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Unveiling the nature of three INTEGRAL sources through optical spectroscopy | | N. Masetti
; E. Palazzi
; L. Bassani
; A. Malizia
; J.B. Stephen
; | | Date: |
10 Sep 2004 | | Subject: | astro-ph | | Affiliation: | IASF, Sezione di Bologna, Italy | | 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. | | Source: | arXiv, astro-ph/0409250 | | Services: | Forum | Review | PDF | Favorites | |
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