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 a stable procedure for defining and measuring the two point angular autocorrelation function,   w (θ) =[θ/θ 0 ( V )] −Γ  , of faint  (25 &lt;  V  &lt; 29) , barely resolved and unresolved sources in the  Hubble Space Telescope  Great Observatories Origins Deep Survey and Ultra Deep Field data sets. We construct catalogues that include close pairs and faint detections. We show, for the first time, that, on subarcsec scales, the correlation function exceeds unity. This correlation function is well fit by a power law with index  Γ≈ 2.5  and a  θ 0 = 10 −0.1( V −25.8)  arcsec . This is very different from the values of  Γ≈ 0.7  and  θ 0 ( r ) = 10 −0.4( r −21.5)  arcsec  associated with the gravitational clustering of brighter galaxies. This observed clustering probably reflects the presence of giant star‐forming regions within galactic‐scale potential wells. Its measurement enables a new approach to measuring the redshift distribution of the faintest sources in the sky.

A measurement of the faint source correlation function in the GOODS and UDF surveys