Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...206...95d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 206, no. 1, Nov. 1988, p. 95-99. Research supported by the Caja de Ahorros de
Astronomy and Astrophysics
Astrophysics
39
Active Galactic Nuclei, Infrared Sources (Astronomy), Seyfert Galaxies, Star Formation, Far Infrared Radiation, H Beta Line, Nuclear Astrophysics, Starburst Galaxies
Scientific paper
The statistical properties of the emission of Seyfert 2 galaxies in the optical and mid- to far-IR are analyzed. The correlation between L(FIR)/L(IR) and I(100)/I(60) for these galaxies extends the one found by de Jong (1984) for 'normal' spirals into the region of higher L(FIR)/L(B) and higher color temperatures. This result, together with the lack of correlation between either L(FIR)/L(B) or 100-60 micron color temperature and any nuclear property, is consistent with an average higher rate of extended star formation in Seyfert 2 galaxies. There is a tight correlation between the nuclear H-beta luminosity and the luminosity at 25 microns, indicating that the bulk of the emission at 25 microns is of nuclear origin. There is an 'excess' of a factor five in the mean ratio (I(25)/I(100) of the sample with respect to the prediction for the emission at 25 microns by transient heating of small dust grains throughout the galactic disk.
Dultzin-Hacyan Deborah
Masegosa Josefa
Moles Mariano
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