Search Publications

The role of stars in the energetics of LINERs

Maoz, Dan

Imaging studies have shown that ~ 25% of LINER galaxies display a compact nuclear UV source. I compare the HST ultraviolet (1150-3200 Å) spectra that are now available for seven such ``UV-bright'' LINERs. The spectra of NGC 404, NGC 4569, and NGC 5055 show clear absorption-line signatures of massive stars, indicating a stellar origin for the UV co…

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…

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…