. Dekel, A. Hurier, G. Majer, C. L. Meyer, S. Zinger, E. Eckert, D. MENEGHETTI, MASSIMO Merten, J. |
Issue Date: | 2018 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 614 | First Page: | A38 | Abstract: | Context. The mass of galaxy clusters is not a direct observable, nonetheless it is commonly used to probe cosmological models. Based on the combination of all main cluster observables, that is, the X-ray emission, the thermal Sunyaev-Zel'dovich (SZ) signal, the velocity dispersion of the cluster galaxies, and gravitational lensing, the gravitational potential of galaxy clusters can be jointly reconstructed. <BR /> Aims: We derive the two main ingredients required for this joint reconstruction: the potentials individually reconstructed from the observables and their covariance matrices, which act as a weight in the joint reconstruction. We show here the method to derive these quantities. The result of the joint reconstruction applied to a real cluster will be discussed in a forthcoming paper. <BR /> Methods: We apply the Richardson-Lucy deprojection algorithm to data on a two-dimensional (2D) grid. We first test the 2D deprojection algorithm on a β-profile. Assuming hydrostatic equilibrium, we further reconstruct the gravitational potential of a simulated galaxy cluster based on synthetic SZ and X-ray data. We then reconstruct the projected gravitational potential of the massive and dynamically active cluster Abell 2142, based on the X-ray observations collected with XMM-Newton and the SZ observations from the Planck satellite. Finally, we compute the covariance matrix of the projected reconstructed potential of the cluster Abell 2142 based on the X-ray measurements collected with XMM-Newton. <BR /> Results: The gravitational potentials of the simulated cluster recovered from synthetic X-ray and SZ data are consistent, even though the potential reconstructed from X-rays shows larger deviations from the true potential. Regarding Abell 2142, the projected gravitational cluster potentials recovered from SZ and X-ray data reproduce well the projected potential inferred from gravitational-lensing observations. We also observe that the covariance matrix of the potential for Abell 2142 reconstructed from XMM-Newton data sensitively depends on the resolution of the deprojected grid and on the smoothing scale used in the deprojection. <BR /> Conclusions: We show that the Richardson-Lucy deprojection method can be effectively applied on a grid and that the projected potential is well recovered from real and simulated data based on X-ray and SZ signal. The comparison between the reconstructed potentials from the different observables provides additional information on the validity of the assumptions as function of the projected radius. | URI: | http://hdl.handle.net/20.500.12386/29740 | URL: | https://www.aanda.org/articles/aa/full_html/2018/06/aa29364-16/aa29364-16.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201629364 | Bibcode ADS: | 2018A&A...614A..38T | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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aa29364-16.pdf | PDF editoriale | 6.3 MB | Adobe PDF | View/Open |
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