Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-04-22
Astronomy and Astrophysics
Astrophysics
11 pages, 3 figures, 2 tables, accepted for publication on A&A, main journal. The quality of Fig. 1 was degraded to fit the ar
Scientific paper
10.1051/0004-6361:20065111
We present further results from our ongoing optical spectrophotometric campaign at the Astronomical Observatory of Bologna in Loiano (Italy) on unidentified hard X-ray sources detected by INTEGRAL. We observed spectroscopically the putative optical counterparts of the INTEGRAL sources IGR J00234+6141, IGR J01583+6713, IGR J06074+2205, IGR J13091+1137 and IGR J20286+2544. We find that the first two are Galactic objects, namely a Cataclysmic Variable at a distance of about 300 pc and a Be/X transient High-Mass X-ray Binary (HMXB) located at about 6.4 kpc, respectively, whereas the last one is identified with MCG +04-48-002, a Starburst/HII galaxy at redshift z = 0.013 hiding a Seyfert 2 nucleus. We identify IGR J13091+1137 as the (likely Seyfert 2 type) active nucleus of galaxy NGC 4992, which we classify as an X-ray Bright, Optically Normal Galaxy; this is the first example of this type of object to be detected by INTEGRAL, and one of the closest of this class. We moreover confirm the possible Be/X nature of IGR J06074+2205, and we estimate it to be at a distance of about 1 kpc. We also reexamine the spectrum of the z = 0.087 elliptical radio galaxy PKS 0352-686, the possible counterpart of the INTEGRAL source IGR J03532-6829, and we find that it is a BL Lac. Physical parameters for these sources are also evaluated by discussing our findings in the context of the available multiwavelength information. These identifications further stress the importance of INTEGRAL in the study of the hard X-ray spectrum of Active Galactic Nuclei, HMXBs and Cataclysmic Variables.
Bassani Loredana
Bazzano Angela
Bird Andrew J.
Dean Anthony J.
Malizia Angela
No associations
LandOfFree
Unveiling the nature of INTEGRAL objects through optical spectroscopy. IV. A study of six new hard X-ray sources does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Unveiling the nature of INTEGRAL objects through optical spectroscopy. IV. A study of six new hard X-ray sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unveiling the nature of INTEGRAL objects through optical spectroscopy. IV. A study of six new hard X-ray sources will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-33773