SS433 Jet Diagnostics using Chandra X-ray Spectroscopy

Details SS433 Jet Diagnostics using Chandra X-ray Spectroscopy SS433 Jet Diagnostics using Chandra X-ray Spectroscopy

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0902m&link_type=abstract

American Astronomical Society, HEAD meeting #9, #9.02; Bulletin of the American Astronomical Society, Vol. 38, p.362

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The unusual X-ray binary SS 433 has been observed with the Chandra X-ray observatory on four occasions at different orbital and precessional phases. These data have provided excellent views of the hottest parts of the oppositely directed jets. Emission line widths directly provide the opening angle of the jet. Most importantly, we can also determine the composition, density, temperature, and ionization state of the jet gas from the X-ray spectra of the twin jets so that better models of the physical conditions in the jets can be constructed. In some observations, the soft X-ray emission lines are nearly absent, leading to a possible interpretation that jet cooling is predominantly radiative during these times.
We report results from spectral fitting of data obtained in August, 2005 with the Chandra High Energy Transmission Grating Spectrometer (HETGS). While line strengths and continuum levels hardly change, the jet Doppler shifts show aperiodic variations that may result from interactions with the local environment. The X-ray and optical emission line regions are found to be related but not coincident as the optical line emission persists for days while the X-ray emission lines fade in less than 5000 s. The X-ray spectrum of the blue-shifted jet shows over two dozen emission lines from plasma at a variety of temperatures. The emission measure distribution derived from the spectrum can be used to test jet cooling models.

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