Results 191 to 200 of about 160,296 (274)

Multiwavelength analysis of the variability of the blazar 3C 273. [PDF]

Mon Not R Astron Soc, 2020
Fernandes S, Patiño-Álvarez VM, Chavushyan V, Schlegel EM, Valdés JR.   +4 more
europepmc   +1 more source

Optical studies of the Seyfert 2 X-ray galaxy NGC 2110

, 1979
J. E. McClintock, Ronald A. Remillard, C. R. Canizares, P. Véron, J. van Paradijs   +4 more
openalex   +1 more source

8-13 m spectrophotometry of galaxies - IV. Six more Seyferts and 3C 345 [PDF]

, 1985
D. K. Aitken, P. F. Roche
openalex   +1 more source

A Search for the Redshifted Line of Neutral Hydrogen in Selected Quasi-Stellar Sources, N Galaxies, and Seyfert Galaxies

, 1971
W. A. Dent
openalex   +1 more source

Search for redshifted CH2O, H2O, O2, and NH3 in Seyfert galaxies and quasars [PDF]

, 1982
Demetrios Matsakis, J. M. Bologna, P. R. Schwartz, D. L. Thacker   +3 more
openalex   +1 more source

More Seyfert galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 1978
openaire   +2 more sources

Revisiting The Spectral and Timing Properties of NGC 4151. [PDF]

Astrophys J, 2019
Zoghbi A, Miller JM, Cackett E.
europepmc   +1 more source

Detection of iron features in the X-ray spectrum of the Seyfert I galaxy MCG-6-30-15 [PDF]

, 1989
K. Nandra, K. A. Pounds, G. C. Stewart, A. C. Fabian, M. J. Rees   +4 more
openalex   +1 more source

Nearby Seyfert galaxies

The Astrophysical Journal, 1980
M. P. Schwarz, H. J. Su, S. M. Simkin
openaire   +2 more sources

A small and vigorous black hole in the early Universe. [PDF]

Nature
Maiolino R, Scholtz J, Witstok J, Carniani S, D'Eugenio F, de Graaff A, Übler H, Tacchella S, Curtis-Lake E, Arribas S, Bunker A, Charlot S, Chevallard J, Curti M, Looser TJ, Maseda MV, Rawle TD, Rodríguez Del Pino B, Willott CJ, Egami E, Eisenstein DJ, Hainline KN, Robertson B, Williams CC, Willmer CNA, Baker WM, Boyett K, DeCoursey C, Fabian AC, Helton JM, Ji Z, Jones GC, Kumari N, Laporte N, Nelson EJ, Perna M, Sandles L, Shivaei I, Sun F.   +38 more
europepmc   +1 more source