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 present the first near-infrared (K'-band) homogeneous observations of acomplete sub-sample of the 3CR radio catalogue comprising all High ExcitationGalaxies (HEGs) at z<0.3. After showing that the surface brightnessdecomposition technique to measure central point-like sources is affected bysignificant uncertainties for the objects in the studied sample, we present anew, more accurate method based on the R-K' color profile. Via this method wefind a substantial nuclear K'-band excess in all but two HEGs -- most likelydirectly associated to their nuclear emission -- and we measure thecorresponding 2.12 $\mu$m nuclear luminosities. Within the frame of theunification scheme for radio-loud active galactic nuclei, it appears thatobscuration alone is not able to account for the different nuclear propertiesof the majority of the HEGs and Broad Line Radio Galaxies (BLRGs), and alsoscattering of the (optically) hidden nuclear light from a compact region mustbe invoked. More precisely, for ~70% of the HEGs the observed point-likeoptical emission is dominated by the scattered component, while in the K'-bandboth scattered and direct light passing through the torus contribute to theobserved nuclear luminosity. The estimated fraction of scattered light rangesfrom a few tenths to a few percent, while the torus extinction is between15<A_{V,torus}<50 mag with only a few exceptions with lower obscuration.

Probing the nuclear obscuration in radio-galaxies with near infrared imaging