2006/11/30 by Jérôme Rodriguez, Jerome Rodriguez, Marion Cadolle Bel +11 · 29 citations
Physics and Astronomy · #Accretion (finance) #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Black hole (networking) #Flux (metallurgy) #Materials science #Neutron star #Nuclear physics #Physics #Pulsars and Gravitational Waves Research #Spectral line #X-ray #X-ray transient #astro-ph
paper · pdf · doi:10.1086/511819
published in The Astrophysical Journal 655(2), L97-L100 (IOP Publishing) · 6 pages, 4 figures accepted for publication in the Astrophysical Journal Letters
arxiv created 2006/12/14 · openalex publication_date 2007/01/11 · arxiv updated 2011/02/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We report the results of a series of RXTE and ATCA observations of the recently discovered X-ray transient IGR J17497-2821. Our 3-200 keV PCA+HEXTE spectral analysis shows very little variations over a period of ~10 days around the maximum of the outburst. IGR J17497-2821 is found in a typical low-hard state (LHS) of X-ray binaries (XRBs), well represented by an absorbed Comptonized spectrum with an iron edge at about 7 keV. The high value of the absorption (~4 × 10 22 cm -2 ) suggests that the source is located at a large distance, either close to the Galactic center or beyond. The timing analysis shows no particular features, while the shape of the power density spectra is also typical of the LHS of XRBs, with ~36% rms variability. No radio counterpart is found down to a limit of 0.21 mJy at 4.80 and 8.64 GHz. Although the position of IGR J17497-2821 in the radio to X-ray flux diagram is well below the correlation usually observed in the LHS of black holes, the comparison of its X-ray properties with those of other sources leads us to suggest that it is a black hole candidate.