Astronomy and Astrophysics, volume 432, 235-247 (2005/3-2)
Unveiling the nature of the high energy source IGR J19140+0951.
RODRIGUEZ J., CABANAC C., HANNIKAINEN D.C., BECKMANN V., SHAW S.E. and SCHULTZ J.
Abstract (from CDS):
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 ∼1023cm–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.
X-rays: binaries - X-rays: individual: IGR J19140+0951 - accretion, accretion disks - gamma-rays: observations
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