Search for variations of forbidden Fe VII 6087-A lines and forbidden Fe X 6375-A lines in high-ionization Seyfert galaxies
Results for the forbidden Fe X 6375-A and forbidden Fe VII 6087-A emission lines of 18 high-ionization active galaxies are presented and compared with spectra obtained with the same instrument. Variations of 6375-A and 6087-A were tested for various line ratios under the assumption of constant forbidden OI and forbidden S II line fluxes. The best candidate for variations of forbidden Fe VII and forbidden Fe X lines is found to be NGC 5548, with seven other galaxies showing possible variations of one or both of these lines. A timescale of less than 3 yr is noted for the variations in NGC 5548. Potential sources of error taken into account in the interpretation of the results are considered. 61 references.
- Research Organization:
- Lick Observatory, Santa Cruz, CA (USA)
- OSTI ID:
- 6969420
- Journal Information:
- Astron. J.; (United States), Vol. 95
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
SEYFERT GALAXIES
EMISSION SPECTRA
COMPARATIVE EVALUATIONS
COSMIC RADIO SOURCES
GALAXY NUCLEI
IONIZATION
IRON
METEOROLOGY
VARIABLE STARS
VARIATIONS
ELEMENTS
GALAXIES
METALS
SPECTRA
STARS
TRANSITION ELEMENTS
640105* - Astrophysics & Cosmology- Galaxies