English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We obtained far-ultraviolet spectra of the Seyfert 1 galaxy NGC 7469 usingthe FUSE on 1999 December 6. Our spectra cover the wavelength range 990-1187 Awith a resolution of 0.05 A. We see broad emission lines of CIII, NIII, OVI,and HeII as well as intrinsic absorption lines in the OVI 1032,1038 resonancedoublet. The absorption arises in two distinct kinematic components at systemicvelocities of -569 km/s and -1898 km/s. Both components are very highlyionized- no significant Ly beta absorption is present. The higher blueshiftcomponent is not quite saturated, and it has a total OVI column density of8e14/cm2. It covers more than 90% of the continuum and broad-line emission. Thelower blue shift component is heavily saturated and covers only 50% of thecontinuum and broad-line emission. It too has a column density of 8e14/cm2, butthis is less certain due to the high saturation. We set an upper limit of<1.5e18/cm2 on the OVI column density of this component. Its line depth isconsistent with coverage of only the continuum, and thus this component may lieinterior to the broad emission-line gas. The component at -569 km/s has avelocity comparable to the high-ionization X-ray absorption lines seen in theXMM-Newton grating spectrum of NGC 7469, and photoionization models show thatthe observed column densities of OVI and HI are compatible with their formationin the same gas as that causing the X-ray absorption. The gas at -1898 km/s haslower ionization and column density, and no significant X-ray absorption isassociated with it.Comment: To appear in Astronomy & Astrophysics. 8 pages, 2 color PostScript  figures. This paper is a companion to one discussing X-ray and UV  observations of NGC 7469 with XMM-Newton by A. Blustin et al., listed at  astro-ph/030255

Multiwavelength studies of the Seyfert 1 galaxy NGC 7469 I. Far UV observations with FUSE