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X-ray states and radio emission in the black hole candidate XTE J1550-564 | | S. Corbel
; P. Kaaret
; R.K. Jain
; C.D. Bailyn
; R.P. Fender
; J.A. Tomsick
; E. Kalemci
; V. McIntyre
; D. Campbell-Wilson
; J.M. Miller
; M.L. McCollough
; | | Date: |
7 Feb 2001 | | Subject: | astro-ph | | Affiliation: | CEA Saclay), P. Kaaret (Harvard-CfA), R.K. Jain, C.D. Bailyn (Yale University), R.P. Fender (U. Amsterdam), J.A. Tomsick, E. Kalemci (UCSD), V. McIntyre (ATNF), D. Campbell-Wilson (University of Sydney), J.M. Miller (MIT) and M.L. McCollough (USRA | | Abstract: | We report on radio and X-ray observations of the black hole candidate (BHC) XTE J1550-564 performed during its 2000 X-ray outburst. Observations have been conducted with the Australia Telescope Compact Array (ATCA) and have allowed us to sample the radio behavior of XTE J1550-564 in the X-ray Low Hard and Intermediate/Very High states. We observed optically thin radio emission from XTE J1550-564 five days after a transition to an Intermediate/Very High state, but we observed no radio emission six days later, while XTE J1550-564 was still in the Intermediate/Very High state. In the Low Hard state, XTE J1550-564 is detected with an inverted radio spectrum. The radio emission in the Low Hard state most likely originates from a compact jet; optical observations suggest that the synchrotron emission from this jet may extend up to the optical range. The total power of the compact jet might therefore be a significant fraction of the total luminosity of the system. We suggest that the optically thin synchrotron radio emission detected five days after the transition to the Intermediate/Very High state is due to a discrete ejection of relativistic plasma during the state transition. Subsequent to the decay of the optically thin radio emission associated with the state transition, it seems that in the Intermediate/Very High state the radio emission is quenched by a factor greater than 50, implying a suppression of the outflow. We discuss the properties of radio emission in the X-ray states of BHCs. | | Source: | arXiv, astro-ph/0102114 | | Services: | Forum | Review | PDF | Favorites | |
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