|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Panoramic H-alpha and mid-infrared mapping of star formation in a z=0.8 cluster | | Yusei Koyama
; Tadayuki Kodama
; Kazuhiro Shimasaku
; Masao Hayashi
; Sadanori Okamura
; Ichi Tanaka
; Chihiro Tokoku
; | | Date: |
15 Dec 2009 | | Abstract: | We present the first wide-field H-alpha imaging survey around the distant
cluster RXJ1716.4+6708 at z=0.81 with a narrow-band filter on MOIRCS/Subaru,
down to SFR(Ha)~1Msun/yr. Combining with a wide-field MIR imaging survey with
AKARI, we compare the unobscured and obscured star formation activities in the
cluster. We find that both H-alpha emitters and MIR galaxies avoid the cluster
centre and their spatial distribution is quite similar. Most of the H-alpha
emitters show blue colours, but we find some H-alpha emitters on the red
sequence. The MIR galaxies tend to be systematically redder than the H-alpha
emitters probably due to heavy dust extinction. Interestingly, the red H-alpha
emitters and the red MIR galaxies (i.e. dusty red galaxies) are most commonly
seen in the medium-density environment such as cluster outskirts, groups and
filaments, where optical colours of galaxies change. We also find that A(Ha)
exceeds ~3 in extreme cases and that such very dusty galaxies are also located
in the medium-density environment. These findings suggest that dusty star
formation is triggered in the in-fall region of the cluster, implying a
probable link between galaxy transition and dusty star formation. We finally
calculate the cluster total SFR and find that the cluster total SFR based on
H-alpha alone can be underestimated more than factor ~2 even after 1 mag
extinction correction. We suggest that the mass-normalized cluster SFR rapidly
declines since z~1 following ~(1+z)^6, although the uncertainty is still large. | | Source: | arXiv, 0912.2786 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER