Outbursts from IGR J17473-2721

S. Zhang; Y.-P. Chen; J.-M. WangD. F. TorresT.-P. Li

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Outbursts from IGR J17473-2721

机译：Outbursts from IGR J17473-2721

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Aims. IGR J17473-2721 was discovered by INTEGRAL as a neutron star low mass X-ray binary. To date, two outbursts have beendetected in X-rays by RXTE/ASM and SWIFT: the one occurring in 2005 was weak and was characterized by a low/hard statespectrum; the one of March 2008 was strong and showed a 6-step evolution in its flux. We investigate their evolution, emphasizingthe later outburst.Methods. We analyzed all available observations carried out by RXTE on IGR J17473-2721 during its later outburst. We analyzed aswell all the available SWIFT/BAT data on this source.Results. The flux of the latter outburst rose in ～one month and then kept roughly constant for the following ～two months. During thistime period, the source was in a low/hard state. The source moved to a high/soft state within the following three days, accompaniedby the occurrence of an additional outburst at soft X-rays and the end of the preceding outburst in hard X-rays. During the decay ofthis soft outburst, the source went back to a low/hard state within 6 days, with a luminosity 4 times lower than the first transition.This shows a full cycle of the hysteresis in transition between the hard and the soft states. The fact that the flux remained roughlyconstant for ～two months at times prior to the spectral transition to a high/soft state might be regarded as the result of balancing theevaporation of the inner disk and the inward accretion flow, in a model in which the state transition is determined by the mass flowrate. Such a balance might be broken via an additional mass flow accreting onto the inner disk, which lightens the extra soft outburstand causes the state transition. However, the possibility of an origin of the emission from the jet during this time period cannot beexcluded. The spectral analysis suggests an inclined XRB system for IGR J17473-2721. Such a long-lived preceding low/hard statemakes IGR J17473-2721 resemble the behavior of outbursts seen in black hole X-ray binaries like GX 339-4.

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来源
《Astronomy and astrophysics》 |2009年第1期|231-237|共7页
作者
S. Zhang; Y.-P. Chen; J.-M. WangD. F. TorresT.-P. Li;
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作者单位

Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Beijing 100049, PR China;

ICREA & Institut de Ciencies de l'Espai (IEEC-CSIC), Campus UAB, Facultat de Ciencies, Torre C5-parell, 2a planta,08193 Barcelona, Spain;

Center for Astrophysics,Tsinghua University, Beijing 100084, PR China;

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正文语种英语
中图分类天文学;
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X-rays; individuals; IGR J17473-2721;

Outbursts from IGR J17473-2721

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