Statistics – Computation
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...423l..59a&link_type=abstract
Astrophysical Journal, Part 2 - Letters, vol. 423, no. 1, p. L59-L62
Statistics
Computation
59
Astronomical Models, Carbon Monoxide, Far Infrared Radiation, Infrared Astronomy, Interstellar Matter, Molecular Clouds, Radio Emission, Taurus Constellation, Computation, Histograms, Infrared Astronomy Satellite, Local Thermodynamic Equilibrium, Numerical Analysis, Velocity Distribution
Scientific paper
Infrared Astronomy Satellite (IRAS) images of the Taurus complex are presented. The map of the cold IR emission, emission with a low 60 to 100 micrometer color ratio, is dominated by a spectacular network of filament-like structures, with a typcial width equal to approximately 1 pc, including almost all star-forming regions. Comparable in angular resolution with the IRAS data, the velocity-integrated (13)CO (J = 1-0) molecular maps of the Taurus region obtained by Fukui & Mizuno (1991) at Nagoya (Japan) is strongly correlated with the cold component of the IR emission maps. We have analyzed the correlation inside small boxes whose size is 0.9 pc. The slope of regression line between the two emissions goes from 0.8 to 1.4 MJy sec/sr/K/km. Moreover, slope gradients are visible within given structures. Independent conversions of the (13)CO (J = 1-0) and the cold component emissions into H2 column densities show that the (13)CO and cold component emitting volumes are roughly comparable. This could explain the correlation and the limited range of values found for the regression line slope between the two emissions. The slope variations of a factor of approximately 2 with distances as small as our analysis box, i.e., 0.9 pc, should result from different physical properties of the dust or differences in (13)CO abundance, excitation, and radiation transfer conditions.
Abergel Alain
Boulanger Francois
Fukui Yasuo
Mizuno Akira
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