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 quantify the effects of \emph{morphological k-correction} at $1<z<2$ bycomparing morphologies measured in the K and I-bands in the COSMOS area.Ks-band data have indeed the advantage of probing old stellar populations for$z<2$, enabling a determination of galaxy morphological types unaffected byrecent star formation. In paper I we presented a new non-parametric method toquantify morphologies of galaxies on seeing limited images based on supportvector machines. Here we use this method to classify $\sim$$50 000$ $Ks$selected galaxies in the COSMOS area observed with WIRCam at CFHT. The obtainedclassification is used to investigate the redshift distributions and numbercounts per morphological type up to $z\sim2$ and to compare to the resultsobtained with HST/ACS in the I-band on the same objects from other works. Weassociate to every galaxy with $Ks<21.5$ and $z<2$ a probability between 0 and1 of being late-type or early-type. The classification is found to be reliableup to $z\sim2$. The mean probability is $p\sim0.8$. It decreases with redshiftand with size, especially for the early-type population but remains above$p\sim0.7$. The classification is globally in good agreement with the oneobtained using HST/ACS for $z<1$. Above $z\sim1$, the I-band classificationtends to find less early-type galaxies than the Ks-band one by a factor$\sim$1.5 which might be a consequence of morphological k-correction effects.We argue therefore that studies based on I-band HST/ACS classifications at$z>1$ could be underestimating the elliptical population. [abridged]

astronomy and astrophysics

A robust morphological classification of high-redshift galaxies using  support vector machines on seeing limited images. II. Quantifying  morphological k-correction in the COSMOS field at 1<z<2: Ks band vs. I band