XMM-Newton observations of four high mass X-ray binaries and IGR J17348−2045

• Published in: Astronomy and astrophysics (Berlin) 2012-08, Vol.544, p.A118
• Main Authors: Bozzo, E., Pavan, L., Ferrigno, C., Falanga, M., Campana, S., Paltani, S., Stella, L., Walter, R.
• Format: Article
• Language: English
• Subjects: Astronomy; Earth, ocean, space; Exact sciences and technology; gamma rays: stars; stars: emission-line; X-rays: binaries
• ISSN: 0004-6361; 1432-0746
• DOI: 10.1051/0004-6361/201218900

We present the results of the XMM-Newton observations of five hard X-ray emitters: IGR J08262−3736, IGR J17354−3255, IGR J16328−4726, SAX J1818.6−1703, and IGR J17348−2045. The first source is a confirmed supergiant high mass X-ray binary, the following two are candidates supergiant fast X-ray transients, SAX J1818.6−1703 is a confirmed supergiant fast X-ray transient and IGR J17348−2045 is one of the still unidentified objects discovered with INTEGRAL. The XMM-Newton observations permitted the first detailed soft X-ray spectral and timing study of IGR J08262−3736 and provided further support in favor of the association of IGR J17354−3255 and IGR J16328−4726 with the supergiant fast X-ray transients. SAX J1818.6−1703 was not detected by XMM-Newton, thus supporting the idea that this source reaches its lowest X-ray luminosity ( ≃ 1032 erg s-1) around apastron. For IGR J17348−2045 we identified for the first time the soft X-ray counterpart and proposed the association with a close-by radio object, suggestive of an extragalactic origin.