Other
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410..922k&link_type=abstract
The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 922-926 (1997).
Other
4
Jets, Outflows, And Bipolar Flows, X-Ray Sources, X-Ray Bursts, X-Ray, Black Holes
Scientific paper
Recent studies with ASCA have shown very complicated, strange iron K features in the spectra of galactic jet systems. SS 433, the ``classic'' jet, was found to have pairs of Doppler-shifted lines, contrary to the previous belief that the receding X-ray jet is short and hidden behind the accretion disk. The transient jets, GRS 1915+105 and GRO J1655-40, show spectral dips, which have never been observed in any other source and are interpreted as absorption lines or Doppler-shifted absorption edges. If they are resonant absorption lines of helium-like iron, they would be the evidence of highly ionized, anisotropically distributed plasma near the jet engine. These features peculiar to galactic jet systems are expected to be explained in terms of the nature of the sources and the jet-formation mechanisms. Since ASCA was proved to be an excellent tool for diagnostics of jets, observation campaigns of the jet systems were planned and performed. SS 433 was observed about thirty times in the three years of the campaign, covering the phase space of the 162.5-day precession and the 13-day orbital motion. The extracted physics of the system, such as X-ray-jet length ten times longer than previous estimations, jet kinetic luminosity exceeding 1040 erg s-1, etc., draw a highly energetic and stormy, new picture of SS 433. The transient jets, GRS 1915+105 and GRO J1655-40, were also observed several times. GRS 1915+105 was found to be active in ASCA band even months after onsets of outburst. Violent variations were not seen. GRO J1655-40 was observed to be transit between high and low states, and the low state is consistent to occultation of a component. We review ASCA Observations of galactic jet systems and present some topics from recent progresses.
Brinkmann Wolfgang
Dotani Tadayasu
Ebisawa Ken
Foster Richard
Harmon Alan
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