2004/11/22 by L. Sidoli, S. Vercellone, S. Mereghetti +1 · 2 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.1051/0004-6361:200400114
published as Astron.Astrophys. 429 (2005) L47 · 4 pages, 4 figures; accepted for publication in Astronomy & Astrophysics Letters
arxiv created 2004/11/22 · openalex publication_date 2005/01/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
The INTEGRAL satellite, during its regular scanning observations of the Galactic plane, has discovered several new X-ray sources emitting above 20 keV. The nature of the great majority of them is still unknown. Here we report on the likely low energy counterpart, observed with ASCA in 1994 and 1997, of one of these sources, IGR J16195–4945. The ASCA source is faint ( erg cm-2 s-1), highly absorbed ( cm-2) and has a rather hard spectrum (photon index ~ 0.6). These spectral properties are suggestive of a neutron star in a High Mass X-ray Binary. Our analysis of all the public INTEGRAL data of IGR J16195–4945 shows that this source is variable and was in a high state with a 20–40 keV flux of ~17 mCrab in two occasions in March 2003.