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 investigate star formation in DLSCL J0916.2+2953, a dissociative merger oftwo clusters at z=0.53 that has progressed $1.1^{+1.3}_{-0.4}$ Gyr since firstpass-through. We attempt to reveal the effects a collision may have had on theevolution of the cluster galaxies by tracing their star formation history. Weprobe current and recent activity to identify a possible star formation eventat the time of the merger using EW(Hd), EW([OII]), and D$_{n}$4000 measuredfrom the composite spectra of 64 cluster and 153 coeval field galaxies. Wesupplement $Keck$ DEIMOS spectra with DLS and $HST$ imaging to determine thecolor, stellar mass, and morphology of each galaxy and conduct a comprehensivestudy of the populations in this complex structure. Spectral results indicatethe average cluster and cluster red sequence galaxies experienced no enhancedstar formation relative to the surrounding field during the merger, ruling outa predominantly merger-quenched population. We find that the average bluegalaxy in the North cluster is currently active and in the South cluster iscurrently post-starburst having undergone a recent star formation event. Whilethe North activity could be latent or long-term merger effects, a young bluestellar population and irregular geometry suggest the cluster was still formingprior the collision. While the South activity coincides with the time of themerger, the blue early-type population could be a result of secular clusterprocesses. The evidence suggests that the dearth or surfeit of activity isindiscernible from normal cluster galaxy evolution.

Star Formation In The Cluster Merger DLSCL J0916.2+2953