SIMBAD references

2008MNRAS.391.1758K - Mon. Not. R. Astron. Soc., 391, 1758-1770 (2008/December-3)

Mapping dusty star formation in and around a cluster at z = 0.81 by wide-field imaging with AKARI.

KOYAMA Y., KODAMA T., SHIMASAKU K., OKAMURA S., TANAKA M., LEE H.M., IM M., MATSUHARA H., TAKAGI T., WADA T. and OYABU S.

Abstract (from CDS):

We present environmental dependence of dusty star-forming activity in and around the cluster RXJ1716.4+6708 at z = 0.81 based on wide-field and multiwavelength observations with the Prime Focus Camera on the Subaru Telescope (Suprime-Cam) and the Infrared Camera onboard the AKARI satellite. Our optical data show that the optical colour distribution of galaxies starts to dramatically change from blue to red at the medium-density environment such as cluster outskirts, groups and filaments. By combining with the AKARI infrared data, we find that 15-µm-detected galaxies tend to have optical colours between the red sequence and the blue cloud with a tail into the red sequence, consistent with being dusty star-forming galaxies.

The spatial distribution of the 15-µm-detected galaxies over ∼200 arcmin2 around the cluster reveals that few 15-µm galaxies are detected in the cluster central region. This is probably due to the low star-forming activity in the cluster core. However, interestingly, the fraction of 15-µm-detected galaxies in the medium-density environments is as high as in the low-density field, despite the fact that the optical colours start to change in the medium-density environments. Furthermore, we find that 15-µm-detected galaxies which have optically red colours (candidates for dusty red galaxies) and galaxies with high specific star formation rates are also concentrated in the medium-density environment. These results imply that the star-forming activity in galaxies in groups and filaments is enhanced due to some environmental effects specific to the medium-density environment (e.g. galaxy-galaxy interaction), and such a phenomenon is probably directly connected to the truncation of star-forming activity in galaxies seen as the dramatic change in optical colours in such environment.


Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): galaxies: clusters: individual: RXJ1716.4+6708 - galaxies: evolution - galaxies: starburst - large-scale structure of Universe

Status at CDS:  

Simbad objects: 13

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2020.03.31-19:31:22

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