Other
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..347o&link_type=abstract
Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam
Other
Scientific paper
Near-infrared observations of the central part of W51 (G49.5-0.4) have been carried out. We obtained imaging data over an area of 15 squared arcminutes, centered near W51 IRS 2. K-band spectroscopic data were also obtained for selected objects in this area. More than 7000 point sources were detected from our imaging data, and we identified about 170 sources as physically associated with G49.5-0.4 star forming region. Ages of the HII regions were inferred from the sizes of nebulosities on the Brγ image. Coupling the information of the age of HII region and the luminosity of exciting star, we estimated the mass and age for each source, and derived Initial Mass Function of massive stars in G49.5-0.4. In the mass range between 10 Modot and 30 Modot, the IMF slope is consistent with the value 1.8, which is derived for field stars. However, there is an excess of stellar population in the range above 30 Modot. We also defined four subgroups in this region. In the youngest group, 17 O stars were born during the last 0.8 Myr. The massive star forming activity of this group is more violent than any other visible Galactic HII regions.
Mori Atsushi
Nishihara Eiji
Okumura Soichirou
Watanabe Eiichiro
Yamashita Toshifumi
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