INTEGRAL long-term monitoring results on persistently bright NS LMXBs

Astronomy and Astrophysics – Astronomy

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X-Ray Binary Stars, Neutron Stars, Accretion Disks, Spectroscopy, X-Ray Sources, X-Ray Bursts, Neutron Stars, Infall, Accretion, And Accretion Disks, Spectroscopy And Spectrophotometry

Scientific paper

We present long-term spectral and timing results from an INTEGRAL monitoring program of persistently bright neutron star Low-Mass X-ray Binaries, i.e. the three bright Atoll sources GX 3+1, GX 9+1 and GX 9+9, and the Z sources GX 5-1, GX 17+2, GX 340+0 and GX 349+2. From the available observing periods between 2003 and 2009, each lasting ~2 months, we have selected a few sample periods for each source, and analyzed all JEM-X and IBIS/ISGRI data with offsets <4 degrees. We seek an explanation for the dichotomy between the hard X-ray tails or lack thereof in the (otherwise very similar) X-ray spectra of Z sources and bright Atolls, respectively.

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