G70.7+1.2: A nonthermal bubble in a globule - Nova, supernova remnant, or outflow?

Astronomy and Astrophysics – Astronomy

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Extragalactic Radio Sources, Infrared Sources (Astronomy), Millimeter Waves, Molecular Clouds, Supernova Remnants, Near Infrared Radiation, Particle Acceleration, Radio Astronomy, Relativistic Particles, Stellar Winds

Scientific paper

Millimeter-wave, near-IR, and 21 cm observations of the radio source G70.7 + 1.2 , which has been proposed to be a recent SNR developing inside a molecular cloud, are presented. A small molecular cloud with properties similar to a large dark cloud or globule is interacting with the nonthermal radio continuum source. The molecular cloud has a lumpy structure with its highest column density portion lying just outside the brightest portion of the radio continuum shell. If the radio source was produced by a supernova explosion, its kinetic energy was several orders of magnitude less than that of most observed supernovae. An OB star wind with certain characteristics is sufficient to drive the bubble, but the high radio continuum nonthermal surface brightness and polarization of the object is not explained by this model.

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