The Thumbprint nebula: The distribution of molecular gas and dust in a regular BOK globule

Details The Thumbprint nebula: The distribution of molecular gas and dust in a regular BOK globule The Thumbprint nebula: The distribution of molecular gas and dust in a regular BOK globule

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295..487l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 2, p. 487-503

Astronomy and Astrophysics

Astronomy

15

Cosmic Dust, Globules, Infrared Astronomy, Interstellar Extinction, Interstellar Gas, Interstellar Matter, Molecular Clouds, Molecular Gases, Nebulae, Radio Astronomy, Brightness Distribution, Carbon Monoxide, Extremely High Frequencies, Infrared Astronomy Satellite, Millimeter Waves

Scientific paper

We have studied a regular bright-rimmed globule called Thumbprint Nebula, TPN, (size approximately 0.18 pc, distance approximately 200 pc) in millimeter molecular lines (CO isotopic lines), at optical wavelengths (scanned Schmidt plates) and at infrared wavelengths (IRAS maps and scans). The molecular line observations have been made with the Swedish-ESO Submillimeter Telescope (SEST) in (12)CO (J = 1-0) and (J = 2-1), (13)CO (J = 1-0) and (J = 2-1), C(18)O (J = 1-0), C(17)O (J = 1-0), CS (J = 2-1) and HNC (J = 1-0) transitions. These observations reveal a centrally condensed cloud with an excitation temperature of Tex approximately equal to 6.6 K, and a mass of 6 solar mass. There is indication of a cloud rotation with a rotation rate of approximately 0.6 km/s/pc, as measured using (13)CO lines. Optical surface brightness distribution as measured from blue and red European Southern Observatory (ESO/SRC) Schmidt plates has been used to determine the distribution of the dust particles in comparison with the distribution of the gas component. The position of the surface brightness minimum, which corresponds to the dust density maximum, is found to be about 40 sec to 50 sec north of the (13)CO and C(18)O column density maximum. We have made infrared surface brightness maps using the IRAS Sky Survey Atlas (ISSA) survey plates at 12, 25, 60 and 100 micrometers and extracted individual IRAS scans crossing the TPN. The globule is seen at 100 and 60 micrometers but the dust is apparently too cold to be visible at shorter wavelengths.

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