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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

XMM-Newton observations of the low luminosity, radio-quiet quasar Markarian205 have revealed a unique iron K emission line profile. In marked contrast tothe broad and redshifted iron K line commonly seen in ASCA observations ofSeyfert 1 galaxies, we find that a substantial amount of the line flux in Mrk205 occurs above the neutral line energy of 6.4 keV. Furthermore, we find thatthe iron line emission has two distinct components, a narrow, unresolvedneutral line at 6.4 keV and a broadened line centred at 6.7 keV. We suggestthat the most likely origin of the 6.7 keV line is from X-ray reflection offthe surface of a highly ionised accretion disk, whilst the 6.4 keV componentmay arise from neutral matter distant from the black hole, quite possibly inthe putative molecular torus. Overall this observation underlines the potentialof XMM-Newton for using the iron K line as a diagnostic of matter in theinnermost regions of AGN.Comment: 6 pages, accepted for publication in Astronomy and Astrophysics  Letter

XMM-Newton observation of an unusual iron line in the quasar Markarian 205