Dust emissivity in the Submm/Mm: SCUBA and SIMBA observations of Barnard 68

Details Dust emissivity in the Submm/Mm: SCUBA and SIMBA observations of Barnard 68 Dust emissivity in the Submm/Mm: SCUBA and SIMBA observations of Barnard 68

2003-01-20

arxiv.org/abs/astro-ph/0301386v1

Astron.Astrophys. 399 (2003) L43-L46

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, A&A accepted (Letter), referee format

Scientific paper

10.1051/0004-6361:20030078

We have observed the dark cloud Barnard 68 with SCUBA at 850 um and with SIMBA at 1.2 mm. The submillimetre and millimetre dust emission correlate well with the extinction map of Alves, Lada and Lada (2001).The A_V/850um correlation is clearly not linear and suggests lower temperatures for the dust in the inner core of the cloud. Assuming a model for the temperature gradient, we derive the cloud-averaged dust emissivities (normalised to the V-Band extinction efficiency) at 850 um and 1.2 mm. We find k_850um/k_V = 4.0 +/- 1.0 x 10^-5 and k_1.2mm/k_V = 9.0 +/- 3.0 x 10^-6. These values are compared with other determinations in this wavelength regime and with expectations for models of diffuse dust and grain growth in dense clouds.

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