On the hypothesis of an advection-dominated flow in the core of NGC 1052: new constraints from a BeppoSAX observation
Abstract
We report the results of a broadband (0.1-100 keV) X-ray observation of the nearby elliptical galaxy NGC 1052, performed with the BeppoSAX observatory. We confirm the presence of a bright (2-10 keV luminosity Si II 2 m4 x 1042 erg s-1) and strongly absorbed (N_H Si II 2 m 2 x 1023 cm-2) X-ray source. The flatness of the X-ray spectrum (photon index, Gamma , Si II 2 meq1.4), the estimated low accretion rate (dot m equiv dot M/dot M_Edd Si II 2 m 10-4) and the radio-to-X-ray spectral energy distribution suggest that this observation may represent the first direct measurement above 10 keV of an accretion-dominated flow in an elliptical galaxy.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- December 2000
- DOI:
- 10.48550/arXiv.astro-ph/0011338
- arXiv:
- arXiv:astro-ph/0011338
- Bibcode:
- 2000A&A...364L..80G
- Keywords:
-
- ACCRETION;
- ACCRETION DISKS;
- STARS: BINARIES: CLOSE;
- STARS: NOVAE;
- CATACLYSMIC VARIABLES;
- STARS: INDIVIDUAL:;
- STARS: MASS-LOSS;
- STARS: SUPERNOVAE: GENERAL;
- Astrophysics
- E-Print:
- 5 Latex pages, 4 figures, Accepted for publication in Astronomy &