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 deep Hubble Space Telescope Wide Field Camera 3 slitlessspectroscopic observations of the distant cluster Cl J1449+0856. These cover asingle pointing with 18 orbits of G141 spectroscopy and F140W imaging, allowingus to derive secure redshifts down to m_140~25.5 AB and 3sigma line fluxes of5*10^(-18) erg/s/cm^2. In particular, we were able to spectroscopically confirm12 early-type galaxies in the field up to z~3, 6 of which in the cluster core,which represents the first direct spectroscopic confirmation of passivegalaxies in a z=2 cluster environment. With 140 redshifts in a ~6 arcmin^2field, we can trace the spatial and redshift galaxy distribution in the clustercore and background field. We find two strong peaks at z=2.00 and z=2.07, whereonly one was seen in our previously published ground-based data. Thanks to thespectroscopic confirmation of the cluster ETGs, we can now re-evaluate theredshift of Cl J1449+0856 at z=2.00, rather than z=2.07, with the backgroundoverdensity being revealed to be sparse and "sheet"-like. This presents aninteresting case of chance alignment of two close yet unrelated structures,each one preferentially selected by different observing strategies. With 6quiescent or early-type spectroscopic members and 20 star-forming ones, ClJ1449+0856 is now reliably confirmed to be at z=2.00. The identified memberscan now allow for a detailed study of galaxy properties in the densestenvironment at z=2.

WFC3 grism confirmation of the distant cluster Cl J1449+0856 at z=2.00: Quiescent and star-forming galaxy populations