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MALT-45: A 7mm survey of the southern Galaxy - II. ATCA follow-up observations of 44GHz class I methanol masers | | Christopher H. Jordan
; Andrew J. Walsh
; Shari L. Breen
; Simon P. Ellingsen
; Maxim A. Voronkov
; Lucas J. Hyland
; | | Date: |
13 Jul 2017 | | Abstract: | We detail interferometric observations of 44GHz class I methanol masers
detected by MALT-45 (a 7mm unbiased auto-correlated spectral-line
Galactic-plane survey) using the Australia Telescope Compact Array. We detect
238 maser spots across 77 maser sites. Using high-resolution positions, we
compare the class I CH$_3$OH masers to other star formation maser species,
including CS (1-0), SiO $v=0$ and the H53$alpha$ radio-recombination line.
Comparison between the cross- and auto-correlated data has allowed us to also
identify quasi-thermal emission in the 44GHz class I methanol maser line. We
find that the majority of class I methanol masers have small spatial and
velocity ranges ($<$0.5pc and $<$5 km s$^{-1}$), and closely trace the systemic
velocities of associated clouds. Using 870$mu$m dust continuum emission from
the ATLASGAL survey, we determine clump masses associated with class I masers,
and find they are generally associated with clumps between 1000 and 3000
$M_odot$. For each class I methanol maser site, we use the presence of OH
masers and radio recombination lines to identify relatively evolved regions of
high-mass star formation; we find that maser sites without these associations
have lower luminosities and preferentially appear toward dark infrared regions. | | Source: | arXiv, 1707.3963 | | Services: | Forum | Review | PDF | Favorites | |
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