Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21642208f&link_type=abstract
American Astronomical Society, AAS Meeting #216, #422.08; Bulletin of the American Astronomical Society, Vol. 41, p.835
Astronomy and Astrophysics
Astrophysics
Scientific paper
Microwave Amplification by Stimulated Emission of Radiation (MASER) originates from molecules which have been pumped to an excited state. MASERs on a galactic scale come from dense hot clumps of molecular gas. There are various very well known MASER species OH, H20, CH3OH, and CH2O to name some of the most common. MASERs are found in a number of astrophysical settings like Star Forming Regions, Supernova remnants, and Late-Type Stars.
In the work we present the result of studying 44 galactic OH-MASERs using the Very Large Baseline Array (VLBA). Common transitions observed in OH-MASERs are the lines 1612 MHz, 1665 MHz, 1667 MHz, and 1720 MHz. The 1665 and 1667 MHz transitions are known as Main lines and are more common in Star Forming Regions while the 1612 and 1720 MHz transitions known as Satellite lines are common in Late-Type Stars. Generally Satellite lines are not found in Star Forming Regions. We studied the Main lines and Satellite lines of these OH-MASERs. Through the use of interferometric techniques we obtained high spatial and spectral resolution for our detections of MASER emission. This is the first time that high resolution observations have been done on many of these sources. We used this data and whether the Satellite lines appeared to study star formation processes in high-mass and low-mass Star Forming Regions. A correlation between satellite line emission and high-mass Star Forming Region could be helpful in the study of star formation processes.
Felli Derek
Migenes Victor
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