Identification of 8 INTEGRAL hard X-ray sources with Chandra

Free access article

Issue		A&A Volume 444, Number 2, December III 2005


Page(s)		L37 - L40
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:200500205

A&A 444, L37-L40 (2005)
DOI: 10.1051/0004-6361:200500205

Letter

Identification of 8 INTEGRAL hard X-ray sources with Chandra

S. Sazonov^{1, 2}, E. Churazov^{1, 2}, M. Revnivtsev^{1, 2}, A. Vikhlinin^{3, 2} and R. Sunyaev^{1, 2}

¹ Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85740 Garching bei München, Germany
e-mail: sazonov@mpa-garching.mpg.de
² Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117997 Moscow, Russia
³ Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA

(Received 29 August 2005 / Accepted 22 October 2005)

Abstract
We report the results of identification of 8 hard X-ray sources discovered by the INTEGRAL observatory during the ongoing all-sky survey. These sources have been observed by Chandra. In 6 cases a bright X-ray source was found within the INTEGRAL localization region, which permitted to unambiguously identify 5 of the objects with nearby galaxies, implying that they have an active galactic nucleus (AGN), whereas one source is likely an X-ray binary in LMC. 4 of the 5 newly discovered AGNs have measured redshifts in the range 0.025-0.055. The X-ray spectra reveal the presence of significant amounts of absorbing gas ( N_H in the range 10²²-10²⁴ cm^-2) in all 5 AGNs, demonstrating that INTEGRAL is starting to fill in the sample of nearby obscured AGNs.

Key words: surveys -- galaxies: Seyfert -- X-rays: general

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