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

Using Spitzer 3.6 micron data we derived the luminosity function and the massfunction of galaxies in five z>1.4 clusters selected to have a firmintracluster medium detection. The five clusters differ in richness(ISCSJ1438.1+3414 and XMMXCSJ2215.9-1738 are twice as rich as ISCSJ1432.4+3250,IDCSJ1426.5+3508, and JKCS041) and morphological appareance. At the medianredshift z=1.5, from the 150 member galaxies of the five clusters, we derived acharacteristic magnitude of 16.92+/-0.13 in the [3.6] band and a characteristicmass of lgM*=11.30+/-0.05 Msol. We find that the characteristic luminosity andmass does not evolve between z=1 and 1.4<z<1.8, directly ruling out ongoingmass assembly between these epochs because massive galaxies are already presentup to z=1.8. Lower-redshift build-up epochs have already been ruled out byprevious works, leaving only z>1.8 as a possible epoch for the mass build up.However, the observed values of m^* at very high redshift are too bright forgalaxies without any star formation immediately preceding the observed redshiftand therefore imply a star formation episode not earlier than z_f=2.5. For thefirst time, mass/luminosity functions are able to robustly distinguish tinydifferences between formation redshifts and to set {\it upper} limits to theepoch of the last star-formation episode.

Observational evidence that massive cluster galaxies were forming stars at z~2.5 and did not grow in mass at later times