Investigation of X-ray cavities in the cooling flow system Abell 1991

Abstract

We present results based on the systematic analysis of \textit{Chandra} archive data on the X-ray bright Abell Richness class-I type cluster Abell 1991 with an objective to investigate properties of the X-ray cavities hosted by this system. The unsharp masked image as well as 2-d $\beta$ model subtracted residual image of Abell 1991 reveals a pair of X-ray cavities and a region of excess emission in the central $\sim$12 kpc region. Both the cavities are of ellipsoidal shape and exhibit an order of magnitude deficiency in the X-ray surface brightness compared to that in the undisturbed regions. Spectral analysis of X-ray photons extracted from the cavities lead to the temperature values equal to $1.77_{-0.12}^{+0.19}$ keV for N-cavity and $1.53_{-0.06}^{+0.05}$ keV for S-cavity, while that for the excess X-ray emission region is found to be equal to $2.06_{-0.07}^{+0.12}$ keV. Radial temperature profile derived for Abell 1991 reveals a positive temperature gradient, reaching to a maximum of 2.63 keV at $\sim$ 76 kpc and then declines in outward direction. 0.5$-$2.0 keV soft band image of the central 15\arcsec region of Abell 1991 reveals relatively cooler three different knot like features that are about 10\arcsec off the X-ray peak of the cluster. Total power of the cavities is found to be equal to $\sim 8.64\times 10^{43}$ \lum, while the X-ray luminosity within the cooling radius is found to be 6.04 $\times 10^{43}$ \lum, comparison of which imply that the mechanical energy released by the central AGN outburst is sufficient to balance the radiative loss.

29 pages, 12 figures and 3 tables, accepted for publication in Astrophysics and Space Science

References in corpus (6)

• Heating Hot Atmospheres with Active Galactic Nuclei
• Intracluster Medium Entropy Profiles for a Chandra Archival Sample of Galaxy Clusters
• Feedback Heating by Cosmic Rays in Clusters of Galaxies
• An XMM-Newton study of the environments, particle content and impact of low-power radio galaxies
• The duty cycle of radio-mode feedback in complete samples of clusters
• Warming rays in cluster cool cores

Cited by in corpus (16)

• Feedback from Active Galactic Nuclei in Galaxy Groups
• The Origin of Molecular Clouds In Central Galaxies
• A volume-limited sample of X-ray galaxy groups and clusters: III. Central abundance drops
• X-ray cavities and temperature jumps in the environment of the strong cool core cluster Abell 2390
• Detection of a pair of prominent X-ray cavities in Abell 3847
• Cavities, shocks and a cold front around 3C 320
• AGN Feedback in Groups and Clusters of Galaxies
• AGN Feedback in galaxy groups: a detailed study of X-ray features and diffuse radio emission in IC1262
• Merging cold front and AGN feedback in the peculiar galaxy cluster Abell 2626
• AGN driven perturbations in the intra-cluster medium of cool core cluster ZwCl 2701
• A detailed study of X-ray cavities in the intracluster environment of the cool core cluster Abell 3017
• MACS J0553.4-3342: A young merging galaxy cluster caught through the eyes of Chandra and HST
• Sloshing and spiral structures breeding a putative radio mini-halo in the environment of a cool-core cluster Abell 795
• Sloshing Cold Fronts in Galaxy Cluster Abell 2566
• Investigating AGN feedback in H$\alpha$-luminous galaxy clusters: first Chandra X-ray analysis of Abell 2009
• Evidence of sloshing-driven mini-halo formation in the cool-core cluster RXCJ1558.3-1410