The Cold, Massive Molecular Cloud G216-2.5. III. Infrared Properties

Details The Cold, Massive Molecular Cloud G216-2.5. III. Infrared Properties The Cold, Massive Molecular Cloud G216-2.5. III. Infrared Properties

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...472..275l&link_type=abstract

Astrophysical Journal v.472, p.275

Astronomy and Astrophysics

Astronomy

7

Infrared: Ism: Continuum, Ism: Clouds, Ism: Individual Alphanumeric: G216-2.5, Stars: Formation

Scientific paper

We present results concerning the star-forming activities and dust properties of the unusual giant molecular cloud G216-2.5. As suggested by earlier CO observations, we confirm that this cloud is unusually cold for a GMC and shows no evidence for massive star formation. The average temperature of the dust based on the extended emission at 60 and 100 μm is 22-26 K. We attribute this low value to the lack of substantial internal heating sources. Dust heating in the cloud is probably dominated by the interstellar radiation field. Near-infrared imaging of the IRAS point sources seen toward G216-2.5 reveal at least four sites of low-luminosity, and presumably low-mass, star formation within the cloud. All four sites lie preferentially toward the edge of the cloud. Two small groupings of stars are identified as the near-infrared counterparts to two of the IRAS point sources, and the group members may be similar to T Tauri stars. Somewhat more luminous and massive stars appear to be associated with two other IRAS point sources. Even the most luminous star formation site in G2t6 -2.5 has a far-infrared luminosity of only 300 Lsun.

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