Unveiling the Nature of the High Energy Source IGR J19140+0951
arXiv:astro-ph/0412555 · doi:10.1051/0004-6361:20041854
Abstract
We report on high energy observations of IGR J19140+0951 performed with RXTE on three occasions in 2002, 2003 and 2004, and INTEGRAL during a very well sampled and unprecedented high energy coverage of this source from early-March to mid-May 2003. Our analysis shows that IGR J19140+0951 spends most of its time in a very low luminosity state, probably corresponding to the state observed with RXTE, and characterised by thermal Comptonisation. In some occasions we observe variations of the luminosity by a factor of about 10 during which the spectrum can show evidence for a thermal component, besides thermal Comptonisation by a hotter plasma than during the low luminosity state. The spectral parameters obtained from the spectral fits to the INTEGRAL and RXTE data strongly suggest that IGR J19140+0951 hosts a neutron star rather than a black hole. Very importantly, we observe variations of the absorption column density (with a value as high as ~10^23 cm^-2). Our spectral analysis also reveals a bright iron line detected with both RXTE/PCA and INTEGRAL/JEM-X, at different levels of luminosity. We discuss these results and the behaviour of IGR J19140+0951, and show, by comparison with other well known systems (Vela X-1, GX 301-2, 4U 2206+54), that IGR J19140+0951 is most probably a High Mass X-ray Binary.
Accepted for publication in Astronomy and Astrophysics. 13 pages, 6 figures
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- A description of sources detected by INTEGRAL during the first 4 years of observations
- INTEGRAL/IBIS 7-year All-Sky Hard X-Ray Survey. Part II: Catalog of Sources
- Characterizing a new class of variability in GRS 1915+105 with simultaneous INTEGRAL/RXTE observations
- Unveiling the nature of six HMXBs through IR spectroscopy
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- Two years of INTEGRAL monitoring of GRS 1915+105 Part 1: multiwavelength coverage with INTEGRAL, RXTE, and the Ryle radio Telescope
- INTEGRAL and XMM-Newton observations of the X-ray pulsar IGR J16320-4751/AX J1631.9-4752
- Peering through the stellar wind of IGR J19140+0951 with simultaneous INTEGRAL/RXTE observations
- Gamma-rays from the vicinity of accreting neutron stars inside compact high-mass X-ray binaries
- Discovery of very-high-energy gamma-ray emission from the vicinity of PSR J1913+1011 with H.E.S.S
- The nature of the infrared counterpart of IGR J19140+0951
- GMRT observations of the field of INTEGRAL X-ray sources- I
- XMM-Newton discovery of mHz quasi-periodic oscillations in the high mass X-ray binary IGRJ19140+0951
- Swift, INTEGRAL, RXTE, and Spitzer reveal IGR J16283-4838
- Probing the nature of IGR J16493-4348: Spectral and temporal analysis of the 1-100 keV emission
- Optical identification of IGR J19140+0951
- Unveiling the nature of IGR J16283-4838