A Rich Star-forming Region in the Direction of RCW 95

Details A Rich Star-forming Region in the Direction of RCW 95 A Rich Star-forming Region in the Direction of RCW 95

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....128.2364r&link_type=abstract

The Astronomical Journal, Volume 128, Issue 5, pp. 2364-2373.

Astronomy and Astrophysics

Astronomy

4

Ism: Dust, Extinction, Ism: H Ii Regions, Infrared: Stars, Stars: Formation, Stars: Pre-Main-Sequence

Scientific paper

Near-IR imaging in the direction of the IRAS 15408-5356 point source, which is associated with the RCW 95 H II region, revealed a young and massive stellar cluster. We detected 136 member candidates up to our completeness limit, embedded in an infrared nebula and concentrated in an area of about 3 pc2. About 60% of the candidates detected in all three of the J, H, and K bands present infrared excess at 2.2 μm. The UV photons provided by the most massive stars are enough to explain the observed free-free emission at radio wavelengths and the integrated infrared luminosity produced by the heated dust. The near-IR counterpart of the IRAS point source was identified using a more accurate position from the Midcourse Space Experiment (MSX) catalog; it coincides with the peak of emission in the MSX mid-IR bands. The measured integrated flux density of the infrared nebula at the K band is compatible with the expected free-free emission derived from the radio data, but an excess at the J and H bands was detected and may be due to either nonhomogeneous absorption across the nebula or to the presence of scattered stellar light, more prominent at smaller wavelengths.
Based on observations made at Laboratório Nacional de Astrofisica/MCT, Brazil.

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