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Ground-based and HST optical-infrared studies of quasar host galaxies at low redshift
McLure, R. J.; Dunlop, J. S.; Hughes, D. H. +3 more
We describe the results from a series of ground-based and HST programs aimed at investigating the host galaxies of both radio-loud and radio-quiet quasars (RLQs & RQQs) and FRII radio galaxies (RGs) at low redshifts (0.1 < z < 0.3). Our results are in good agreement with those of other recent studies of host galaxies. In general the host…
Studies of the cosmic ray radial and latitudinal intensity gradients over the cycle 22 solar minimum period
Kunow, H.; Wibberenz, G.; Heber, B. +7 more
The spatial intensity gradients of galactic and anomalous cosmic ray helium are studied over the 1993.0-1998.0 time period using data from cosmic ray experiments on IMP 8, Ulysses, Voyagers 1 and 2 and Pioneer 10. When combined with the results of previous studies, a remarkable ordering of the radial gradients for the galactic component is found o…
Massive accretion disks in galactic nuclei
Scoville, N. Z.
In the luminous infrared galaxies, very large masses of interstellar matter have been concentrated in the galactic nuclei at radii less than 300 pc as a result of galactic merging, while in lower luminosity systems, this material is probably concentrated by stellar bars and viscous accretion. In both cases, the nuclear region will be highly obscur…
Disks in the Arp220 nuclei: modeling high resolution line and continuum observations
Genzel, R.; Tacconi, L. J.; Yun, M. S. +4 more
We model molecular and near-infrared emission from the central region of the ultra-luminous infrared galaxy Arp220. We use high angular resolution CO data taken with the Owens Valley millimeter array and NIR images from HST/NICMOS to compare with Monte Carlo line radiative transfer and scattering models. The models suggest that each one of the two…