Star formation in the cluster merger DLSCL J0916.2+2953

Mansheim, A. S.; Lemaux, B. C.; Dawson, W. A.; Lubin, L. M.; Wittman, D.; Schmidt, S.

doi:10.3847/1538-4357/834/2/205

Title: Star formation in the cluster merger DLSCL J0916.2+2953

Journal Article · Fri Jan 13 04:00:00 UTC 2017 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/834/2/205 · OSTI ID:1430966

^[1]; Lemaux, B. C. ^[1];

^[2]; Lubin, L. M. ^[1];

^[3]; Schmidt, S. ^[1]

Univ. of California, Davis, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California, Davis, CA (United States); Univ. de Lisboa, Lisbon (Portugal)

We investigate star formation in DLSCL J0916.2+2953, a dissociative merger of two clusters at z=0.53 that has progressed 1:1^+1.3_-0.4 Gyr since rst pass-through. We attempt to reveal the effects a collision may have had on the evolution of the cluster galaxies by tracing their star formation history. We probe current and recent activity to identify a possible star formation event at the time of the merger using EW(Hδ), EW([OII]), and Dn(4000) measured from the composite spectra of 64 cluster and 153 coeval eld galaxies. We supplement Keck DEIMOS spectra with DLS and HST imaging to determine the color, stellar mass, and morphology of each galaxy and conduct a comprehensive study of the populations in this complex structure. Spectral results indicate the average cluster and cluster red sequence galaxies experienced no enhanced star formation relative to the surrounding eld during the merger, ruling out a predominantly merger-quenched population. We nd that the average blue galaxy in the North cluster is currently active and in the South cluster is currently post-starburst having undergone a recent star formation event. While the North activity could be latent or long- term merger effects, a young blue stellar population and irregular geometry suggest the cluster was still forming prior the collision. While the South activity coincides with the time of the merger, the blue early-type population could be a result of secular cluster processes. The evidence suggests that the dearth or surfeit of activity is indiscernible from normal cluster galaxy evolution.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1430966

Report Number(s):: LLNL--JRNL-737797

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 834; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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The DEIMOS spectrograph for the Keck II Telescope: integration and testing Faber, Sandra M.; Phillips, Andrew C.; Kibrick, Robert I. Astronomical Telescopes and Instrumentation, SPIE Proceedings https://doi.org/10.1117/12.460346	conference	March 2003

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The dynamic stage of clusters and its influence on the stellar populations of galaxies Soares, N. R.; Rembold, S. B. Monthly Notices of the Royal Astronomical Society, Vol. 483, Issue 4 https://doi.org/10.1093/mnras/sty3356	journal	December 2018
Merging Cluster Collaboration: Optical and Spectroscopic Survey of a Radio-selected Sample of 29 Merging Galaxy Clusters Golovich, N.; Dawson, W. A.; Wittman, D. M. The Astrophysical Journal Supplement Series, Vol. 240, Issue 2 https://doi.org/10.3847/1538-4365/aaf88b	journal	February 2019

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