Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...295..394p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 295, Aug. 15, 1985, p. 394-401.
Astronomy and Astrophysics
Astrophysics
24
Astronomical Spectroscopy, Emission Spectra, Molecular Clouds, Quasars, Active Galaxies, Astronomical Models, Cooling, Gas Density, H Lines, Line Spectra
Scientific paper
A range of simple theoretical models is presented which explores the effects of high densities in the broad-line clouds on near-IR free-free emission. These calculations demonstrate in a qualitiative way that large near-IR fluxes can result from high densities without compromising the observed hydrogen line spectrum. It is suggested that high density in the emission-line region provides a plausible explanation of several features seen in the spectra of QSOs and active galaxies, including (1) the 3-micron bump and/or the near-IR spectral break seen in many QSOs, (2) the low observed Pa-alpha broad-line fluxes seen in some objects, and (3) the highly depressed Br-gamma broad-line fluxes seen in active galaxies. It is also found that free-free emission in such clouds can be an important coolant.
Hubbard E. N.
Puetter Richard C.
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