| Texto completo | |
| Autor(es): Mostrar menos - |
Richard-Laferriere, A.
[1, 2]
;
Hlavacek-Larrondo, J.
[2]
;
Nemmen, R. S.
[3]
;
Rhea, C. L.
[2]
;
Taylor, G. B.
[4]
;
Prasow-Emond, M.
[2]
;
Gendron-Marsolais, M.
[5]
;
Latulippe, M.
[2]
;
Edge, A. C.
[6]
;
Fabian, A. C.
[1]
;
Sanders, J. S.
[7]
;
Hogan, M. T.
[8, 9]
;
Demontigny, G.
[2]
Número total de Autores: 13
|
| Afiliação do(s) autor(es): | [1] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA - England
[2] Univ Montreal, Dept Phys, CP 6128 Succ Ctr Ville, Montreal, PQ H3C 3J7 - Canada
[3] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, BR-05508090 Sao Paulo - Brazil
[4] Univ New Mexico, Dept Phys & Astron, 1919 Lomas Blvd NE, Albuquerque, NM 87131 - USA
[5] European Southern Observ, Alonso de Cordova 3107, Casilla 19001, Santiago - Chile
[6] Univ Durham, Dept Phys, South Rd, Durham DH1 3LE - England
[7] Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching - Germany
[8] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5 - Canada
[9] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1 - Canada
Número total de Afiliações: 9
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 499, n. 2, p. 2934-2958, DEC 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
A variety of large-scale diffuse radio structures have been identified in many clusters with the advent of new state-of-the-art facilities in radio astronomy. Among these diffuse radio structures, radio mini-halos are found in the central regions of cool core clusters. Their origin is still unknown and they are challenging to discover; less than 30 have been published to date. Based on new VLA observations, we confirmed the mini-halo in the massive strong cool core cluster PKS 0745-191 (z = 0.1028) and discovered one in the massive cool core cluster MACS J1447.4+0827 (z = 0.3755). Furthermore, using a detailed analysis of all known mini-halos, we explore the relation between mini-halos and active galactic nucleus (AGN) feedback processes from the central galaxy. We find evidence of strong, previously unknown correlations between mini-halo radio power and X-ray cavity power, and between mini-halo and the central galaxy radio power related to the relativistic jets when spectrally decomposing the AGN radio emission into a component for past outbursts and one for ongoing accretion. Overall, our study indicates that mini-halos are directly connected to the central AGN in clusters, following previous suppositions. We hypothesize that AGN feedback may be one of the dominant mechanisms giving rise to mini-halos by injecting energy into the intra-cluster medium and reaccelerating an old population of particles, while sloshing motion may drive the overall shape of mini-halos inside cold fronts. AGN feedback may therefore not only play a vital role in offsetting cooling in cool core clusters, but may also play a fundamental role in re-energizing non-thermal particles in clusters. (AU) | |
| Processo FAPESP: | 17/01461-2 - O universo extremo: buracos negros e o telescópio Fermi |
| Beneficiário: | Rodrigo Nemmen da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |