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We present Hubble Space Telescope imaging and grism spectroscopy in the fieldof the distant galaxy cluster JKCS 041 using the Wide Field Camera 3. Weconfirm that JKCS 041 is a rich cluster and derive a redshift z=1.80 via thespectroscopic identification of 19 member galaxies, of which 15 are quiescent.These are centered upon diffuse X-ray emission seen by the Chandra observatory.As JKCS 041 is the most distant known cluster with such a large,spectroscopically confirmed quiescent population, it provides a uniqueopportunity to study the effect of the environment on galaxy properties atearly epochs. We construct high-quality composite spectra of the quiescentcluster members that reveal prominent Balmer and metallic absorption lines.Using these, we measure the mean stellar ages in two bins of stellar mass. Thequiescent cluster members' ages agree remarkably closely with that inferred byWhitaker et al. for similarly selected samples in the field, supporting theidea that the cluster environment is more efficient at truncating starformation while not having a strong effect on the mean epoch of quenching. Wefind some evidence (90% confidence) for a lower fraction of disk-like quiescentsystems in JKCS 041 compared to a sample of coeval field galaxies drawn fromthe CANDELS survey. Taking this into account, we do not detect a significantdifference between the mass-radius relations of the quiescent JKCS 041 membersand our z~1.8 field sample. Finally, we demonstrate how differences in themorphological mixture of quenched systems can complicate measures of theenvironmental dependence of size growth.

astrophysical journal/the astrophysical journal

Spectroscopic Confirmation of the Rich z=1.80 Galaxy Cluster JKCS 041  Using the WFC3 Grism: Environmental Trends in the Ages and Structure of  Quiescent Galaxies