Volume 459, Number 1, November III 2006
|Page(s)||21 - 30|
|Published online||12 September 2006|
Unveiling the nature of INTEGRAL objects through optical spectroscopy
V. Identification and properties of 21 southern hard X-ray sources
INAF – Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna, Via Gobetti 101, 40129 Bologna, Italy (formerly IASF/CNR, Bologna) e-mail: email@example.com
2 Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
3 INAF – Istituto di Astrofisica Spaziale e Fisica Cosmica di Roma, Via Fosso del Cavaliere 100, 00133 Rome, Italy (formerly IASF/CNR, Rome)
4 School of Physics & Astronomy, University of Southampton, Southampton, Hampshire, SO17 1BJ, UK
5 INAF – Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone, Italy
6 INTEGRAL Science Data Centre, Chemin d'Ecogia 16, 1290 Versoix, Switzerland
Accepted: 2 August 2006
Optical spectroscopic identification of the nature of 21 unidentified southern hard X-ray objects is reported here in the framework of our campaign aimed at determining the nature of newly-discovered and/or unidentified sources detected by INTEGRAL. Our results show that 5 of these objects are magnetic Cataclysmic Variables (CVs), 4 are High-Mass X-ray Binaries (HMXBs; one of which is in the Large Magellanic Cloud) and 12 are Active Galactic Nuclei (AGNs). When feasible, the main physical parameters for these hard X-ray sources are also computed using the multiwavelength information available in the literature. These identifications further underscore the importance of INTEGRAL in the study of the hard X-ray spectrum of AGNs, HMXBs and CVs, and the usefulness of a strategy of catalogues cross-correlation plus optical spectroscopy to securely pinpoint the actual nature of the X-ray sources detected with INTEGRAL.
Key words: galaxies: Seyfert / stars: novae, cataclysmic variables / X-rays: binaries / techniques: spectroscopic / X-rays: general
© ESO, 2006
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