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Mahalo-Subaru: Mapping Star Formation at the Peak Epoch of Massive Galaxy Formation

Published online by Cambridge University Press:  17 July 2013

Tadayuki Kodama ,
Masao Hayashi ,
Yusei Koyama ,
Ken-ichi Tadaki ,
Ichi Tanaka  and
Rhythm Shimakawa
Tadayuki Kodama
Affiliation:
Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720, USA email: [email protected] Optical and Infrared Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo 181–8588, Japan Dept. of Astronomical Science, Graduate University for Advanced Studies, Mitaka, Tokyo 181–8588, Japan
Masao Hayashi
Affiliation:
Optical and Infrared Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo 181–8588, Japan
Yusei Koyama
Affiliation:
Optical and Infrared Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo 181–8588, Japan Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
Ken-ichi Tadaki
Affiliation:
Optical and Infrared Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo 181–8588, Japan Dept. of Astronomy, Graduate School of Science, Univ. of Tokyo, Tokyo 113–0033, Japan
Ichi Tanaka
Affiliation:
Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720, USA email: [email protected]
Rhythm Shimakawa
Affiliation:
Dept. of Astronomical Science, Graduate University for Advanced Studies, Mitaka, Tokyo 181–8588, Japan
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Abstract

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MAHALO-Subaru (MApping HAlpha and Lines of Oxygen with Subaru) is our on-going large programme which aims to investigate how the star forming activities in galaxies are propagated as a function of time, mass, and environment. We are targeting 10 clusters and proto-clusters at 0.4<z<2.6, and two general fields (GOODS-N and SXDF-CANDELS) with Suprime-Cam and MOIRCS by utilizing our unique sets of narrow-band filters. The narrow-band imaging can map out star forming galaxies with the redshifted Halpha and/or [OII] emission lines from our targets, and thus providing relatively unbiased views of star forming activities across time and environment. We have almost completed narrow-band imaging of our targets, and found that star forming activity is very high even in the proto-cluster cores (z≳1.5), and that the peak of star formation is shifted outwards with time, indicating the inside-out formation of clusters. Moreover, we have identified many “red” emitters especially in high density regions at z>2, which suggests that the mode of star formation and/or the activation of AGN are dependent on environment, and thus holding the key to the environmental effects at the early stage of cluster galaxies formation and evolution.

Keywords

galaxies: clustersgalaxies: evolutiongalaxies: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S295: The intriguing life of massive galaxies , August 2012 , pp. 74 - 77
Copyright
Copyright © International Astronomical Union 2013 

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