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Title:
Rossi X-Ray Timing Explorer Observations of the Eastern Lobe of W50 Associated with SS 433
Authors:
Safi-Harb, Samar; Petre, Robert
Publication:
The Astrophysical Journal, Volume 512, Issue 2, pp. 784-792. (ApJ Homepage)
Publication Date:
02/1999
Origin:
APJ
ApJ Keywords:
ISM: INDIVIDUAL (W50), STARS: INDIVIDUAL (SS 433), ISM: SUPERNOVA REMNANTS, X-RAYS: STARS
DOI:
10.1086/306803
Bibliographic Code:
1999ApJ...512..784S

Abstract

We present the Rossi X-Ray Timing Explorer (RXTE) observations of the SNR W50, associated with SS 433. The observations cover the X-ray lobe found between SS 433 and the outer eastern radio ``ear'' of W50. The X-ray spectrum measured with the proportional counter array and the High-Energy Timing Experiment in the 3-100 keV range favors nonthermal over thermal models for this part of W50. We combine the RXTE spectrum with the ROSAT and ASCA spectra, thus covering ~3 orders of magnitude in energy. The spectrum of the harder X-ray emission is well represented by a power law with a photon index of ~1.45 and a total X-ray luminosity of ~1.5x10^35 ergs s^-1 for a source distance of 5.5 kpc. We thus confirm the nonthermal nature of the inner X-ray lobe. We discuss its implications in the context of the interaction between the jets from SS 433 and the surroundings.
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