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http://hdl.handle.net/20.500.12386/35628
Title: | CHEX-MATE: Pressure profiles of six galaxy clusters as seen by SPT and Planck | Authors: | Oppizzi, F. De Luca, F. Bourdin, H. Mazzotta, P. ETTORI, STEFANO GASTALDELLO, Fabio Kay, S. Lovisari, L. Maughan, B. J. Pointecouteau, E. Pratt, G. W. ROSSETTI, Mariachiara Sayers, J. SERENO, Mauro |
Issue Date: | 2023 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 672 | First Page: | A156 | Abstract: | Context. Pressure profiles are sensitive probes of the thermodynamic conditions and the internal structure of galaxy clusters. The intra-cluster gas resides in hydrostatic equilibrium within the dark-matter gravitational potential. However, this equilibrium may be perturbed; for example, as a consequence of thermal energy losses, feedback, and non-thermal pressure supports. Accurate measures of the gas pressure over cosmic time are crucial for constraining cluster evolution as well as the contributions from astrophysical processes. <BR /> Aims: In this work we present a novel algorithm for deriving the pressure profiles of galaxy clusters from the Sunyaev-Zeldovich (SZ) signal measured on a combination of Planck and South Pole Telescope (SPT) observations. The synergy of the two instruments makes it possible to track the profiles on a wide range of spatial scales. We exploited the sensitivity of the Planck High-Frequency Instrument to the larger scales in order to observe the faint peripheries, and took advantage of the higher spatial resolution of SPT to solve the innermost regions. <BR /> Methods: We developed a two-step pipeline to take advantage of the specifications of each instrument. We first performed a component separation on the two data sets separately in order to remove the background (CMB) and foreground (Galactic emission) contaminants. We then jointly fitted a parametric pressure profile model on a combination of Planck and SPT data. <BR /> Results: We validated our technique on a sample of six CHEX-MATE clusters detected by SPT. We compare the results of the SZ analysis with profiles derived from X-ray observations with XMM-Newton. We find excellent agreement between these two independent probes of the gas pressure structure. | URI: | http://hdl.handle.net/20.500.12386/35628 | URL: | http://arxiv.org/abs/2209.09601v1 https://www.aanda.org/articles/aa/full_html/2023/04/aa45012-22/aa45012-22.html |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/202245012 | Bibcode ADS: | 2023A&A...672A.156O | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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aa45012-22.pdf | Pdf editoriale | 2.02 MB | Adobe PDF | View/Open |
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