Discovery of X-ray pulsations from IGR J16320–4751 = AX J1631.9–4752

Free access article

Issue		A&A Volume 433, Number 2, April II 2005


Page(s)		L41 - L44
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:200500092

A&A 433, L41-L44 (2005)
DOI: 10.1051/0004-6361:200500092

Letter

Discovery of X-ray pulsations from IGR J16320-4751 = AX J1631.9-4752

A. Lutovinov^{1, 2}, J. Rodriguez^{3, 4}, M. Revnivtsev^{2, 1} and P. Shtykovskiy^{1, 2}

¹ Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117810 Moscow, Russia
e-mail: lutovinov@hea.iki.rssi.ru
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

(Received 19 November 2004 / Accepted 23 February 2005 )

Abstract
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 $P\sim1300$ 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 P=1309 $\pm$ 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

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