Journal
ASTRONOMY & ASTROPHYSICS
Volume 426, Issue 2, Pages L41-L44Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:200400078
Keywords
X-rays : binaries; X-rays : galaxies; techniques : spectroscopic; X-rays : individuals : IGR J17303-0601; IGR J18027-1455, IGR J21247+5058
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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-a 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 nonnegligible importance of smaller telescopes in modern astrophysics.
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