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On the relationship of UC Hii regions and class II methanol masers. I. source catalogs

Hu, B., Menten, K. M., Wu, Y., Bartkiewicz, A., Rygl, K., Reid, M. J., Urquhart, J.S., Zheng, X. (2016) On the relationship of UC Hii regions and class II methanol masers. I. source catalogs. The Astrophysical Journal, 833 (1). Article Number 18. ISSN 1538-4357. (doi:10.3847/0004-637X/833/1/18) (KAR id:60708)

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We conducted Very Large Array C-configuration observations to measure positions and luminosities of Galactic Class II 6.7 GHz methanol masers and their associated ultra-compact H ii regions. The spectral resolution was 3.90625 kHz and the continuum sensitivity reached 45 ?Jy beam?1. We mapped 372 methanol masers with peak flux densities of more than 2 Jy selected from the literature. Absolute positions have nominal uncertainties of 0farcs3. In this first paper on the data analysis, we present three catalogs; the first gives information on the strongest feature of 367 methanol maser sources, and the second provides information on all detected maser spots. The third catalog presents derived data of the 127 radio continuum counterparts associated with maser sources. Our detection rate of radio continuum counterparts toward methanol masers is approximately one-third. Our catalogs list properties including distance, flux density, luminosity, and the distribution in the Galactic plane. We found no significant relationship between luminosities of masers and their associated radio continuum counterparts, however, the detection rate of radio continuum emission toward maser sources increases statistically with the maser luminosities.

Item Type: Article
DOI/Identification number: 10.3847/0004-637X/833/1/18
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: James Urquhart
Date Deposited: 03 Mar 2017 16:51 UTC
Last Modified: 09 Dec 2022 00:39 UTC
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