Galaxies with Spectral Energy Distributions Peaking Near 60 micron.III. H(alpha) Imaging

Details Galaxies with Spectral Energy Distributions Peaking Near 60 micron.III. H(alpha) Imaging Galaxies with Spectral Energy Distributions Peaking Near 60 micron.III. H(alpha) Imaging

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110...87h&link_type=abstract

Astronomical Journal v.110, p.87

Astronomy and Astrophysics

Astronomy

22

Radio Continuum: Galaxies, Galaxies: Active

Scientific paper

We present the results of our Hα imaging survey of galaxies with far-infrared (FIR) spectral energy distributions (SEDs) peaking near 60 microns (60 PKs). The Hα emission is found to be strongly centrally concentrated, with a linear extent of at most a few kpc, similar to that of the radio continuum emission. The central concentration is more pronounced for Seyfert than H II region-like 60 PKs. For the former the extent of the Hα emitting region is comparable to the typical size of the narrow emission-line region of active galaxies. The central region of 60 PKs is thus dominated by a strong nonthermal or starburst source that is heavily obscured at optical wavelengths. The central ionizing source and the obscuring dust are responsible for the 60 PK phenomenon and the associated FIR emission and FIR to Hα luminosity ratio. These results support our interpretation of observational data presented in previous papers in this series [Vader et al. AJ, 106,1743(1993)]; Heisler & Vader, AJ, 107,35(1994)] that galaxies with far-infrared (FIR) spectral energy distributions peaking near 60 microns are undergoing a short-lived phase of central activity, resulting from an interaction/merger event.

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