Mahalo-subaru: Mapping star formation at the peak epoch of massive galaxy formation

Tadayuki Kodama, Masao Hayashi, Yusei Koyama, Ken Ichi Tadaki, Ichi Tanaka, Rhythm Shimakawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Citations (Scopus)


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 (zâ‰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.

Original languageEnglish
Title of host publicationThe Intriguing Life of Massive Galaxies
EditorsDaniel Thomas, Anna Pasquali, Ignacio Ferreras
Number of pages4
Publication statusPublished - 2012 Aug
Externally publishedYes

Publication series

NameProceedings of the International Astronomical Union
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221


  • galaxies: clusters
  • galaxies: evolution
  • galaxies: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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