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SS 433: Distance Determination with Radio Images

SS 433: Distance Determination with Radio Images. Jared H. Crossley 14 May 2003. Outline. Introduction: SS 433 and W 50 Research question and thesis The kinematic model of SS 433 Findings Jet deceleration Velocity-distance degeneracy Conclusions Study limitations and future work.

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SS 433: Distance Determination with Radio Images

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  1. SS 433: Distance Determination with Radio Images Jared H. Crossley 14 May 2003

  2. Outline • Introduction: SS 433 and W 50 • Research question and thesis • The kinematic model of SS 433 • Findings • Jet deceleration • Velocity-distance degeneracy • Conclusions • Study limitations and future work SS 433: Distance Determination with Radio Images

  3. Introduction • SS 433 was discovered in late 1970’s, very complex optical emission • Lies at the center of supernova remnant W 50 Dubner, et al. (1998) SS 433: Distance Determination with Radio Images

  4. Intro continued… • One of the brightest X-ray binaries; only one with persistent evolving large scale radio jets • A kinematic model of jet structure was developed and revised over the past 20+ years http://www.astro.soton.ac.uk/~rih/ SS 433: Distance Determination with Radio Images

  5. Research Question • Emission from W 50 places the system at a distance of 3 kiloparsecs(1 parsec = 3.3 light-years) • Fitting models of SS 433 to observed data results in a distance of 5 kpc. Thesis • I show that the model-fitting method may be flawed, by providing evidence of • Jet deceleration, not accounted for • A velocity-distance degeracy SS 433: Distance Determination with Radio Images

  6. Model Parameters • P – precession period • t0 – time where precession phase is zero • v – speed of matter in beams • i – inclination of precession cone axis • θ – half opening angle of cone • D – distance to object • χ – position angle of cone axis • s – handedness of precession • δ – declination SS 433: Distance Determination with Radio Images

  7. 5 Mar 1998 15 GHz VLA 6 Mar 1998 1.5 GHz VLBA D = 4.8, 5, and 5.2 kpc Jet Deceleration 16 Dec 1996 8.5 GHz VLA 13 Jan 1997 8.5 GHz VLA SS 433: Distance Determination with Radio Images

  8. v/c = 0.2647, D = 5 kpc v/c = 0.15 , D = 3 kpc 16 Dec 1996 5 Mar 1998 15 GHz VLA 8.5 GHz VLA 13 Jan 1997 6 Mar 1998 1.5 GHz VLBA 8.5 GHz VLA Velocity-Distance Degeneracy SS 433: Distance Determination with Radio Images

  9. Conclusions • Evidence of jet deceleration with distance from the core • Velocity-distance degeneracy exists in the model • Distances obtained from spatial modeling of jet structure must be re-evaluated SS 433: Distance Determination with Radio Images

  10. Limitations & Future Work • This study was limited by using only four epochs of observations • Further corroboration of the above results should employ a larger number of epochs, distributed evenly in jet phase Thanks to Michael Rupen, Vivek Dhawan, and Amy Mioduszewski (NRAO) for their help with this project. SS 433: Distance Determination with Radio Images

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