The Southern Ultra-Compact HII Region Population

Simango, Yara Herminia

Publication date

February 2023

Abstract

In this research the first high spatial resolution radio continuum survey of the southern galactic plane to date provided by the CORNISH-South survey is used to study a key stage of massive star forming regions. The CORNISH-South survey has the largest and well selected sample of UCHII regions of the southern Galactic plane. Taken with the Australia Telescope Compact Array (ATCA) at 5.5 GHz with 2.5 arcsec of resolution and 9 GHz with 1.5 arcsec of resolution in the region 295◦ <l<350◦ and|b|≤1◦. Observations with higher resolution of the 72 UCHII regions that were not sufficiently resolved by 5.5 GHz or 9 GHz survey were carried out with the ATCA 6 km array to provide resolutions of 0.75 and 0.55 arcsec. The majority of the sources became...