ASCA X-Ray Observation of the Lobe Dominant Radio Galaxy NGC 612
Abstract
The ASCA results from the radio galaxy NGC 612 are presented. Recently, Kaneda et al. (1995) and Feigelson et al. (1995) reported their independent discovery of inverse-Comptonized X-rays from radio lobes of Fornax A with ASCA and ROSAT, respectively. The detection realized the long-proposed method to sort out electron energy density and magnetic field intensity from the ratio of the synchrotron radio flux to the IC X-ray flux (e.g. Harris and Grindlay 1985). We conducted the ASCA observation of the lobe dominant radio galaxy NGC 612 ( z = 0.030 ) in 1996 to investigate physical state in lobes with the new method. The 843 MHz interferometry image of the source shows bright lobes of ~5' in diameter. Obtained X-ray data reveal heavily absorbed low luminosity core emission with extended hard X-rays emission associated with the lobes. The extended source emits 1 -- 5 times 10-8 Jy at 1 keV, which is rather close to the expected value assuming equipartition state. We discuss derived physical state in the lobes and core activity, in comparison with the two previous observations of Fornax A and Centaurus B (Tashiro et al. 1996) radio lobes.
- Publication:
-
The Hot Universe
- Pub Date:
- 1998
- Bibcode:
- 1998IAUS..188..289T