HFE 2 and L 43 - Two cold far-infrared sources

Details HFE 2 and L 43 - Two cold far-infrared sources HFE 2 and L 43 - Two cold far-infrared sources

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86..276n&link_type=abstract

Astronomical Journal, vol. 86, Feb. 1981, p. 276-279. Swedish Board for Space Activities

Astronomy and Astrophysics

Astronomy

2

Cosmic Dust, Far Infrared Radiation, Interstellar Gas, Molecular Clouds, Temperature, Carbon Isotopes, Carbon Monoxide, Orion Nebula

Scientific paper

The molecular clouds HFE 2 and L 43 have been observed at far-infrared wavelengths with an angular resolution of 4.5 arcmin. A scan of length 30 arcmin in the band 114-196 microns through the CO peak of HFE 2 shows roughly constant emission of 400 Jy/beam extending over 20 arcmin along the scan. The average dust temperature is greater than 23 K, well above the normal 'interstellar' value. Possible heat sources such as embedded low-luminosity stars or excessive external radiation from the Orion OB1 association are discussed. L 43 was mapped over a 30 arcmin x 20 arcmin region in two bands, 72-94 and 114-196 microns. The peak flux density is 250 Jy/beam and implies a dust temperature of approximately 15 K. Two stars associated with faint nebulosity, which are seen projected on the front surface of the cloud, probably contribute to the heating of the dust.

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