Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.9705p&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #97.05; Bulletin of the American Astronomical Society, Vol. 24, p.1273
Astronomy and Astrophysics
Astronomy
Scientific paper
Using the new Infrared Sky Survey Atlas (ISSA), we have evaluated the average IR colors for several phases of galactic interstellar matter. The distributions of pixels in the IRAS band ratios R(12,100), R(60,100), R(25,60), and R(12,25) are evaluated, and distinct locations of points in the color-color diagrams were found among regions grouped into categories. The IR signatures of reflection nebulae, molecular clouds, material in open clusters, and high velocity clouds are examined, and the differences in the color-color ratios are analyzed for correlations with extinction, ISRF, and molecular content. The behavior of the color-color diagrams is calibrated with well-studied regions, and a color classification method for the interstellar medium is presented. Several new techniques of background subtraction, and image processing are used to prepare and analyze the color-color diagrams. It is found that the IRAS data of the ISSA survey, through improved resolution and improved signal to noise ratio, is capable of discerning subtle differences in the state of interstellar material, and can provide powerful diagnostic information in discovering new imbedded stars, high velocity clouds, and molecular clouds.
Helou George
Penprase Bryan Edward
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