Missing hard states and regular outbursts: the puzzling case of the black hole candidate 4U 1630-472

15 May 2015 Capitanio F. Campana R. De Cesare G. Ferrigno C.

4U 1630-472 is a recurrent X-ray transient classified as a black-hole candidate from its spectral and timing properties. One of the peculiarities of this source is the presence of regular outbursts with a recurrence period between 600 and 730 d that has been observed since the discovery of the source in 1969... (read more)

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  • HIGH ENERGY ASTROPHYSICAL PHENOMENA