Physics – Optics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..471a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Dec. 1, 1990, p. 471-495.
Physics
Optics
144
Far Infrared Radiation, Galactic Structure, H Ii Regions, Infrared Sources (Astronomy), Light Emission, Astronomical Photometry, Brightness Distribution, Cassegrain Optics, Charge Coupled Devices, Emission Spectra, Line Spectra
Scientific paper
The narrow-band H-alpha + forbidden N II images of 30 galaxies selected to have far-IR spectral energy distributions similar to the prototype far-infrared galaxies (FIRGs) Arp 220, NGC 6240, and M82 have been analyzed in order to determine the luminosities, morphologies, and ultimate energy source of emission-line nebulae that reside within powerful FIRGs. The emission-line nebulae of these IR color-selected FIRGs as a class are large, with a mean half-light radius of about 1.3 kpc and mean maximum diameter of about 16 kpc. They have morphologies ranging from smooth and structureless to highly complex and chaotic, with some showing evidence for ordered structure on scales of a few kpc to tens of kpc. Only about 25 percent of the nearby FIRGs display morphologies suggesting that large H II region contribute significantly to their appearance in H-alpha + forbidden N II.
Armus Lee
Heckman Timothy M.
Miley George K.
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