High Resolution Spectroscopy of the Possible Jets in GRS 1758-258

Details High Resolution Spectroscopy of the Possible Jets in GRS 1758-258 High Resolution Spectroscopy of the Possible Jets in GRS 1758-258

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..725h&link_type=abstract

Chandra Proposal ID #02408042

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Chandra Proposal Id #02408042

Scientific paper

As of 28 Feb, the microquasar GRS1758-258 has entered an extremely dim x-ray state (RXTE- IAUC submitted). This is unlikely to happen again for 10 years. Two HRC observations in 2000 Sept/Oct revealed a variable point source plus elongated (~1") emission. In one month, the morphology changed showing the likely formation of an ~arcsecond x-ray jet. At the likely source distance (8.5kpc), relativistic bulk motion would be required. The current state is ~3x dimmer in RXTE than typical. We suspect the point source has turned off, and the residual flux is from ejected material. Cui et al. (ACIS/HETG, astro-ph/0009380) found extended emission around another microquasar, 1E1740.7-2942, and may have detected spectral lines, but they could not separate the core and extended components. We will measure the spectrum of the extended (jet?) emission without point source contamination. This has the possibility of discovering red and blue-shifted emission lines a la SS433.

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