Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560642c&link_type=abstract
American Astronomical Society, AAS Meeting #215, #606.42; Bulletin of the American Astronomical Society, Vol. 36, p.1137
Other
Scientific paper
Understanding the processes occurring in the nuclear disk of our own Galaxy (2 x 1.5 degrees of the Galactic center) is interesting not only for insight into our own Milky Way Galaxy, but also because it is the closest galactic nucleus. The nature of on-going star formation in the nuclear region, however, is not well-understood. In order to better understand this process, we searched for 6.7 GHz and 44 GHz methanol maser emission toward a sample of 30 green sources found within infrared dark clouds (IRDCS) toward the Galactic center. These sources, called 'green fuzzies' for how they appear in 3-color IRAC images (with 8 um in red, 4.5 um in green, and 3.6 um in blue), are likely sites of star formation. Methanol masers are also signposts of star formation throughout the Galaxy. Because both green fuzzies and methanol masers indicate star formation, determining how they correlate with one another may provide important insight into the nature of star formation in the Galactic center. We observed the radiatively excited class II methanol maser transition at 6.7 GHz using the new capability of the EVLA. These data were obtained using 3.125 MHz bandwith (140 km/s) and a channel width of 12.2 kHz (0.6 km/s). Each source was observed with two velocity centers (at +/- 50 km/s), for a total velocity coverage of 240 km/s. In addition, we observed the collisionally excited class I 44 GHz methanol maser transition, with 12.5 MHz bandwith (85 km/s) and a channel width of 195 kHz (1.3 km/s). Using two velocity centers, we achieved an effective coverage of 130 km/s. Here, we present the results of our methanol maser survey toward our sample of green fuzzies within IRDCs toward the Galactic center.
Chambers Edward Thomas
Roberts Dale
Yusef-Zadeh Farah
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