Search for variations of forbidden Fe VII 6087-A lines and forbidden Fe X 6375-A lines in high-ionization Seyfert galaxies

Journal Article · Wed Jun 01 04:00:00 EDT 1988 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/114766· OSTI ID:6969420

Veilleux, S

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), Journal Name: Astron. J.; (United States) Vol. 95; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPARATIVE EVALUATIONS
COSMIC RADIO SOURCES
ELEMENTS
EMISSION SPECTRA
GALAXIES
GALAXY NUCLEI
IONIZATION
IRON
METALS
METEOROLOGY
SEYFERT GALAXIES
SPECTRA
STARS
TRANSITION ELEMENTS
VARIABLE STARS
VARIATIONS