Volume 433, Number 2, April II 2005
|Page(s)||L41 - L44|
|Published online||22 March 2005|
Letter to the Editor
Discovery of X-ray pulsations from IGR J16320–4751 = AX J1631.9–4752
Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117810 Moscow, Russia e-mail: firstname.lastname@example.org
2 Max-Planck-Institute für Astrophysik, Karl-Schwarzschild-Str. 1, 85740 Garching bei München, Germany
3 CEA Saclay, DSM/DAPNIA/SAp (CNRS FRE 2591), 91191 Gif-sur-Yvette Cedex, France
4 Integral Science Data Center, Chemin d'Ecogia 16, 1290 Versoix, Switzerland
Accepted: 23 February 2005
We report a discovery of strong modulations of the X-ray flux detected from IGR J16320-4751 = AX J1631.9-4752 with a period of s. We reanalyzed the data of an XMM-Newton ToO performed soon after the discovery of the source by INTEGRAL and found the modulation at a period of ± 40 s with a high significance. Modulations of the source flux with two possible periods of ~1300 and ~1500 s were identified in the ASCA archival data. It is very likely that the modulation can be interpreted as X-ray pulsations, favouring a pulsar as the compact object in IGR/AX J16320-4752. Thus for the moment this source became the fourth source from a new class of highly absorbed binary systems for which the pulsations are observed.
Key words: individual: IGR J16320-4751 = AX J1631.9-4752 / binaries: general / X-rays: binaries
© ESO, 2005
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