Deep Chandra observations of Abell 2495: a possible sloshing-regulated feedback cycle in a triple-offset galaxy cluster
The Astrophysical Journal(2023)
摘要
We present the analysis of new, deep $Chandra$ observations (130~ks) of the
galaxy cluster Abell~2495. This object is known for the presence of a triple
offset between the peaks of the intracluster medium (ICM), the brightest
cluster galaxy (BCG), and the warm gas glowing in H$\alpha$ line. The new
$Chandra$ data confirm that the X-ray emission peak is located at a distance of
$\sim$6.2 kpc from the BCG, and at $\sim$3.9 kpc from the H$\alpha$ emission
peak. Moreover, we identify two generations of X-ray cavities in the ICM,
likely inflated by the central radio galaxy activity. Through a detailed
morphological and spectral analysis we determine that the power of the AGN
outbursts ($P_{cav} = 4.7\pm1.3\times10^{43}$~erg~s$^{-1}$) is enough to
counterbalance the radiative losses from ICM cooling ($L_{cool} =
5.7\pm0.1\times10^{43}$~erg~s$^{-1}$). This indicates that, despite a
fragmented cooling core, Abell~2495 still harbors an effective feedback cycle.
We argue that the offsets are most likely caused by sloshing of the ICM,
supported by the presence of spiral structures and a probable cold front in the
gas at $\sim$58 kpc east of the center. Ultimately, we find that the outburst
interval between the two generations of X-ray cavities is of the order of the
dynamical sloshing timescale, as already hinted from the previous $Chandra$
snapshot. We thus speculate that sloshing may be able to regulate the
timescales of AGN feedback in Abell~2495, by periodically fuelling the central
AGN.
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关键词
Galaxy clusters,Abell clusters,Active galactic nuclei,Cooling flows,Intracluster medium
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