BeppoSAX observation of Hercules A and MRC 0625-536

Citation
E. Trussoni et al., BeppoSAX observation of Hercules A and MRC 0625-536, ASTRON ASTR, 366(3), 2001, pp. 788-795
Citations number
34
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
00046361 → ACNP
Volume
366
Issue
3
Year of publication
2001
Pages
788 - 795
Database
ISI
SICI code
0004-6361(200102)366:3<788:BOOHAA>2.0.ZU;2-M
Abstract
We present BeppoSAX observations of the two FR I type radio galaxies Hercul es A (3C 348) and MRC 0625-536 in the energy range 0.2-200 keV. Data analys is shows that the X-ray flux from Hercules A is consistent with a diffuse t hermal plasma emitting at T approximate to 4-5 keV with a possible, but som ewhat uncertain, contribution of a softer component at T approximate to 3 k eV. The non thermal emission from the active nucleus must be significantly smaller than the thermal one, and no indication of relevant core obscuratio n by a surrounding torus was detected. The flux from MRC 0625-536 originate s from an extended region and has been fitted to a thermal la iu with T app roximate to 5.7 keV and with a column density consistent with the galactic absorption. A spatially resolved spectral analysis does not show a relevant variation of the temperature and of the metallicity across the diffuse emi ssion zone. A non thermal spectral component, related to the nuclear activi ty, may be present in the innermost region with some possible amount of loc al obscuration, contributing less than or similar to 10% to the total lumin osity. Hard X-ray emission from MRC 0625-536 has been detected in the PDS ( 15-200 keV) that may be related either to its galactic core or to the intra cluster region.