Unveiling the nature of three INTEGRAL sources through optical spectroscopy

Free access article

Issue		A&A Volume 426, Number 2, November I 2004


Page(s)		L41 - L44
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:200400078

A&A 426, L41-L44 (2004)
DOI: 10.1051/0004-6361:200400078

Letter

Unveiling the nature of three INTEGRAL sources through optical spectroscopy

N. Masetti, E. Palazzi, L. Bassani, A. Malizia and J. B. Stephen

Istituto di Astrofisica Spaziale e Fisica Cosmica - Sezione di Bologna, CNR, via Gobetti 101, 40129 Bologna, Italy
e-mail: masetti@bo.iasf.cnr.it

(Received 10 August 2004 / Accepted 10 September 2004 )

Abstract
The results of an optical spectroscopy campaign performed at the Astronomical Observatory of Bologna in Loiano (Italy) on three hard X-ray sources detected by INTEGRAL (IGR J17303-0601, IGR J18027-1455 and IGR J21247+5058) are presented. These data have allowed a determination of the nature for two of them, with IGR J17303-0601 being a low mass X-ray binary in the Galaxy and IGR J18027-1455 a background type 1 Seyfert galaxy at redshift z = 0.035. IGR J21247+5058, instead, has a quite puzzling spectroscopic appearance, with a broad, redshifted H $_\alpha$ complex superimposed onto a "normal" F/G-type Galactic star continuum: these features, together with the spatially coincident extended radio emission, might suggest a chance alignment between a relatively nearby star and a background radio galaxy. These results underline the still non-negligible importance of smaller telescopes in modern astrophysics.

Key words: X-rays: binaries -- X-rays: galaxies -- techniques: spectroscopic -- X-rays: individuals: IGR J17303-0601, IGR J18027-1455, IGR J21247+5058

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