On the hypothesis of an advection-dominated flow in the core of NGC 1052: new constraints from a BeppoSAX observation

Citation
M. Guainazzi et al., On the hypothesis of an advection-dominated flow in the core of NGC 1052: new constraints from a BeppoSAX observation, ASTRON ASTR, 364(2), 2000, pp. L80-L84
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
0004-6361 → ACNP
Volume
364
Issue
2
Year of publication
2000
Pages
L80 - L84
Database
ISI
SICI code
0004-6361(200012)364:2<L80:OTHOAA>2.0.ZU;2-C
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 similar to4 x 10 (42) erg s(-1)) and strongly absorbed (N-H similar to 2 x 10(23) cm(-2)) X- ray source. The flatness of the X-ray spectrum (photon index, Gamma, simila r or equal to1.4), the estimated low accretion rate ((m) over dot equivalen t to (M) over dot/(M) over dot(Edd) similar to 10(-4)) and the radio-to-X-r ay spectral energy distribution suggest that this observation may represent the first direct measurement above 10 keV of an accretion-dominated flow i n an elliptical galaxy.