Suppressed star formation by a merging cluster system
We examine the effects of an impending cluster merger on galaxies in the large-scale structure (LSS) RX J0910 at z =1.105. Using multiwavelength data, including 102 spectral members drawn from the Observations of Redshift Evolution in Large Scale Environments (ORELSE) survey and precise photometric redshifts, we calculate star formation rates and map the specific star formation rate density of the LSS galaxies. These analyses along with an investigation of the colour–magnitude properties of LSS galaxies indicate lower levels of star formation activity in the region between the merging clusters relative to the outskirts of the system. We suggest that gravitational tidal forces due to the potential of the merging haloes may be the physical mechanism responsible for the observed suppression of star formation in galaxies caught between the merging clusters.
Additional Information© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 March 16. Received 2017 March 16; in original form 2016 September 14. This study is based upon work supported by the NSF under Grant No. 1411943 and NASA Grant Number NNX15AK92G. This study is also based, in part, on data collected at the Subaru Telescope obtained from SMOKA, which is operated by the ADC at the NOAJ. The spectrographic data presented were obtained at the W. M. Keck Observatory, operated as a scientific partnership among the CalTech, the UC system and NASA. We thank the hard-working staff at the facilities used in this Letter and the indigenous populations for allowing us to observe on their sacred land. We also thank Nathan Golovich for discussions helpful to this Letter.
Published - Mansheim_2017pL20.pdf
Submitted - 1705.03468.pdf