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First simultaneous multi-wavelength observations of the black hole candidate IGR J17091-3624 ATCA, INTEGRAL, Swift, and RXTE views of the 2011 outburst

Identifieur interne : 006A93 ( Main/Exploration ); précédent : 006A92; suivant : 006A94

First simultaneous multi-wavelength observations of the black hole candidate IGR J17091-3624 ATCA, INTEGRAL, Swift, and RXTE views of the 2011 outburst

Auteurs : J. Rodriguez [France] ; S. Corbel [France] ; I. Caballero [France] ; J. A. Tomsick [États-Unis] ; T. Tzioumis [Australie] ; A. Paizis [Italie] ; M. Cadolle Bel [Espagne] ; E. Kuulkers [Espagne]

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RBID : Pascal:12-0012688

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Abstract

We present the results of the first four (quasi-)simultaneous radio (ATCA), X-ray (Swift, RXTE), and γ-ray (INTEGRAL) observations of the black hole candidate IGR J17091-3624, performed in February and March 2011. The X-ray analysis shows that the source was in the hard state, and then it transited to a soft intermediate state. We study the correlated radio/X-ray behaviour of this source for the first time. The radio counterpart to IGR J17091-3624 was detected during all four observations with the ATCA. In the hard state, the radio spectrum is typical of optically thick synchrotron emission from a self-absorbed compact jet. In the soft intermediate state, the detection of optically thin synchrotron emission is probably due to a discrete ejection event associated with the state transition. The position of IGR J17091-3624 in the radio versus X-ray luminosity diagram (aka fundamental plane) is compatible with that of the other black hole sources for distances greater than 11 kpc. IGR J17091-3624 also appears as a new member of the few sources that show a strong quenching of radio emission after the state transition. Using the estimated luminosity at the spectral transition from the hard state, and for a typical mass of 10 M◦., we estimate a distance to the source between ˜11 and ˜17 kpc, compatible with the radio behaviour of the source.


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Le document en format XML

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<div type="abstract" xml:lang="en">We present the results of the first four (quasi-)simultaneous radio (ATCA), X-ray (Swift, RXTE), and γ-ray (INTEGRAL) observations of the black hole candidate IGR J17091-3624, performed in February and March 2011. The X-ray analysis shows that the source was in the hard state, and then it transited to a soft intermediate state. We study the correlated radio/X-ray behaviour of this source for the first time. The radio counterpart to IGR J17091-3624 was detected during all four observations with the ATCA. In the hard state, the radio spectrum is typical of optically thick synchrotron emission from a self-absorbed compact jet. In the soft intermediate state, the detection of optically thin synchrotron emission is probably due to a discrete ejection event associated with the state transition. The position of IGR J17091-3624 in the radio versus X-ray luminosity diagram (aka fundamental plane) is compatible with that of the other black hole sources for distances greater than 11 kpc. IGR J17091-3624 also appears as a new member of the few sources that show a strong quenching of radio emission after the state transition. Using the estimated luminosity at the spectral transition from the hard state, and for a typical mass of 10 M◦., we estimate a distance to the source between ˜11 and ˜17 kpc, compatible with the radio behaviour of the source.</div>
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