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Title:Prospects for ▫$\gamma-ray$▫ observations of the Perseus galaxy cluster with the Cherenkov Telescope Array
Authors:ID Abe, K. (Author)
ID Bhattacharyya, Saptashwa (Author)
ID Pérez Romero, Judit (Author)
ID Stanič, Samo (Author)
ID Vodeb, Veronika (Author)
ID Vorobiov, Serguei (Author)
ID Zaharijas, Gabrijela (Author)
ID Zavrtanik, Danilo (Author)
ID Zavrtanik, Marko (Author)
ID Živec, Miha (Author), et al.
Files:.pdf Abe_2024_J._Cosmol._Astropart._Phys._2024_004.pdf (9,26 MB)
MD5: 2D34C259BB644DB35D83D82776C7A174
 
URL https://iopscience.iop.org/article/10.1088/1475-7516/2024/10/004
 
Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Galaxy clusters are expected to be both dark matter (DM) reservoirs and storage rooms for the cosmic-ray protons (CRp) that accumulate along the cluster’s formation history. Accordingly, they are excellent targets to search for signals of DM annihilation and decay at γ-ray energies and are predicted to be sources of large-scale γ-ray emission due to hadronic interactions in the intracluster medium (ICM). In this paper, we estimate the sensitivity of the Cherenkov Telescope Array (CTA) to detect diffuse γ-ray emission from the Perseus galaxy cluster. We first perform a detailed spatial and spectral modelling of the expected signal for both the DM and the CRp components. For each case, we compute the expected CTA sensitivity accounting for the CTA instrument response functions. The CTA observing strategy of the Perseus cluster is also discussed. In the absence of a diffuse signal (non-detection), CTA should constrain the CRp to thermal energy ratio X500 within the characteristic radius R500 down to about X500 < 0.003, for a spatial CRp distribution that follows the thermal gas and a CRp spectral index αCRp = 2.3. Under the optimistic assumption of a pure hadronic origin of the Perseus radio mini-halo and depending on the assumed magnetic field profile, CTA should measure αCRp down to about ∆αCRp ≃ 0.1 and the CRp spatial distribution with 10% precision, respectively. Regarding DM, CTA should improve the current ground-based γ-ray DM limits from clusters observations on the velocity- averaged annihilation cross-section by a factor of up to ∼ 5, depending on the modelling of DM halo substructure. In the case of decay of DM particles, CTA will explore a new region of the parameter space, reaching models with τχ > 10[sup]27 s for DM masses above 1 TeV. These constraints will provide unprecedented sensitivity to the physics of both CRp acceleration and transport at cluster scale and to TeV DM particle models, especially in the decay scenario.
Keywords:cosmic ray experiments, dark matter experiments, galaxy clusters, gamma ray experiments, very-high energy gamma rays, Cherenkov Telescope Array Observatory, Perseus galaxy cluster
Publication status:Published
Publication version:Version of Record
Publication date:01.10.2024
Year of publishing:2024
Number of pages:str. 1-103
Numbering:Vol. 2024, no. 10, [article no.] 004
COBISS.SI-ID:210822659 New window
UDC:52
ISSN on article:1475-7516
DOI:10.1088/1475-7516/2024/10/004 New window
NUK URN:URN:SI:UNG:REP:DEEUXI9Q
Publication date in RUNG:09.10.2024
Views:270
Downloads:1
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Record is a part of a journal

Title:Journal of cosmology and astroparticle physics
Publisher:Institute of Physics Pub.
ISSN:1475-7516
COBISS.SI-ID:389627 New window

Document is financed by a project

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:P1-0031
Name:Večglasniška astrofizika

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:P1-0385
Name:Daljinsko zaznavanje atmosferskih lastnosti

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:I0-0033
Name:Infrastrukturni program Univerze v Novi Gorici

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:J1-9146
Name:Novi detektorji in tehnike daljinskega zaznavanja atmosferskih lastnosti za polja Čerenkovih teleskopov

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:J1-1700
Name:Priprava na iskanje temne snovi z observatorijem Cherenkov Telescope Array z uporabo strojnega ucenja

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:N1-0111
Name:Identifikacija izvorov kozmičnih žarkov med aktivnimi galaksijami s curki

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

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