Unveiling the nature of INTEGRAL objects through optical spectroscopy. II. The nature of four unidentified sources

A. Bazzano; A.J. Bird; A.J. Dean; A. Malizia; E. Maiorano; E. Mason; E. Palazzi; J.B. Stephen; L. Bassani; N. Masetti

Unveiling the nature of INTEGRAL objects through optical spectroscopy. II. The nature of four unidentified sources

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arxiv astro-ph/0511182 v1 pith:X7OAP4TC submitted 2005-11-07 astro-ph

Unveiling the nature of INTEGRAL objects through optical spectroscopy. II. The nature of four unidentified sources

N. Masetti , E. Mason , L. Bassani , A.J. Bird , E. Maiorano , A. Malizia , E. Palazzi , J.B. Stephen

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A. Bazzano A.J. Dean P. Ubertini R. Walter

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We present the results of our optical spectrophotometric campaign ongoing at the Astronomical Observatory of Bologna in Loiano (Italy) on hard X-ray sources detected by INTEGRAL. We observed spectroscopically the putative optical counterparts of four more INTEGRAL sources, IGR J12391-1610, IGR J18406-0539, 2E 1853.7+1534 and IGR J19473+4452. These data have allowed us to determine their nature, finding that IGR J12391-1610 (=LEDA 170194) and IGR J19473+4452 are Seyfert 2 galaxies at redshifts z = 0.036 and z = 0.053, respectively, IGR J18406-0539 (=SS 406) is a Be massive X-ray binary located at about 1.1 kpc from Earth, and 2E 1853.7+1534 is a Type 1 Seyfert galaxy with z = 0.084. Physical parameters for these objects are also evaluated by collecting and discussing the available multiwavelength information. The determination of the extragalactic nature of a substantial fraction of sources inside the INTEGRAL surveys underlines the importance of hard X-ray observations for the study of background Active Galactic Nuclei located beyond the `Zone of Avoidance' of the Galactic Plane.

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