Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725822p&link_type=abstract
American Astronomical Society, AAS Meeting #217, #258.22; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The study of the nucleus of the Milky Way Galaxy (2 x 1.5 degrees of the Galactic center) is an active area of research within the field of astronomy. There is good cause to this activity because our own galactic nucleus is also our best access to any galactic nucleus in the entire universe. The insight that has been gained from such studies of our own Galaxy has been invaluable in characterizing processes that occur within many other similar galaxies. However, star formation within the Galactic nucleus is not one of these well-understood processes. In order to understand the context of star formation within the Galactic nucleus in relation to star formation in the Galactic disk, we study the thermal dust emission from infrared dark clouds (IRDCs). IRDCs are commonly thought to represent the initial stage of high-mass star and cluster formation. Therefore, a difference between properties of Galactic center IRDCs and properties of Galactic disk IRDCs would represent a difference of the process of high-mass star formation between the two regions. To resolve this issue, we (1) identify IRDCs in the Galactic center region as regions of flux decrement relative to the background at 8 um, and (2) use submm (450 and 850 um) and 1.1 mm data toward Galactic center IRDCs to determine the fluxes of the IRDCs at these wavelengths. With the fluxes, we derive a range of possible temperatures and thermal dust emissivities in these clouds and compare them to Galactic disk IRDCs. Here, we present the results of our thermal dust emission study of 170 IRDCs in the central region of our Galaxy.
Chambers Erin
Phelan Scott
Yusef-Zadeh Farah
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