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

This is the second of two papers describing the second data release (DR2) ofthe Australia Telescope Large Area Survey (ATLAS) at 1.4 GHz. In Paper I wedetailed our data reduction and analysis procedures, and presented cataloguesof components (discrete regions of radio emission) and sources (groups ofphysically associated radio components). In this paper we present our keyobservational results. We find that the 1.4 GHz Euclidean normaliseddifferential number counts for ATLAS components exhibit monotonic declines inboth total intensity and linear polarization from millijansky levels down tothe survey limit of ~100 uJy. We discuss the parameter space in which componentcounts may suitably proxy source counts. We do not detect any components orsources with fractional polarization levels greater than 24%. The ATLAS dataare consistent with a lognormal distribution of fractional polarization withmedian level 4% that is independent of flux density down to total intensity ~10mJy and perhaps even 1 mJy. Each of these findings are in contrast to previousstudies; we attribute these new results to improved data analysis procedures.We find that polarized emission from 1.4 GHz millijansky sources originatesfrom the jets or lobes of extended sources that are powered by an activegalactic nucleus, consistent with previous findings in the literature. Weprovide estimates for the sky density of linearly polarized components andsources in 1.4 GHz surveys with ~10" resolution.

ATLAS 1.4 GHz Data Release 2 -- II. Properties of the faint polarized sky