Thermal and nonthermal radio emission from the Small Magellanic Cloud

Details Thermal and nonthermal radio emission from the Small Magellanic Cloud Thermal and nonthermal radio emission from the Small Magellanic Cloud

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...178...62l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 178, no. 1-2, May 1987, p. 62-76.

Astronomy and Astrophysics

Astrophysics

33

Galactic Radio Waves, Magellanic Clouds, Nonthermal Radiation, Radio Emission, Thermal Radiation, Astronomical Maps, Continuous Spectra, Far Infrared Radiation, H Ii Regions, Hydrogen Atoms, Hydrogen Ions, Irregular Galaxies, Polarization (Waves)

Scientific paper

The radio continuum emission of the Small Magellanic Cloud (SMC) is investigated. Individual (unresolved) sources extracted from the Parkes 1.4 GHz survey (Haynes et al., 1986) are discussed. Most of the sources within the SMC body coincide with bright H II regions and possess flat radio continuum spectra. A study of the spectral index distribution is made using maps at 408 MHz, 1.4 GHz and 2.3 GHz. The expected coincidence of flat-spectrum regions with sites of recent star formation is found. The magnetic field in the SMC is discussed using the measurements of linear polarization in the Parkes survey. A very close resemblance between the distributions of radio continuum and far-infrared (FIR) emission is established. The radio map of the SMC, extrapolated to 10.7 GHz, is found to be governed by the thermal emission of the brightest H II regions. The low ratio of radio-to-optical luminosity of the SMC derived here is consistent with the low supernova rates reported earlier.

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