W28-A possible association of supernova remnants and Hii regions |
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| Authors: | C Goudis |
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| Institution: | (1) Dept. of Astronomy, Univ. of Manchester, England |
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| Abstract: | 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-Hii regions association in the W28 region is also discussed. |
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