Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6670t&link_type=abstract
HST Proposal ID #6670
Computer Science
Hst Proposal Id #6670 Binaries + Star Forma
Scientific paper
Superluminal transients sources {STSs} are newly discovered galactic sources showing strong X-ray outbursts associated with sporadic relativistic ejection of radio emitting plasmoids in a double-jet geometry. Qualitatively, the jet geometry of emission from STSs resembles that of AGNs and SS 433, suggesting similar conditions of accretion onto their respective compact objects {most likely black holes}. HST observations of STSs aimed at detecting optical emission from plasmoids would be very valuable in testing models of relativistic emission and interaction with circumstellar environments. Typically, detectable radio emission from ejected plasmoids lasts for several weeks and large plasmoids can be ejected within a timescale of a few days. A target of opportunity {TOO} HST observation of STS is therefore possible, following a timely warning of STS activity. The success of a TOO observation strongly relies on simultaneous multiwavelength observations involving X-ray, radio and optical monitoring, and our group is engaged in the current monitoring and study of STSs. We propose to carry out TOO HST observations of nearby STSs {gro and possibly } or of accessible new STSs if both of the following conditions are satisfied: {1} a major hard X-ray outburst is detected {typically with a flux larger than several hundred mCrab}; {2} continuum radio emission in the 0.8-20 GHz band is detected during the X-ray outburst with a clear indication of plasmoid propagation.
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