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Discovery of the INTEGRAL X/Gamma-ray transient IGR J00291+5934: a Comptonised accreting ms pulsar ?

S. E. Shaw·N. Mowlavi·J. Rodriguez·P. Ubertini·F. Capitanio·K. Ebisawa·D. Eckert·T. J. -L. Courvoisier·N. Produit·R. Walter·M. Falanga
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Abstract

We report the discovery of a high-energy transient with the IBIS/ISGRI detector on board the INTEGRAL observatory. The source, namely IGR J00291+5934, was first detected on 2nd December 2004 in the routine monitoring of the IBIS/ISGRI 20--60 keV images. The observations were conducted during Galactic Plane Scans, which are a key part of the INTEGRAL Core Programme observations. After verifying the basic source behaviour, the discovery was announced on 3rd December. The transient shows a hard Comptonised spectrum, with peak energy release at about 20 keV and a total luminosity of ~ 0.9E36 erg/s in the 5--100 keV range, assuming a distance of 3 kpc. Following the INTEGRAL announcement of the discovery of IGR J00291+5934, a number of observations were made by other instruments. We summarise the results of those observations and, together with the INTEGRAL data, identifiy IGR J00291+5934 as the 6th member of a class of accreting X-ray millisecond pulsars.

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S. E. Shaw, N. Mowlavi, J. Rodriguez, P. Ubertini, F. Capitanio, K. Ebisawa, D. Eckert, T. J. -L. Courvoisier, N. Produit, R. Walter, M. Falanga. 2005-01-24. Discovery of the INTEGRAL X/Gamma-ray transient IGR J00291+5934: a Comptonised accreting ms pulsar ?. https://doi.org/10.1051/0004-6361%3A200500011

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