Results 201 to 210 of about 77,605 (280)

Steps toward Determination of the Size and Structure of the Broad‐Line Region in Active Galactic Nuclei. XV. Long‐Term Optical Monitoring of NGC 5548 [PDF]

open access: bronze, 1999
B. M. Peterson   +36 more
openalex   +1 more source

Optical Variability of Active Galactic Nuclei

open access: yesFrontiers in Astronomy and Space Sciences, 2017
Szymon Kozłowski
doaj   +1 more source

Stephen Hawking's Warning on Contacting Aliens: A Physics Perspective on the Intelligence Trap. [PDF]

open access: yesJ Biomed Phys Eng
Mortazavi SMJ   +4 more
europepmc   +1 more source

Quasars and active galactic nuclei: high resolution radio imaging. [PDF]

open access: yesProc Natl Acad Sci U S A, 1995
Cohen MH, Kellermann KI.
europepmc   +1 more source

Warm absorbers in active galactic nuclei [PDF]

open access: bronze, 1995
C. S. Reynolds, A. C. Fabian
openalex   +1 more source

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