On the origin of the 40-120 micron emission of galaxy disks A comparison with H-alpha fluxes

Details On the origin of the 40-120 micron emission of galaxy disks A comparison with H-alpha fluxes On the origin of the 40-120 micron emission of galaxy disks A comparison with H-alpha fluxes

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..513l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 15, 1987, p. 513-524.

Astronomy and Astrophysics

Astronomy

216

Disk Galaxies, Galactic Radiation, H Alpha Line, Infrared Astronomy, Astronomical Photometry, Data Sampling, Far Infrared Radiation, Flux Quantization, H Ii Regions, Spiral Galaxies

Scientific paper

The relationship between the integrated H-alpha flux and the far-IR flux of spiral disks is investigated. This relationship is found to have a similar dispersion to that between the far-IR and the blue flux, suggesting that the far-IR emission may be as closely linked to the interstellar radiation field from the old disk population as to very young OB associations. A large spread in the 60/100 micron color temperature and the IR excess (IRE) is found, and there is evidence that IRE decreases with increasing 60/100 micron color temperature. This supports the conclusion that nonionizing stars contribute to powering the far-IR emission. The far-IR spiral disk emission can be interpreted in terms of at least two thermal components with different temperatures. The low-IRE warm component comes from H II regions, while the high-IRE cool one is interpreted as 'cirruslike' emission. For the median spiral, cirruslike emission contributes 50-70 percent of the total far-IR flux of the disk.

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