Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 391, Issue 4, Pages 1758-1770Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2008.13931.x
Keywords
galaxies: clusters: individual: RXJ1716.4+6708; galaxies: evolution; galaxies: starburst; large-scale structure of Universe
Categories
Funding
- Japanese Ministry of Education, Culture, Sports and Science [15740126, 18684004]
- Japan Society for the Promotion of Science (JSPS)
- MOST/KOSEF [R16-2008-015-01000-0]
- KASI
- Grants-in-Aid for Scientific Research [15740126, 18684004] Funding Source: KAKEN
- National Research Foundation of Korea [R16-2008-015-01001-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
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-mu m-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-mu m-detected galaxies over similar to 200 arcmin(2) around the cluster reveals that few 15-mu m 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-mu m-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-mu m-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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available