Unveiling the nature of three INTEGRAL sources through optical spectroscopy

被引：55

作者：

Masetti, N ^{[1
]}

Palazzi, E ^{[1
]}

Bassani, L ^{[1
]}

Malizia, A ^{[1
]}

Stephen, JB ^{[1
]}

机构：

[1] CNR, Ist Astrofis Spaziale & Fis Cosm, Sez Bologna, I-40129 Bologna, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2004年 / 426卷 / 02期

关键词：

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

D O I：

10.1051/0004-6361:200400078

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：L41 / L44

页数：4

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