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194 papers · 1 filter
Extended Ly-alpha emission from a damped Ly-alpha absorber at z = 1.93, and the relation between DLAs and Lyman-break galaxies
J. U. Fynbo, P. Moller, S. J. Warren
The number of damped Ly-alpha absorbers (DLAs) currently known is about 100, but our knowledge of their sizes and morphologies is still very sparse as very few have been detected i…
BL Lac Objects and Blazars: Past, Present, and Future
C. Megan Urry
The past 20 years have seen phenomenal progress in our understanding of BL Lac objects. They form part of the blazar class, which are radio-loud AGN whose relativistic jets are ali…
The Radio Emission of the Seyfert Galaxy NGC 7319
K. Aoki, G. Kosugi, A. S. Wilson +1
We present VLA maps of the Seyfert 2 galaxy NGC 7319 at 3.6, 6, and 20 cm. Sub-arcsecond resolution is achieved at 3.6 and 6 cm. The radio emission exhibits a triple structure on a…
Calibrating UV Emissivity And Dust Absorption At z \approx 3
Gerhardt R. Meurer, Timothy M. Heckman, Daniela Calzetti
We detail a technique for estimating the UV extinction and luminosity of UV selected galaxies using UV quantities alone. The technique is based on a tight correlation between the r…
On the absence of broad MgII emission-line variability in NGC 3516 during 1996
M. R. Goad, A. P. Koratkar, D. J. Axon +2
During the 1996 HST/FOS monitoring campaign of the Seyfert 1 galaxy NGC 3516, the UV continuum showed a factor of 5 variation; correspondingly the strongest broad UV emission lines…
New light on the origin of nebular HeII emission in young starbursts
Daniel Schaerer
We review the observations of nebular HeII 4686 emission in Local Group objects and extra-galactic HII regions. Different ionization mechanisms proposed to explain the unusually hi…