Abstract
This paper reports on a study of UV and optical spectra of the active galaxy Fairall 9 taken as a part of the International AGN Watch database. CIV/Lyα, Lyα/Hs and Hα/Hs ratios have been measured at different radial velocities, which are varied across the line profiles. The ratio Lyα/Hs is low in the low-velocity centre of the lines, but increases a little in the high-velocity wings. The CIV/Lα and Hα/Hs line intensities ratios, however, are high at the line centre but become low in the wings. Modelling with the photoionization code CLOUDY shows that the observed line ratios can be described by two systems of clouds. One corresponds to the high-ionization line zone (HIL) with an electron density, ne∼ 108−10 cm−3. It is presumably located above the accretion disk or in the jets. The other system corresponds to the low-ionization line zone (LIL), which is probably a part of the accretion disk and which has a higher electron density, ne∼ 1012−13 cm−3. The possible geometry of the BLR in Fairall 9 is discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
