The FR-I Radio Galaxies NGC 315 and NGC 4261 Observed with ASCA

Details The FR-I Radio Galaxies NGC 315 and NGC 4261 Observed with ASCA The FR-I Radio Galaxies NGC 315 and NGC 4261 Observed with ASCA

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..475m&link_type=abstract

Publications of the Astronomical Society of Japan, vol.53, no. 3, p. 475-481

Astronomy and Astrophysics

Astronomy

10

Galaxies: Active, Galaxies: Individual (Ngc 315, Ngc 4261), X-Rays: Individual (Ngc 315, Ngc 4261)

Scientific paper

FR-I radio galaxies NGC 315 and NGC 4261 were observed in X-rays with ASCA for ~37 ks and ~54 ks, respectively. Hard X-ray emission from a point-like source at the nucleus was detected at a 2-10 keV luminosity of 3.1 × 1041 and 9.2 × 1040 erg s-1, respectively, for assumed distances of 66 Mpc and 29 Mpc (for H0=75 km s-1 Mpc-1). The 2-10 keV spectra of NGC 315 and NGC 4261 were both fitted successfully with a power-law of photon index 2.02 +/- 0.34 and 1.45 +/- 0.11, respectively, plus emission from hot gas. The NGC 315 nucleus is mildly absorbed. No X-ray variability was detected from either object, with typical upper limits of several tens per cent. These results imply the presence of a low-luminosity active galactic nucleus in both galaxies, and reconfirm the previous recognition that the FR-I nuclei are significantly less X-ray luminous than the FR-II ones.

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