Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...199...61s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 199, no. 1-2, June 1988, p. 61-66.
Astronomy and Astrophysics
Astrophysics
17
Compact Galaxies, Dwarf Galaxies, Radio Emission, Radio Spectra, Supernova Remnants, Thermal Emission, Least Squares Method, Magellanic Clouds
Scientific paper
The Blue Compact Dwarf Galaxies (BCDGs) Mkn 209 (I Zw 36) and II Zw 70 have been observed at 327 MHz using the Westerbork Synthesis Telescope. Mkn 209 remained undetected at a level of 6 mJy/beam area (3σ). II Zw 70 has in addition been observed at 609 MHz and has been detected at both frequencies. It was thus possible for the first time to unambiguously measure the non-thermal radio component of a BCDG. The non-thermal spectral index is steep, αnth = -1.25±0.20 (Sν ≡ να). Thermal emission dominates above about 1 GHz. The steepness of the nonthermal spectrum makes it unlikely that the source of this emission is solely supernova remnants. The derived thermal emission of II Zw 70 implies as much as 1m.4 of visual extinction if compared to the published Hβ flux. The observed ratio of total-to-selective extinction requires extinction and scattering to take place in addition to uniform extinction.
Klein Ulf
Skillman Evan D.
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