English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We detail interferometric observations of 44GHz class I methanol masersdetected by MALT-45 (a 7mm unbiased auto-correlated spectral-lineGalactic-plane survey) using the Australia Telescope Compact Array. We detect238 maser spots across 77 maser sites. Using high-resolution positions, wecompare 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 alsoidentify quasi-thermal emission in the 44GHz class I methanol maser line. Wefind that the majority of class I methanol masers have small spatial andvelocity ranges ($<$0.5pc and $<$5 km s$^{-1}$), and closely trace the systemicvelocities of associated clouds. Using 870$\mu$m dust continuum emission fromthe ATLASGAL survey, we determine clump masses associated with class I masers,and find they are generally associated with clumps between 1000 and 3000$M_\odot$. For each class I methanol maser site, we use the presence of OHmasers and radio recombination lines to identify relatively evolved regions ofhigh-mass star formation; we find that maser sites without these associationshave lower luminosities and preferentially appear toward dark infrared regions.

MALT-45: A 7mm survey of the southern Galaxy - II. ATCA follow-up observations of 44GHz class I methanol masers