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 an infrared study of a z=0.872 cluster, SpARCS J161314+564930,with the primary aim of distinguishing the dynamical histories ofspectroscopically confirmed star-forming members to assess the role of clusterenvironment. We utilize deep MIPS imaging and a mass-limited sample of 85spectroscopic members to identify 16 24um-bright sources within the cluster,and measure their 24um star formation rates (SFRs) down to ~6 Msolar/year.Based on their line-of-sight velocities and stellar ages, MIPS cluster membersappear to be an infalling population that was recently accreted from the fieldwith minimal environmental dependency on their star formation. However, weidentify a double-sequenced distribution of star-forming galaxies amongst themembers, with one branch exhibiting declining specific SFRs with mass. Themembers along this sub-main sequence contain spectral features suggestive ofpassive galaxies. Using caustic diagrams, we kinematically identify thesegalaxies as a virialized and/or backsplash population. Moreover, we find a mixof dynamical histories at all projected radii, indicating that standarddefinitions of environment (i.e., radius and density) are contaminated withrecently accreted interlopers, which could contribute to a lack ofenvironmental trends for star-forming galaxies. A cleaner narrative of theirdynamical past begins to unfold when using a proxy for accretion historiesthrough profiles of constant (r/r_200)x(Delta v/sigma_v); galaxies accreted atearlier times possess lower values of (r/r_200)x(Delta v/sigma_v) with minimalcontamination from the distinct infalling population. Therefore, adopting atime-averaged definition for density (as traced by accretion histories) ratherthan an instantaneous density yields a depressed specific SFR within thedynamical cluster core.

A Kinematic Approach To Assessing Environmental Effects: Star-Forming Galaxies in a z~0.9 SpARCS cluster using Spitzer 24um Observations