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Boumis, P,Meaburn, J,Alikakos, J,Redman, MP,Akras, S,Mavromatakis, F,Lopez, JA,Caulet, A,Goudis, CD
Monthly Notices Of The Royal Astronomical Society
Deep optical observations of the interaction of the SS 433 microquasar jet with the W50 radio continuum shell
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ISM : general ISM : individual : G39.7-2.0 (W50) ISM : kinematics and dynamics supernova remnants ECHELLE SPECTROMETER 433 SYSTEM KINEMATICS REMNANT ROSAT SS433
Four mosaics of deep, continuum-subtracted, CCD images have been obtained over the extensive Galactic radio continuum shell, W50, which surrounds the remarkable stellar system SS 433. Two of these mosaics in the H alpha+[N II] and [O III] 5007 angstrom emission lines, respectively, cover a field of similar to 2 degrees.3 x 2 degrees.5 which contains all of W50 but at a low angular resolution of 5 arcsec. The third and fourth mosaics cover the eastern (in [O III] 5007 angstrom) and western ( in H alpha + [N II] 6548, 6584 angstrom) filamentary nebulosity, respectively, but at an angular resolution of 1 arcsec. These observations are supplemented by new low-dispersion spectra and long-slit, spatially resolved echelle spectra. The [O III] 5007 angstrom images show for the first time the distribution of this emission in both the eastern and western filaments while new Ha + [ N II] emission features are also found in both of these regions. Approaching flows of faintly emitting material from the bright eastern filaments of up 100 km s(-1) in radial velocity are detected. The present observations also suggest that the heliocentric systemic radial velocity of the whole system is 56 +/- 2 km s(-1). Furthermore, very deep imagery and high-resolution spectroscopy of a small part of the northern radio ridge of W50 has revealed for the first time the very faint optical nebulosity associated with this edge. It is suggested that patchy foreground dust along the approximate to 5 kpc sightline is inhibiting the detection of all of the optical nebulosity associated with W50. The interaction of the microquasar jets of SS 433 with the W50 shell is discussed.
DOI 10.1111/j.1365-2966.2007.12276.x
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