Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-18
Astron.Astrophys. 398 (2003) 441-446
Astronomy and Astrophysics
Astrophysics
7 pages, 3 figures; Astronomy & Astrophysics, in press
Scientific paper
10.1051/0004-6361:20021639
We present a long BeppoSAX observation of Abell 754 that reports a nonthermal excess with respect to the thermal emission at energies greater than ~45 keV. A VLA radio observation at 1.4 GHz definitely confirms the existence of diffuse radio emission in the central region of the cluster, previously suggested by images at 74 and 330 MHz (Kassim et al 2001), and reports additional features. Besides, our observation determines a steeper radio halo spectrum in the 330-1400 MHz frequency range with respect to the spectrum detected at lower frequencies, indicating the presence of a spectral cutoff. The presence of a radio halo in A754, considered the prototype of a merging cluster, reinforces the link between formation of Mpc-scale radio regions and very recent or current merger processes. The radio results combined with the hard X-ray excess detected by BeppoSAX give information on the origin of the electron population responsible for nonthermal phenomena in galaxy clusters. We discuss also the possibility that 26W20, a tailed radio galaxy with BL Lac characteristics located in the field of view of the PDS, could be responsible for the observed nonthermal hard X-ray emission.
Bacchi M.
de Grandi Sabrina
Feretti Luigina
Fusco-Femiano Roberto
Giovannini Gabriele
No associations
LandOfFree
Hard X-ray and radio observations of Abell 754 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Hard X-ray and radio observations of Abell 754, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hard X-ray and radio observations of Abell 754 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-575287