Study of the extended radio emission of two supernova remnants and four planetary nebulae associated to MIPSGAL bubbles

TL;DR

This study presents detailed radio observations of supernova remnants and planetary nebulae associated with MIPSGAL bubbles, revealing spectral variations, setting flux limits, and estimating distances and masses.

Contribution

It combines interferometric and single-dish data for high-resolution mapping and provides new insights into the properties of these nebulae and remnants.

Findings

Spectral index variations linked to magnetic field inhomogeneities.

Upper limits set for undetected pulsar flux densities.

Distances and ionized masses estimated for planetary nebulae.

Abstract

We present radio observations of two supernova remnants and four planetary nebulae with the Very Large Array and the Green Bank Telescope. These objects are part of a larger sample of radio sources, discussed in a previous paper, counterpart of the MIPSGAL 24-micron compact bubbles. For the two supernova remnants we combined the interferometric observations with single-dish data to obtain both a high resolution and a good sensitivity to extended structures. We discuss in detail the entire combination procedure adopted and the reliability of the resulting maps. For one supernova remnant we pose a more stringent upper limit for the flux density of its undetected pulsar, and we also show prominent spectral index spatial variations, probably due to inhomogeneities in the magnetic field and in its ejecta or to an interaction between the supernova shock and molecular clouds. We eventually use the 5-GHz maps of the four planetary nebulae to estimate their distance and their ionized mass.