Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.3107p&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #31.07; Bulletin of the American Astronomical Society, Vol. 25, p.841
Astronomy and Astrophysics
Astronomy
Scientific paper
Hα luminosities of a small sample of barred ``hot spot'' galaxies are compared to IRAS properties. Several correlations are found, in particular between the strength of circumnuclear Hα emission and the 25-microns enhancement, confirming the hypothesis of Hawarden et al. (1986, {MNRAS,} 221, 41P) that the excess ``warm'' IRAS flux in barred spirals is due to vigorous circumnuclear star formation. A simple two-component model fit to the data indicates that both Lyman-continuum and Hα absorption are much higher in the hot spot regions than in disk HII regions. Circumnuclear star formation rates derived from corrected Hα luminosities are an order of magnitude greater than those derived assuming properties similar to disk HII regions, and if such rates are sustained by bar-driven gas inflow imply rapid evolution of the central regions of these galaxies.
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