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Cold fronts and metal anisotropies in the X-ray cool core of the galaxy cluster Zw 1742+3306

Ettori, S.; Gastaldello, F.; Gitti, M.; O'Sullivan, E.; Gaspari, M.; Brighenti, F.; David, L.; Edge, A.C.

Cold fronts and metal anisotropies in the X-ray cool core of the galaxy cluster Zw 1742+3306 Thumbnail


Authors

S. Ettori

F. Gastaldello

M. Gitti

E. O'Sullivan

M. Gaspari

F. Brighenti

L. David



Abstract

Context. In recent years, our understanding of the cool cores of galaxy clusters has changed. Once thought to be relatively simple places where gas cools and flows towards the centre, now they are believed to be very dynamic places where heating from the central active galactic nucleus (AGN) and cooling, as inferred from active star formation, molecular gas, and Hα nebulosity, find an uneasy energetic balance. Aims. We want to characterize the X-ray properties of the nearby cool-core cluster Zw 1742+3306, selected because it is bright at X-ray (with a flux greater than 10-11 erg s-1 cm-2 in the 0.1–2.4 keV band) and Hα wavelengths (Hα luminosity >1040 erg s-1). Methods. We used Chandra data to analyse the spatial and spectral properties of the cool core of Zw 1742+3306, a galaxy cluster at z = 0.0757 that emits in Hα and presents the brightest central galaxy located in a diffuse X-ray emission with multiple peaks in surface brightness. Results. We show that the X-ray cool core of the galaxy cluster Zw 1742+3306 is thermodynamically very active with evidence of cold fronts and a weak shock in the surface brightness map and of an apparently coherent, elongated structure with metallicity greater than the value measured in the surrounding ambient gas by about 50%. This anisotropic structure is 280 × 90 kpc2 and is aligned with the cold fronts and with the X-ray emission on larger scales. We suggest that all these peculiarities in the X-ray emission of Zw 1742+3306 are either a very fine-tuned output of a sloshing gas in the cluster core or the product of a metal-rich outflow from the central AGN.

Citation

Ettori, S., Gastaldello, F., Gitti, M., O'Sullivan, E., Gaspari, M., Brighenti, F., …Edge, A. (2013). Cold fronts and metal anisotropies in the X-ray cool core of the galaxy cluster Zw 1742+3306. Astronomy & Astrophysics, 555, Article A93. https://doi.org/10.1051/0004-6361/201321107

Journal Article Type Article
Publication Date Jul 5, 2013
Deposit Date Apr 3, 2014
Publicly Available Date Mar 29, 2024
Journal Astronomy and astrophysics.
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 555
Article Number A93
DOI https://doi.org/10.1051/0004-6361/201321107
Keywords Galaxies: clusters: general, Galaxies: clusters: individual: Zw 1742+3306, Galaxies: clusters: intracluster medium, X-rays: galaxies: clusters.

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Copyright Statement
Reproduced with permission from Astronomy & Astrophysics, © ESO





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