Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-17
J.KoreanAstron.Soc.40:17-28,2007
Astronomy and Astrophysics
Astrophysics
12 pages, 10 eps figures, uses jkas.sty
Scientific paper
We present wide-field JHKs-band photometric observations of the three compact HII regions G48.9-0.3, G49.0-0.3, and G49.2-0.3 in the active star-forming region W51B. The star clusters inside the three compact HII regions show the excess number of stars in the J-Ks histograms compared with reference fields. While the mean color excess ratio E(J-H)/E(H-Ks) of the three compact HII regions are similar to ~ 2.07, the visual extinctions toward them are somewhat different: ~ 17 mag for G48.9-0.3 and G49.0-0.3; ~ 23 mag for G49.2-0.3. Based on their sizes and brightnesses, we suggest that the age of each compact HII region is =< 2 Myr. The inferred total stellar mass, ~ 1.4 x 10^4 M_sun, of W51B makes it one of the most active star forming regions in the Galaxy with the star formation efficiency of ~ 10 %.
Kim Hyosun
Koo Bon-Chul
Moon Dae-Sik
Nakajima Yasushi
Sung Hwankyung
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