Rights statement: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated versionAndra Stroe, David Sobral, Ana Paulino-Afonso, Lara Alegre, João Calhau, Sergio Santos, Reinout van Weeren; A large Hα survey of star formation in relaxed and merging galaxy cluster environments at z ∼ 0.15–0.3. Mon Not R Astron Soc 2017; 465 (3): 2916-2935. doi: 10.1093/mnras/stw2939 is available online at: https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw2939
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - A large H$α$ survey of star formation in relaxed and merging galaxy cluster environments at $z\sim0.15-0.3$
AU - Stroe, Andra
AU - Sobral, David
AU - Afonso, Ana
AU - Alegre, Lara
AU - Calhau, João
AU - Da Graça Santos, Sergio
AU - Weeren, Reinout van
N1 - This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated versionAndra Stroe, David Sobral, Ana Paulino-Afonso, Lara Alegre, João Calhau, Sergio Santos, Reinout van Weeren; A large Hα survey of star formation in relaxed and merging galaxy cluster environments at z ∼ 0.15–0.3. Mon Not R Astron Soc 2017; 465 (3): 2916-2935. doi: 10.1093/mnras/stw2939 is available online at: https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw2939
PY - 2017/3
Y1 - 2017/3
N2 - We present the first results from the largest H$\alpha$ survey of star formation and AGN activity in galaxy clusters. Using 9 different narrow band filters, we select $>3000$ H$\alpha$ emitters within $19$ clusters and their larger scale environment over a total volume of $1.3\times10^5$ Mpc$^3$. The sample includes both relaxed and merging clusters, covering the $0.15-0.31$ redshift range and spanning from $5\times10^{14}$ $M_{\odot}$ to $30\times10^{14}$ $M_{\odot}$. We find that the H$\alpha$ luminosity function (LF) for merging clusters has a higher characteristic density $\phi^*$ compared to relaxed clusters. $\phi^*$ drops from cluster core to cluster outskirts for both merging and relaxed clusters, with the merging cluster values $\sim0.3$ dex higher at each projected radius. The characteristic luminosity $L^*$ drops over the $0.5-2.0$ Mpc distance from the cluster centre for merging clusters and increases for relaxed objects. Among disturbed objects, clusters hosting large-scale shock waves (traced by radio relics) are overdense in H$\alpha$ emitters compared to those with turbulence in their intra-cluster medium (traced by radio haloes). We speculate that the increase in star formation activity in disturbed, young, massive galaxy clusters can be triggered by interactions between gas-rich galaxies, shocks and/or the intra-cluster medium, as well as accretion of filaments and galaxy groups. Our results indicate that disturbed clusters represent vastly different environments for galaxy evolution compared to relaxed clusters or average field environments.
AB - We present the first results from the largest H$\alpha$ survey of star formation and AGN activity in galaxy clusters. Using 9 different narrow band filters, we select $>3000$ H$\alpha$ emitters within $19$ clusters and their larger scale environment over a total volume of $1.3\times10^5$ Mpc$^3$. The sample includes both relaxed and merging clusters, covering the $0.15-0.31$ redshift range and spanning from $5\times10^{14}$ $M_{\odot}$ to $30\times10^{14}$ $M_{\odot}$. We find that the H$\alpha$ luminosity function (LF) for merging clusters has a higher characteristic density $\phi^*$ compared to relaxed clusters. $\phi^*$ drops from cluster core to cluster outskirts for both merging and relaxed clusters, with the merging cluster values $\sim0.3$ dex higher at each projected radius. The characteristic luminosity $L^*$ drops over the $0.5-2.0$ Mpc distance from the cluster centre for merging clusters and increases for relaxed objects. Among disturbed objects, clusters hosting large-scale shock waves (traced by radio relics) are overdense in H$\alpha$ emitters compared to those with turbulence in their intra-cluster medium (traced by radio haloes). We speculate that the increase in star formation activity in disturbed, young, massive galaxy clusters can be triggered by interactions between gas-rich galaxies, shocks and/or the intra-cluster medium, as well as accretion of filaments and galaxy groups. Our results indicate that disturbed clusters represent vastly different environments for galaxy evolution compared to relaxed clusters or average field environments.
KW - astro-ph.GA
KW - astro-ph.CO
U2 - 10.1093/mnras/stw2939
DO - 10.1093/mnras/stw2939
M3 - Journal article
VL - 465
SP - 2916
EP - 2935
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 3
ER -