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Title:
GBT Observations of Radio Recombination Line Emission Associated with Supernova Remnants W28 and W44
Authors:
Hewitt, John W.; Yusef-Zadeh, F.
Affiliation:
AA(Northwestern Univ.), AB(Northwestern Univ.)
Publication:
American Astronomical Society Meeting 208, #47.05; Bulletin of the American Astronomical Society, Vol. 38, p.122
Publication Date:
06/2006
Origin:
AAS
Bibliographic Code:
2006AAS...208.4705H

Abstract

Since the 1970's weak radio recombination line(RRL) emission has been observed toward several supernova remnants. It has remained unclear if this emission is in fact associated with these remnants or due to intervening sources such as extended HII envelopes along the line of sight. To explore the origin of this emitting gas we have recently undertaken Green Bank Telescope (GBT) observations of prominent supernova remnants W28 and W44 which are well-known to be interacting with molecular clouds. Eight alpha and beta RRL transitions were mapped at C-Band (4-6 GHz) with 2.5' resolution. Maps cover 0.5 and 0.25 square degrees of W28 and W44, respectively, permitting comparison with the distribution of X-rays, Radio, and H-alpha emission. Both remnants are observed to have a mixed-morphology: a radio-continuum shell centrally-filled by thermal X-rays. We find the observed velocity of RRL emission is near the systemic velocity of both remnants as traced by OH(1720 MHz) masers. Preliminary results are presented exploring the association of the RRL-emitting gas with these interacting supernova remants and implications for the origins of the hot thermal X-ray plasma that fills their centers. Support for this work was provided by the NSF through The GBT Student Support Program from the NRAO.
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