On the origin of the 40 - 120 micron emission of galaxy disks: a comparison with Hα fluxes.

March 1987 • 1987ApJ...314..513L

Authors • Lonsdale Persson, Carol J. • Helou, George

Abstract • 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.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=1987ApJ...314..513L
• NED https://ned.ipac.caltech.edu/uri/NED::InRefcode/1987ApJ...314..513L
• GIF http://articles.adsabs.harvard.edu/full/1987ApJ...314..513L
• ARTICLE http://articles.adsabs.harvard.edu/full/1987ApJ...314..513L?defaultprint=YES