%0 Generic %1 hayashi2016enhanced %A Hayashi, Masao %A Kodama, Tadayuki %A Tanaka, Ichi %A Shimakawa, Rhythm %A Koyama, Yusei %A Tadaki, Ken-ichi %A Suzuki, Tomoko L. %A Yamamoto, Moegi %D 2016 %K clusters low mass sfr %T Enhanced Star Formation of Less Massive Galaxies in a Proto-Cluster at z=2.5 %U http://arxiv.org/abs/1607.04040 %X We investigate a correlation between star-formation rate (SFR) and stellar mass for Halpha emission line galaxies (HAEs) in one of the richest proto-clusters ever known at z~2.5, USS 1558-003 proto-cluster. This study is based on a 9.7-hour narrow-band imaging data with MOIRCS on the Subaru telescope. We are able to construct a sample, in combination with additional H-band data taken with WFC3 on Hubble Space Telescope (HST), of 100 HAEs reaching the dust-corrected SFRs down to 3 Msun/yr and the stellar masses down to $10^8.0$ Msun. We find that while the star-forming galaxies with >$10^9.3$ Msun are located on the universal SFR-mass main sequence irrespective of the environment, less massive star-forming galaxies with <$10^9.3$ Msun show a significant upward scatter from the main sequence in this proto-cluster. This suggests that some less massive galaxies are in a starburst phase, although we do not know yet if this is due to environmental effects.

@misc{hayashi2016enhanced, abstract = {We investigate a correlation between star-formation rate (SFR) and stellar mass for Halpha emission line galaxies (HAEs) in one of the richest proto-clusters ever known at z~2.5, USS 1558-003 proto-cluster. This study is based on a 9.7-hour narrow-band imaging data with MOIRCS on the Subaru telescope. We are able to construct a sample, in combination with additional H-band data taken with WFC3 on Hubble Space Telescope (HST), of 100 HAEs reaching the dust-corrected SFRs down to 3 Msun/yr and the stellar masses down to $10^{8.0}$ Msun. We find that while the star-forming galaxies with >$10^{9.3}$ Msun are located on the universal SFR-mass main sequence irrespective of the environment, less massive star-forming galaxies with <$10^{9.3}$ Msun show a significant upward scatter from the main sequence in this proto-cluster. This suggests that some less massive galaxies are in a starburst phase, although we do not know yet if this is due to environmental effects.}, added-at = {2016-07-15T10:25:47.000+0200}, author = {Hayashi, Masao and Kodama, Tadayuki and Tanaka, Ichi and Shimakawa, Rhythm and Koyama, Yusei and Tadaki, Ken-ichi and Suzuki, Tomoko L. and Yamamoto, Moegi}, biburl = {https://www.bibsonomy.org/bibtex/24aab310fc05207fc9d012a7d79ea8476/miki}, description = {[1607.04040] Enhanced Star Formation of Less Massive Galaxies in a Proto-Cluster at z=2.5}, interhash = {61990c19104aa2e2302c749de7501b5b}, intrahash = {4aab310fc05207fc9d012a7d79ea8476}, keywords = {clusters low mass sfr}, note = {cite arxiv:1607.04040Comment: 5 pages, 3 figures, 1 table, accepted for publication in the ApJ Letters}, timestamp = {2016-07-15T10:25:47.000+0200}, title = {Enhanced Star Formation of Less Massive Galaxies in a Proto-Cluster at z=2.5}, url = {http://arxiv.org/abs/1607.04040}, year = 2016 }