Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011yera.confe..19h&link_type=abstract
The 41st Young European Radio Astronomers Conference, held at University of Manchester/Jodrell Bank Observatory, 18-20 July 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We have undertaken a multi wavelength study of the G305 star forming complex. This intense region of massive star formation is estimated to be forming > 30 O7 stars (Clark & Porter 2004). Numerous studies of small regions have been carried out, until recently studies of the entire complex have been hampered by the large degree scale. Recent improvements in instrumentation have allowed us to map the entire region in unprecedented detail in an attempt to unravel the star formation mechanisms and history. Here we present results of two sets of observations using the MOPRA radio telescope and the Australia Telescope Compact Array (ATCA) interferometer, to study the molecular and ionised environment of G305.
G305 is a giant HII complex at a distance of ~4 kpc and extending over 1.5 x 1 degrees it is one of the closest, largest and most intense regions of massive star formation in the galaxy. With multiple HII regions, IR hotspots, maser emission, and YSOs located around the periphery of the central HII region. These factors makes it an excellent laboratory in which to study massive star formation, and so we have undertaken a multi wavelength observational campaign designed to study the star formation across the G305 complex.
Here I will discuss the results of recent Mopra telescope 12 mm and ATCA 3 & 6 cm radio observations. Mopra 12 mm observations have uncovered several large ammonia (1,1), (2,2) and (3,3) clumps and numerous H2O masers within the region. We comment on the general properties of the molecular material and the relation to a variety of star formation tracers.
ATCA 3 & 6 cm observations were carried out using the newly commissioned CABB. The large degree scale size of G305 required us to perform one of the largest mosaics with the new CABB system to date. I will discuss the distribution and properties of the compact and diffuse emission, compare these observations to the molecular material and star formations tracers. I will present an almost complete census of UC HII regions in G305, measure the propagation of massive star formation into the surrounding molecular clouds, determine the properties of stellar sources with the central clusters and determine their energy input.
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