The coordinated radio and infrared survey for high-mass star formation – IV. A new radio-selected sample of compact galactic planetary nebulae

Irabor, T., Hoare, M.G., Oudmaijer, R.D., Urquhart, J.S., Kurtz, S., Lumsden, S.L., Purcell, C.R., Zijlstra, A.A., Umana, G. (2018) The coordinated radio and infrared survey for high-mass star formation – IV. A new radio-selected sample of compact galactic planetary nebulae. Monthly Notices of the Royal Astronomical Society, 124 (919). pp. 939-955. ISSN 0035-8711. (doi:10.1093/mnras/sty1929)

Abstract

We present a new radio-selected sample of PNe from the CORNISH survey. This is a radio continuum survey of the inner Galactic plane covering Galactic longitude, 10 < l < 65 and latitude, |b| < 1 with a resolution of 1.5" and sensitivity better than 0.4 mJy/beam. The radio regime, being unbiased by dust extinction, allows for a more complete sample selection, especially towards the Galactic mid-plane. Visual inspection of the CORNISH data, in combination with data from multi-wavelength surveys of the Galactic plane, allowed the CORNISH team to identify 169 candidate PNe. Here, we explore the use of multi-wavelength diagnostic plots and analysis to verify and classify the candidate PNe. We present the multiwavelength properties of this new PNe sample. We find 90 new PNe, of which 12 are newly discovered and 78 are newly classified as PN. A further 47 previously suspected PNe are confirmed as such from the analysis presented here and 24 known PNe are detected. Eight sources are classified as possible PNe or other source types. Our sample includes a young sub-sample, with physical diameters < 0.12 pc, brightness temperatures (> 1000 K) and located closer than 7 kpc. Within this sample is a water-maser PN with a spectral index of - 0.55 ± 0.08, which indicates non-thermal radio emission. Such a radio-selected sample, unaffected by extinction, will be particularly useful to compare with population synthesis models and should contribute to the understanding of the formation and evolution of PNe.

Item Type:	Article
DOI/Identification number:	10.1093/mnras/sty1929
Uncontrolled keywords:	Catalogues; surveys; planetary nebulae; Radio continuum; multi-wavelength
Subjects:	Q Science > QB Astronomy
Divisions:	Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User:	James Urquhart
Date Deposited:	18 Jul 2018 08:37 UTC
Last Modified:	11 Jul 2019 15:28 UTC
Resource URI:	https://kar.kent.ac.uk/id/eprint/67657 (The current URI for this page, for reference purposes)
Urquhart, J.S.:	https://orcid.org/0000-0002-1605-8050