Mon. Not. R. Astron. Soc., 484, 4113-4126 (2019/April-2)
Merging cold front and AGN feedback in the peculiar galaxy cluster Abell 2626.
KADAM S.K., SONKAMBLE S.S., PAWAR P.K. and PATIL M.K.
Abstract (from CDS):
This paper presents the analysis of combined 134 ks Chandra data of a peculiar galaxy cluster Abell 2626. This study confirms the earlier detection of the east cavity at ∼13 kpc and reports the detection of a new cavity at ∼39 kpc to the west of the X-ray peak. The average mechanical power injected by the active galactic nucleus outburst P_ cav_ ∼6.6 ×1044 erg s–1 is ∼29 times more than required to compensate the cooling luminosity Lcool = 2.30 ±0.02 ×1043 erg s–1 . The edges in the surface brightness (SB) to the west and south-west at ∼36 kpc and 33 kpc, respectively, have gas compressions of 1.57 ± 0.08 and 2.06 ± 0.44 and are spatially associated with arcs in the temperature and metallicity maps due to the merging cold fronts. A systematic study of the nuclear sources exhibited dramatic changes over the span of 10 years. The NE source that emitted mostly in the soft band in the past had disappeared in recent observations. Instead, an excess emission was seen at 2.2 arcsec to its west that required an unrealistic line-of-sight velocity of ∼ 675 x c if it 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 to a hard state due to the change in the mass accretion rate. No such spectral change was noticed for the NE source.