%0 Generic %1 jaffe2015budhies %A Jaffe, Yara L. %A Smith, Rory %A Candlish, Graeme N. %A Poggianti, Bianca M. %A Sheen, Yun-Kyeong %A Verheijen, Marc A. W. %D 2015 %K HI clusters observation ram-pressure simulation %T BUDHIES II: A phase-space view of HI gas stripping and star-formation quenching in cluster galaxies %U http://arxiv.org/abs/1501.03819 %X We investigate the effect of ram-pressure from the intracluster medium on the stripping of HI gas in galaxies in a massive, relaxed, X-ray bright, galaxy cluster at z=0.2 from the Blind Ultra Deep HI Environmental Survey (BUDHIES). We use cosmological simulations, and velocity vs. position phase-space diagrams to infer the orbital histories of the cluster galaxies. In particular, we embed a simple analytical description of ram-pressure stripping in the simulations to identify the regions in phase-space where galaxies are more likely to have been sufficiently stripped of their HI gas to fall below the detection limit of our survey. We find a striking agreement between the model predictions and the observed location of HI-detected and non-detected blue (late-type) galaxies in phase-space, strongly implying that ram-pressure plays a key role in the gas removal from galaxies, and that this can happen during their first infall into the cluster. However, we also find a significant number of gas-poor, red (early-type) galaxies in the infall region of the cluster that cannot easily be explained with our model of ram-pressure stripping alone. We discuss different possible additional mechanisms that could be at play, including the pre-processing of galaxies in their previous environment. Our results are strengthened by the distribution of galaxy colours (optical and UV) in phase-space, that suggests that after a (gas-rich) field galaxy falls into the cluster, it will lose its gas via ram-pressure stripping, and as it settles into the cluster, its star formation will decay until it is completely quenched. Finally, this work demonstrates the utility of phase-space diagrams to analyze the physical processes driving the evolution of cluster galaxies, in particular HI gas stripping.

@misc{jaffe2015budhies, abstract = {We investigate the effect of ram-pressure from the intracluster medium on the stripping of HI gas in galaxies in a massive, relaxed, X-ray bright, galaxy cluster at z=0.2 from the Blind Ultra Deep HI Environmental Survey (BUDHIES). We use cosmological simulations, and velocity vs. position phase-space diagrams to infer the orbital histories of the cluster galaxies. In particular, we embed a simple analytical description of ram-pressure stripping in the simulations to identify the regions in phase-space where galaxies are more likely to have been sufficiently stripped of their HI gas to fall below the detection limit of our survey. We find a striking agreement between the model predictions and the observed location of HI-detected and non-detected blue (late-type) galaxies in phase-space, strongly implying that ram-pressure plays a key role in the gas removal from galaxies, and that this can happen during their first infall into the cluster. However, we also find a significant number of gas-poor, red (early-type) galaxies in the infall region of the cluster that cannot easily be explained with our model of ram-pressure stripping alone. We discuss different possible additional mechanisms that could be at play, including the pre-processing of galaxies in their previous environment. Our results are strengthened by the distribution of galaxy colours (optical and UV) in phase-space, that suggests that after a (gas-rich) field galaxy falls into the cluster, it will lose its gas via ram-pressure stripping, and as it settles into the cluster, its star formation will decay until it is completely quenched. Finally, this work demonstrates the utility of phase-space diagrams to analyze the physical processes driving the evolution of cluster galaxies, in particular HI gas stripping.}, added-at = {2015-01-19T10:29:44.000+0100}, author = {Jaffe, Yara L. and Smith, Rory and Candlish, Graeme N. and Poggianti, Bianca M. and Sheen, Yun-Kyeong and Verheijen, Marc A. W.}, biburl = {https://www.bibsonomy.org/bibtex/2ae8bb59b08a86798bbe78f924ed27ec6/miki}, description = {[1501.03819] BUDHIES II: A phase-space view of HI gas stripping and star-formation quenching in cluster galaxies}, interhash = {9207763f1dac949330ca54fb814ca4f6}, intrahash = {ae8bb59b08a86798bbe78f924ed27ec6}, keywords = {HI clusters observation ram-pressure simulation}, note = {cite arxiv:1501.03819Comment: Accepted for publication by MNRAS; 16 pages and 10 Figures (including Appendix)}, timestamp = {2015-01-19T10:29:44.000+0100}, title = {BUDHIES II: A phase-space view of HI gas stripping and star-formation quenching in cluster galaxies}, url = {http://arxiv.org/abs/1501.03819}, year = 2015 }