Astrophys. J., 880, 70-70 (2019/August-1)
Expanding the sample of radio minihalos in galaxy clusters.
GIACINTUCCI S., MARKEVITCH M., CASSANO R., VENTURI T., CLARKE T.E., KALE R. and CUCITI V.
Abstract (from CDS):
Radio minihalos are diffuse synchrotron sources of unknown origin found in the cool cores of some galaxy clusters. We use GMRT and VLA data to expand the sample of minihalos by reporting three new minihalo detections (A2667, A907, and PSZ1 G139.61+24.20) and confirming minihalos in five clusters (MACS J0159.8-0849, MACS J0329.6-0211, RXC J2129.6+0005, AS 780, and A3444). With these new detections and confirmations, the sample now stands at 23, the largest sample to date. For consistency, we also reanalyze archival VLA 1.4 GHz observations of seven known minihalos. We revisit possible correlations between the nonthermal emission and the thermal properties of their cluster hosts. Consistent with our earlier findings from a smaller sample, we find no strong relation between the minihalo radio luminosity and the total cluster mass. Instead, we find a strong positive correlation between the minihalo radio power and X-ray bolometric luminosity of the cool core (r < 70 kpc). This supplements our earlier result that most, if not all, cool cores in massive clusters contain a minihalo. Comparison of radio and Chandra X-ray images indicates that the minihalo emission is typically confined by concentric sloshing cold fronts in the cores of most of our clusters, supporting the hypothesis that minihalos arise from electron reacceleration by turbulence caused by core gas sloshing. Taken together, our findings suggest that the origin of minihalos should be closely related to the properties of thermal plasma in cluster cool cores.
© 2019. The American Astronomical Society. All rights reserved.
catalogs - galaxies: clusters: general - radio continuum: galaxies - surveys - X-rays: galaxies: clusters
Table 3: the radio sources SN are not in SIMBAD exept for MACS J0159.8-0849 S1 and MACS J0329.6-0211 S1. Table 9: Radio sources SNN are not in SIMBAD.
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