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

We report on simultaneous optical and X‐ray observations of the Seyfert galaxy, NGC 3147. The  XMM–Newton  spectrum shows that the source is unabsorbed in the X‐rays  ( N  H  &lt; 5 × 10 20  cm −2 ) . On the other hand, no broad lines are present in the optical spectrum. The origin of this optical/X‐rays misclassification (with respect to the Unification Model) cannot be attributed to variability, since the observations in the two bands are simultaneous. Moreover, a Compton‐thick nature of the object can be rejected on the basis of the low‐equivalent width of the iron Kα line (≃130 eV) and the large ratio between the 2–10 keV and the [O  iii ] fluxes. It seems therefore inescapable to conclude that NGC 3147 intrinsically lacks the Broad‐Line Region, making it the first ‘true’ type 2 Seyfert galaxy.

NGC 3147: a ‘true’ type 2 Seyfert galaxy without the broad‐line region