A multifrequency radio continuum survey of M33. II - Thermal and non-thermal emission

Astronomy and Astrophysics – Astrophysics

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Continuous Radiation, Extragalactic Radio Sources, Nonthermal Radiation, Radio Emission, Spiral Galaxies, Thermal Emission, Radiant Flux Density, Shock Fronts, Supernova Remnants, Synchrotron Radiation

Scientific paper

The galactic radio continuum emission of M33 at 17.4 cm, 11.1 cm, 6.3 cm, and 2.8 cm wavelength is investigated after subtraction of background sources. The integrated spectrum of the Effelsberg measurements between 35.6 cm and 6.3 cm is steeper (α = 0.91±0.13, S ∝ ν-α) than for most other spiral galaxies. The radio emission is separated into non-thermal and thermal components. The latter contributes 29±16% and 48±29% to the total intensity at 6.3 cm and 2.8 cm respectively. The synchrotron emission appears to be more smoothly distributed than the thermal emission and reveals global similarities with the distribution of the known supernova remnant (SNR) candidates.

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