Emission line variation in the Seyfert galaxy Fairall 9 and the presence of broad [O III] emission
1989 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 211, no 2, 310-314314 p.Article in journal (Refereed) Published
The authors present two high quality spectra of the Hbeta region in the Seyfert 1 galaxy Fairall 9, separated by a period of 4 years. The variation of the broad lines is discussed, and in particular that of the Fe II lines of multiplet 42. The difference spectrum shows clearly Fe II (42) lambda 5018 and lambda 5169 with equal intensity. There is a strong, broad (4000 km s -1) wing present under the [O III] lambda 5007 line, which varied only by a small amount. The authors show that this variation is entirely due to the variation of Fe II lambda 5018 and that the remainder of the [O III]-wing has not varied. On this basis the authors argue that the wing is not caused by the Fe II (42) lambda 5018 line, nor by any other Fe II lines, but that they are observing high velocity [O III]-emitting material. From the lack of variation in this component a minimum distance to the source can be set of 1.3 pc. Other features of the difference spectrum are also discussed
Place, publisher, year, edition, pages
1989. Vol. 211, no 2, 310-314314 p.
Experimental/ astronomical spectra, iron, oxygen, Seyfert galaxies, visible astronomical observations/ visible, forbidden line, O III, AD 1982, AD 1987, Seyfert galaxy, Fairall 9, spectra, Hbeta region, broad lines, Fe II, 500.7 to 516.9 nm, O, Fe/ A9850R Active and peculiar galaxies A9850G Radiation and spectra of galaxies A9580J Photographic region astronomical observations/ wavelength 5.007E-07 to 5.169E-07 m/ O/el, Fe/el
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:uu:diva-197178ISI: 3381359OAI: oai:DiVA.org:uu-197178DiVA: diva2:611960