V4641 SGR during Outburst: Fast Jets & Variable Core

Details V4641 SGR during Outburst: Fast Jets & Variable Core V4641 SGR during Outburst: Fast Jets & Variable Core

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop.1333r&link_type=abstract

Chandra Proposal ID #03408114

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Chandra Proposal Id #03408114

Scientific paper

The black-hole X-ray binary (BHXB) V4641 Sgr was discovered in 1999; 0.5" radio jets were seen within 24h of the X-ray flare. Another outburst in May has produced ongoing optical/radio/X-ray activity. The apparent jet velocities (9.5c) are the highest yet known; in a few months they may easily extend over an arcmin. With the past 2 months of activity, this is an ideal time to look for such extended emission. The high quiescent luminosity (10x > BHXBs of similar orbital period) and the strong, very wide Fe line seen in 1999 both suggest X-rays from the jets: Doppler boosting may explain the luminosity, & the Fe line suggests entrained/shocked material. We request ToO data to image these putative X-ray jets, and to check for variability both in the jets & in the central source. There is an accepted A04 proposal (Tomsick); but it is important also to observe during the current outburst, given the extreme variability and high proper motions. We'd be happy to share these data with Tomsick.

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