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5 papers · 2 filters
Extragalactic water masers in bright IRAS sources
A. Tarchi, C. Henkel, A. B. Peck +3
We report the results of a search for 22 GHz water maser emission in IRAS-bright galaxies, using the 100-m Effelsberg telescope. In particular, we present the details of four new m…
The AGN Content of Ultraluminous IR Galaxies: High Resolution VLA Imaging of the IRAS 1Jy ULIRG Sample
Neil M. Nagar, Andrew S. Wilson, Heino Falcke +2
This paper presents the results of a high resolution radio imaging survey of 83 of the 118 ultraluminous infrared galaxies (ULIRGs) in the IRAS 1 Jy ULIRG sample. We have observed…
Evolution of the Nuclear Accretion Disk Emission in NGC 1097: Getting Closer to the Black Hole
T. Storchi-Bergmann, R. Nemmen, M. Eracleous +5
We study the evolution of the broad, double-peaked Halpha emission-line profile of the LINER/Seyfert 1 nucleus of NGC 1097, using 24 spectra obtained over a time span of 11 yrs - f…
Elusive Active Galactic Nuclei
R. Maiolino, A. Comastri, R. Gilli +8
A fraction of active galactic nuclei do not show the classical Seyfert-type signatures in their optical spectra, i.e. they are optically "elusive". X-ray observations are an optima…
Early star formation traced by the highest redshift quasars
R. Maiolino, Y. Juarez, R. Mujica +2
The iron abundance relative to alpha-elements in the circumnuclear region of quasars is regarded as a clock of the star formation history and, more specifically, of the enrichment…