Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/3965
Title: The complex intracluster medium of Abell 1569 and its interaction with central radio galaxies
Authors: Tiwari, Juhi
Singh, K.P.
Keywords: X-ray emission
Galaxy cluster
Abell 1569
Central radio galaxies
Issue Date: 2021
Publisher: Oxford Academic
Citation: Monthly Notices of the Royal Astronomical Society,509(3):3321–3338.
Abstract: We present the first in-depth study of X-ray emission from a nearby (z ∼ 0.0784) galaxy cluster Abell 1569 using an archival Chandra observation. A1569 consists of two unbound subclusters – a northern subcluster (A1569N) hosting a double-lobed radio galaxy 1233+169 at its centre, and a southern subcluster (A1569S) harbouring a wide-angle-tailed (WAT) radio source 1233+168. X-ray emission from A1569N and A1569S extends to a radius r ∼248 kpc and r ∼370 kpc, respectively, indicating that the two gas clumps are group-scale systems. The two subclusters have low X-ray luminosities (∼1042–43 erg s−1), average elemental abundances ∼1/4 Z⊙, low average temperatures (∼2 keV), and lack large (r ≳ 40–50 kpc) cool cores associated with the intracluster gas. We detect a pair of cavities coincident with the radio lobes of 1233+169 in A1569N. The total mechanical power associated with the cavity pair is an order of magnitude larger than the X-ray radiative loss in the cavity-occupied region, providing corroborating evidence for cavity-induced heating of the intragroup gas in A1569N. A1569S exhibits possible evidence for a small-scale cluster-subcluster merger, as indicated by its high central entropy, and the presence of local gas elongation and a density discontinuity in between the bent radio tails of 1233+168. The discontinuity is indicative of a weak merger shock with Mach Number, M ∼ 1.7. The most plausible geometry for the ongoing interaction is a head-on merger occurring between A1569S and a subcluster falling in from the west along the line bisecting the WAT tails.
URI: https://academic.oup.com/mnras/article/509/3/3321/6420250
https://doi.org/10.1093/mnras/stab3188
http://hdl.handle.net/123456789/3965
Appears in Collections:Research Articles

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