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Astron. Astrophys. 364, L80-L84 (2000)

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Letter to the Editor

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

M. Guainazzi 1, T. Oosterbroek 2, L.A. Antonelli 3 and G. Matt 4

1 XMM-Newton SOC, VILSPA, ESA, Apartado 50727, 28080 Madrid, Spain
2 Astrophysics Division, Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
3 Osservatorio Astronomico di Roma, Via dell'Osservatorio, 00044 Monteporzio Catone, Italy
4 Università degli Studi Roma Tre, Dipartimento di Fisica, Via della Vasca Navale 84, 00046 Roma, Italy

Received 14 September 2000 / Accepted 17 November 2000


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 [FORMULA][FORMULA] erg s-1) and strongly absorbed ([FORMULA] cm-2) X-ray source. The flatness of the X-ray spectrum (photon index, [FORMULA], [FORMULA]1.4), the estimated low accretion rate ([FORMULA]) 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.

Key words: accretion, accretion disks – galaxies: active – galaxies: elliptical and lenticular, cD – galaxies: individual: NGC 1052 – galaxies: nuclei – X-rays: galaxies

Send offprint requests to: M.Guainazzi

© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001