Multi-scale study of massive star forming region NGC 6334I/F

Abstract

This thesis reports an observational multi-scale study of the high-mass star-forming region NGC6334I=F on scales ranging from 10 000 AU down to 1 AU. In 2015, NGC6334I-MM1B started a period of high accretion analogous to FU Orionis bursts in low-mass stars. This thesis aimed to examine the effects of the burst on the water and methanol masers in the region. Archival 2016.9 5 cm continuum with the Jansky Very Large Array (JVLA) and archival 2015.6 1.3 mm continuum with the Atacama Large Millimetre/Submillimetre Array (ALMA) were used in combination with seven epochs of 22 GHz Very Long Baseline Interferometry (VLBI) observations of water masers with VLBI Exploration for Radio Astrometry (VERA) between 2014 and 2016 and 2019.6 JVLA observations of 6.7 GHz methanol masers in NGC6334I. Water masers were detected in CM2-W2, MM1-W1, UCHII-W1, UCHII-W2 and UCHII-W3. The variability of water masers in CM2-W2 and MM1-W1 showed systematic trends indicating that the variability is associated with the recent accretion burst. ...