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

Low-frequency radio surveys allow in-depth studies and new analyses ofclasses of sources previously known and characterised only in other bands. Inrecent years, low radio frequency observations of blazars have been availablethanks to new surveys, such as the GaLactic and Extragalactic All-sky MWASurvey (GLEAM). We search for gamma-ray blazars in a low frequency (${\nu}$ <240MHz) survey, to characterise the spectral properties of the spatialcomponents. We cross-correlate GLEAM with the fourth catalogue of activegalactic nuclei (4LAC) detected by the Fermi satellite. This improves overprevious works using a low frequency catalogue that is wider, deeper, with abetter spectral coverage and the latest and most sensitive gamma-ray sourcelist. In comparison to the previous study based on the commissioning survey,the detection rate increased from 35% to 70%. We include Australia Telescope20GHz (AT20G) Survey data to extract high-frequency high-angular resolutioninformation on the radio cores of blazars. We find low radio frequencycounterparts for 1274 out of 1827 blazars in the 72-231 MHz range. Blazars haveat spectrum at $\sim$ 100MHz regime, with a mean spectral index ${\alpha}$ =-0.44 +-0.01 (assuming S $\propto$ ${\nu}^ {\alpha}$ ). Low synchrotron peakedobjects have a scatter spectrum than high synchrotron peaked objects. Lowfrequency radio and gamma-ray emission show a significant but scatteredcorrelation. The ratio between lobe and core radio emission in gamma-rayblazars is smaller than previously estimated.

Radio spectral properties of cores and extended regions in blazars in the MHz regime