http://arxiv.org/abs/2102.04650
We present a detailed analysis of a cool-core galaxy cluster Abell~3017, at a redshift of $z!=! 0.219$, which has been identified to be merging with its companion cluster Abell~3016. This study has made use of X-ray ({\it Chandra}), UV (GALEX), optical (ESO/VLT), mid-infrared (WISE), and radio uGMRT observations of this cluster. Using various image processing techniques, such as unsharp masking, 2-d fits using Beta models, contour binning and the use of surface brightness profiles, we show the existence of a pair of X-ray cavities, at a projected distance of ~$\sim$20\arcsec (70\,kpc) and ~$\sim$16\arcsec (57\,kpc), respectively from the core of Abell~3017. We also detect an excess of X-ray emission, relatively hotter than that of the surroundings, towards the south, at $\sim$25\arcsec (88\, kpc) from the core of the cluster, indicating the existence of an in-falling galaxy group. We find that the radio lobes are responsible for the observed X-ray cavities detected in this system. The lower values of mid-IR WISE color [W1-W2] and [W2-W3] imply that the central BCG of Abell~3017 is a star-forming galaxy. The current star formation rate of the central BCG, estimated from the ${\rm H\alpha}$ and {\it GALEX} FUV luminosities, are equal to be $\sim 5.06\pm 0.78$ \Msun yr$^{-1}$ and $\sim 9.20\pm 0.81$ \Msun yr$^{-1}$, respectively. We detect, for the first time, a radio phoenix $\sim$150\,kpc away from the radio core, with a spectral index of ($\alpha !\leq! -1.8$). We also report the detection of $\rm~Pa_\alpha$ emission in this cluster using ESO VLT {\tt SINFONI} imaging data.
M. Pandge, B. Sebastian, R. Seth, et. al.
Wed, 10 Feb 21
31/64
Comments: 13 pages, 13 figures, 7 Tables
You must be logged in to post a comment.