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[O I] 63 micron Emission from High and Low Luminosity AGN Galaxies
Daniel A. Dale, George Helou, James R. Brauher +3
The Infrared Space Observatory was used to search for a tracer of the warm and dense neutral interstellar medium, the [O I] 63.18 micron line, in four ultraluminous IRAS sources ly…
Near-Infrared Integral Field Spectroscopy of Star-Forming Galaxies
Daniel A. Dale, Helene Roussel, Alessandra Contursi +9
The Palomar Integral Field Spectrograph was used to probe a variety of environments in nine nearby galaxies that span a range of morphological types, luminosities, metallicities, a…
Nascent starbursts in synchrotron-deficient galaxies with hot dust
H. Roussel, G. Helou, R. Beck +4
Three nearby galaxies which have abnormally high infrared to radio continuum ratios, NGC 1377, IC 1953 and NGC 4491, are investigated with a view to understanding the physical orig…
Infrared Emission of Normal Galaxies from 2.5 to 12 Microns: ISO Spectra, Near-Infrared Continuum and Mid-Infrared Emission Features
Nanyao Lu, George Helou, Michael W. Werner +6
We present ISO-PHOT spectra of the regions 2.5-4.9um and 5.8-11.6um for a sample of 45 disk galaxies from the U.S. ISO Key Project on Normal Galaxies. The spectra can be decomposed…
The bi-variate luminosity-color distribution of IRAS galaxies, and implications for the high redshift Universe
S. C. Chapman, G. Helou, G. F. Lewis +1
We present a characterization of the local luminosity-color, bi-variate distribution of IRAS galaxies from the 1.2Jy sample, selected at 60 micron. The S60/S100 infrared color is u…