CAAUL Seminar - The environmental impacts on the star formation main sequence out to z~2 - 24 fevereiro 2014

Yusei Koyama

National Astronomical Observatory of Japan [NAOJ], Tokyo, Japan

Abstract / Resumo

Recent observations have shown that there is a tight correlation between star formation rate (SFR) and stellar mass (M*) of star-forming galaxies. This SFR-M* relation (so-called "star formation main sequence") is reported to be independent of environment at least in the local universe. In my talk, I will present our recent effort to investigate the environmental dependence of the SF main sequence out to z~2. By compiling our large, H-alpha selected SF galaxy samples in distant clusters (from MAHALO-Subaru; our ongoing project) and in general field environments (from HiZELS), we find that there is no detectable environmental variation in the SF main sequence out to z~2, as far as we rely on the simple H-alpha based SFRs. However, in contrast to this apparently simple picture, we also find an interesting hint that SF galaxies in cluster environments tend to be more massive, and perhaps more highly obscured by dust. We speculate that such massive/dusty galaxies surviving in distant cluster environments should hold a key for understanding environmental effects in the early universe.

24 de fevereiro de 2014 | 15:30

Local

OAL - Observatório Astronómico de Lisboa

Seminar room at 15:30 with coffee, tea and biscuits from 15:15