ATCA survey of water masers in the Large Magellanic Cloud
H. Imai (1,2), Y. Katayama (1), S.P. Ellingsen (3), and Y. Hagiwara, (4) ((1) Kagoshima University, (2) ICRAR, The University of Western, Australia, (3) University of Tasmania, (4) NAOJ)
TL;DR
This study used archival ATCA data to identify 9 new water masers in the Large Magellanic Cloud, increasing the known total to 23, which can aid in understanding the galaxy's rotation and motion.
Contribution
It reports the discovery of nine new water masers in the LMC, expanding the catalog and enabling future precise astrometric measurements.
Findings
Total water masers in LMC increased to 23.
Detected masers show significant variability over decades.
Potential for improved galactic rotation models using maser data.
Abstract
We have analysed archival data taken with the Australia Telescope Compact Array (ATCA) during 2001--2003 and detected nine new interstellar and circumstellar water masers in the LMC. This takes the total number of star formation water masers in the LMC to 23, spread over 14 different star forming regions and three evolved stars. Three water maser sources (N105a/MC23, N113/MC24, N157a/MC74) have been detected in all the previous observations that targeted these sites, although all show significant variability on timescales of decades. The total number of independent water maser sources now known in the LMC means that through very long baseline interferometry astrometric measurements it will be possible to construct a more precise model of the galactic rotation of the LMC and its orbital motion around the Milky Way Galaxy.
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