ﻻ يوجد ملخص باللغة العربية
This paper presents the analysis of a combined 134 ks {it Chandra} data of a peculiar galaxy cluster Abell 2626. This study confirms the earlier detection of the east cavity at $sim$13 kpc and reports detection of a new cavity at $sim$39 kpc on the west of the X-ray peak. The average mechanical power injected by the AGN outburst ${rm P_{cav} sim 6.6 times 10^{44}, erg, s^{-1}}$ is $sim$29 times more than required to compensate the cooling luminosity ${rm L_{cool} = 2.30 pm 0.02 times 10^{43} {rm~erg s}^{-1}}$. The edges in the SB on the west and south-west at $sim$36 kpc and 33 kpc, respectively, have the gas compressions of 1.57$pm$0.08 and 2.06$pm$0.44 and are spatially associated with the arcs in the temperature and metallicity maps due to the merging cold fronts. The systematic study of the nuclear sources exhibited dramatic changes over the span of ten years. The NE source that emitted mostly in the soft band in the past disappeared in the recent observations. Instead, an excess emission was seen at $2.2$ on its west and required an unrealistic line of sight velocity of $sim$ $675times{}c$ if is due to its movement. The count rate analysis and spectral analysis exhibited a change in the state of the SW source from a soft state to the hard due to the change in the mass accretion rate. No such spectral change was noticed for the NE source.
We present LOFAR data from 110--180~MHz of the merging galaxy cluster Abell 1682, alongside archival optical, radio and X-ray data. Our 6 arc-second resolution images at low frequencies reveal new structures associated with numerous radio galaxies in
In this paper we analyze the peculiar radio structure observed across the central region of the galaxy cluster Abell 585 (z=0.12). In the low-resolution radio maps, this structure appears uniform and diffuse on angular scales of ~3 arcmin, and is see
We examine the possible acceleration mechanisms of the relativistic particles responsible for the extended radio emission in Abell 520. We used new LOFAR 145 MHz, archival GMRT 323 MHz and VLA 1.5 GHz data to study the morphological and spectral prop
The pre-merging system of galaxy clusters Abell 3391-Abell 3395 located at a mean redshift of 0.053 has been observed at 1 GHz in an ASKAP/EMU Early Science observation as well as in X-rays with eROSITA. The projected separation of the X-ray peaks of
A number of radio observations have revealed the presence of large synchrotron-emitting sources associated with the intra-cluster medium. There is strong observational evidence that the emitting particles have been (re-)accelerated by shocks and turb