Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004acasn..45....1f&link_type=abstract
Acta Astronomica Sinica, vol. 45, no. 1, p. 1-15
Astronomy and Astrophysics
Astronomy
2
Infrared Imaging, Star Formation, Young Cluster, Ggd12-15
Scientific paper
Near infrared imaging of the star forming region GGD12-15 is presented with the JHK broad-band and H2 v=1-0 S(1) narrow-band filters. The images reveal the dense young cluster and nebulae associated with the cluster in the field, and uncover the cluster outflow activity by the H 2 line knot emission. Most of the infrared point sources are invisible in optical. The photometry of 76 point sources displays 32 sources with infrared excess, in which five show characteristics of protostars, indicating strong star formation activity in the cloud. The color-magnitude diagram show a ratio of ~10%---26% massive cluster members as outlined by B8 spectral type. The K' magnitude distribution has a flat distribution in 13.0mag---16.0mag, with the peak at 15.0mag. The [H-K'] color distribution has a peak at ~0.7mag, and the redder cluster members take percentage of 70%. The H2 knots are observed around the central cluster, and the distribution shows a strong relationship with the strong star formation activity. Five H2 knots are discovered in the central area of CO outflow, indicating the same powering source with the molecular outflow.
Fang Maofa
Yao Yong-Qiang
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