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Title: The rise and fall of star formation in z ~ 0.2 merging galaxy clusters

CIZA J2242.8+5301 (‘Sausage’) and 1RXS J0603.3+4213 (‘Toothbrush’) are two low-redshift (z ~ 0.2), massive (~2 × 10 15 M ), post-core passage merging clusters, which host-shock waves traced by diffuse radio emission. To study their star formation properties, we uniformly survey the ‘Sausage’ and ‘Toothbrush’ clusters in broad- and narrow-band filters and select a sample of 201 and 463 line emitters, down to a rest-frame equivalent width (13 Å). Here, we robustly separate between Hα and higher redshift emitters using a combination of optical multiband (B, g, V, r, i, z) and spectroscopic data. We build Hα luminosity functions for the entire cluster region, near the shock fronts, and away from the shock fronts and find striking differences between the two clusters. In the dynamically younger, 1 Gyr old ‘Sausage’ cluster we find numerous (59) Hα emitters above a star formation rate (SFR) of 0.17 M yr -1 surprisingly located in close proximity to the shock fronts, embedded in very hot intracluster medium plasma. The SFR density for the cluster population is at least at the level of typical galaxies at z ~ 2. Down to the same SFR, the possibly dynamically more evolved ‘Toothbrush’ cluster has only ninemore » Hα galaxies. The cluster Hα galaxies fall on the SFR–stellar mass relation z ~ 0.2 for the field. However, the ‘Sausage’ cluster has an Hα emitter density >20 times that of blank fields. If the shock passes through gas-rich cluster galaxies, the compressed gas could collapse into dense clouds and excite star formation for a few 100 Myr. Finally, this process ultimately leads to a rapid consumption of the molecular gas, accelerating the transformation of gas-rich field spirals into cluster S0s or ellipticals.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [4] ;  [5] ;  [6] ;  [1]
  1. Leiden University (the Netherlands). Leiden Observatory
  2. Leiden University (the Netherlands). Leiden Observatory ;Instituto de Astroisica e Ciencias do Espaco, Universidade de Lisboa, Observatorio Astronomico de Lisboa, Tapada da Ajuda (Portugal); Centro de Astronomia e Astrofisica da Universidade de Lisboa, Observatorio Astronomico de Lisboa, Tapada da Ajuda (Portugal)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of California, Davis, CA (United States). Department of Physics
  5. Harvard-Smithsonian Center for Astrophysics (CfA - SAO), Cambridge, MA (United States)
  6. Universitat Hamburg (Germany). Hamburger Sternwarte
Publication Date:
Report Number(s):
LLNL-JRNL-661314
Journal ID: ISSN 0035-8711
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 450; Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; shock waves; galaxies: clusters: individual: CIZA J2242.8+5301; galaxies: clusters: individual: 1RXS J0603.3+4213; galaxies: evolution; cosmology: observations; large-scale structure of Universe
OSTI Identifier:
1406454

Stroe, Andra, Sobral, David, Dawson, William, Jee, M. James, Hoekstra, Henk, Wittman, David, van Weeren, Reinout J., Brüggen, Marcus, and Röttgering, Huub J. A.. The rise and fall of star formation in z ~ 0.2 merging galaxy clusters. United States: N. p., Web. doi:10.1093/mnras/stu2519.
Stroe, Andra, Sobral, David, Dawson, William, Jee, M. James, Hoekstra, Henk, Wittman, David, van Weeren, Reinout J., Brüggen, Marcus, & Röttgering, Huub J. A.. The rise and fall of star formation in z ~ 0.2 merging galaxy clusters. United States. doi:10.1093/mnras/stu2519.
Stroe, Andra, Sobral, David, Dawson, William, Jee, M. James, Hoekstra, Henk, Wittman, David, van Weeren, Reinout J., Brüggen, Marcus, and Röttgering, Huub J. A.. 2015. "The rise and fall of star formation in z ~ 0.2 merging galaxy clusters". United States. doi:10.1093/mnras/stu2519. https://www.osti.gov/servlets/purl/1406454.
@article{osti_1406454,
title = {The rise and fall of star formation in z ~ 0.2 merging galaxy clusters},
author = {Stroe, Andra and Sobral, David and Dawson, William and Jee, M. James and Hoekstra, Henk and Wittman, David and van Weeren, Reinout J. and Brüggen, Marcus and Röttgering, Huub J. A.},
abstractNote = {CIZA J2242.8+5301 (‘Sausage’) and 1RXS J0603.3+4213 (‘Toothbrush’) are two low-redshift (z ~ 0.2), massive (~2 × 1015 M⊙), post-core passage merging clusters, which host-shock waves traced by diffuse radio emission. To study their star formation properties, we uniformly survey the ‘Sausage’ and ‘Toothbrush’ clusters in broad- and narrow-band filters and select a sample of 201 and 463 line emitters, down to a rest-frame equivalent width (13 Å). Here, we robustly separate between Hα and higher redshift emitters using a combination of optical multiband (B, g, V, r, i, z) and spectroscopic data. We build Hα luminosity functions for the entire cluster region, near the shock fronts, and away from the shock fronts and find striking differences between the two clusters. In the dynamically younger, 1 Gyr old ‘Sausage’ cluster we find numerous (59) Hα emitters above a star formation rate (SFR) of 0.17 M⊙ yr-1 surprisingly located in close proximity to the shock fronts, embedded in very hot intracluster medium plasma. The SFR density for the cluster population is at least at the level of typical galaxies at z ~ 2. Down to the same SFR, the possibly dynamically more evolved ‘Toothbrush’ cluster has only nine Hα galaxies. The cluster Hα galaxies fall on the SFR–stellar mass relation z ~ 0.2 for the field. However, the ‘Sausage’ cluster has an Hα emitter density >20 times that of blank fields. If the shock passes through gas-rich cluster galaxies, the compressed gas could collapse into dense clouds and excite star formation for a few 100 Myr. Finally, this process ultimately leads to a rapid consumption of the molecular gas, accelerating the transformation of gas-rich field spirals into cluster S0s or ellipticals.},
doi = {10.1093/mnras/stu2519},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 450,
place = {United States},
year = {2015},
month = {4}
}