Results 251 to 260 of about 160,296 (274)
Probing active galactic nuclei with H2O megamasers. [PDF]
Proc Natl Acad Sci U S A, 1995 Moran J +6 more
europepmc +1 more source
Directly observed relations in complete galaxy samples and the predictions of redshift-distance power laws. [PDF]
Proc Natl Acad Sci U S A, 1986 Segal IE.
europepmc +1 more source
X-ray spectral variability of the Seyfert 1 galaxy NGC 4051
, 1992 Hideyo Kunieda +5 more
openalex +1 more source
Observational validation of the chronometric cosmology: I. Preliminaries and the redshift-magnitude relation. [PDF]
Proc Natl Acad Sci U S A, 1975 Segal IE.
europepmc +1 more source
Soft X-ray properties of Seyfert galaxies. I - Spectra
, 1990 J. S. Kruper +2 more
openalex +1 more source
Isotopes and analogs of hydrogen--from fundamental investigations to practical applications. [PDF]
Sci Prog, 2013 Macrae RM.
europepmc +1 more source
On the origin of the Z-shaped narrow-line region in the Seyfert galaxy NGC 3516
, 1993 Sylvain Veilleux +2 more
openalex +1 more source
Progress and prospects in high energy astrophysics. [PDF]
Proc Natl Acad Sci U S A, 1975 Rees MJ.
europepmc +1 more source
High-excitation extranuclear gas in Seyfert galaxies
, 1991 Christopher A. Haniff +2 more
openalex +1 more source
X-ray observations of the Seyfert 1 galaxy MCG 2-58-22
, 1992 K. K. Ghosh, S. Soundararajaperumal
openalex +1 more source