An isolated, well-defined infrared cirrus cloud

Details An isolated, well-defined infrared cirrus cloud An isolated, well-defined infrared cirrus cloud

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352..149h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, March 20, 1990, p. 149-158.

Astronomy and Astrophysics

Astronomy

16

Infrared Cirrus (Astronomy), Interstellar Matter, Milky Way Galaxy, Absorption Spectra, H Lines, Infrared Astronomy Satellite, Interstellar Gas, Spatial Resolution

Scientific paper

High spatial resolution H I measurements of a high-latitude FIR cirrus cloud (l = 9 deg, b = 51 deg) were obtained with the Arecibo 310 m telescope. The cloud is well isolated spatially and has a velocity well-separated from other H I clouds, providing an ideal laboratory for studying diffuse interstellar clouds. The Iv(100)/N(H) and Iv(60)/Iv(100) ratios are consistent with the Draine and Anderson model which includes a distribution of grain sizes down to 3 A. The small grains undergo transient heating and affect the 60 micron FIR continuum emission. Current models, however, underpredict Iv(12)/Iv(100) and Iv(25)/Iv(100) by more than a factor of 2. The effects small grains have on the thermal equilibrium of diffuse interstellar clouds are discussed.

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