W28 - A possible association of supernova remnants and H II regions

Details W28 - A possible association of supernova remnants and H II regions W28 - A possible association of supernova remnants and H II regions

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..40...91g&link_type=abstract

Astrophysics and Space Science, vol. 40, Mar. 1976, p. 91-110. Research supported by the Science Research Council.

Astronomy and Astrophysics

Astronomy

30

H Ii Regions, Radio Spectra, Spectrum Analysis, Supernova Remnants, Astronomical Maps, Hydrogen Ions, Radio Astronomy, Tables (Data)

Scientific paper

The nature of various components of the W28 complex region is investigated. The radio spectra of W28-A1 (G 6.4-0.2), M20 (G 7.0-0.2), W28-A2 (G 5.9-0.4), W28-A4 (G 5.3-1.1), KE59 (G 6.6-0.3) and G 6.4-0.5 are established over a wide range of frequencies. The W28-A1 (G 6.4-0.2) source is a SNR (sp. index -0.41), the M20, W28-A2 and KE59 seem to be thermal sources (sp. indexes -0.06, -0.15 and -0.04 respectively) whereas the W28-A4 and G 6.4-0.5 are possibly mixed sources containing thermal and non-thermal features. Certain physical parameters of the thermal components are derived by adopting a model. The physical properties of the W28-A1 SNR are investigated. The possibility of a SNR-H ii regions~association in the W28 region is also discussed

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