|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'585
Articles rated: 2609
24 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Imaging of diffuse HI absorption structure in the SSA22 proto-cluster region at z = 3.1 | | Ken Mawatari
; Akio K. Inoue
; Toru Yamada
; Tomoki Hayashino
; Takuya Otsuka
; Yuichi Matsuda
; Hideki Umehata
; Masami Ouchi
; Shiro Mukae
; | | Date: |
10 Jan 2017 | | Abstract: | Using galaxies as background light sources to map intervening Lya absorption
is a novel approach to study the interplay among galaxies, the circum-galactic
medium (CGM), and the intergalactic medium (IGM). Introducing a new measure of
z = 3.1$ HI Lya absorption relative to the cosmic mean, Delta_NB497, estimated
from photometric data of star-forming galaxies at 3.3 < z < 3.5, we have made
two-dimensional Delta_NB497 maps in the z = 3.1 SSA22 proto-cluster region and
two control fields (SXDS and GOODS-N fields) with a spatial resolution of ~ 5
comoving Mpc. The Delta_NB497 measurements in the SSA22 field are
systematically larger than those in the control fields, and this HI absorption
enhancement extends more than 50 comoving Mpc. The field-averaged (i.e., ~50
comoving Mpc scale) Delta_NB497 and the overdensity of Lya emitters (LAEs) seem
to be correlated, while there is no clear dependency of the Delta_NB497 on the
local LAE overdensity in a few comoving Mpc scale. These results suggest that
diffuse HI gas spreads out in/around the SSA22 proto-cluster. We have also
found an enhancement of Delta_NB497 at a projected distance < 100 physical kpc
from the nearest z = 3.1 galaxies at least in the SSA22 field, which is
probably due to HI gas associated with the CGM of individual galaxies. The HI
absorption enhancement in the CGM-scale tends to be weaker around galaxies with
stronger Lya emission, which suggests that the Lya escape fraction from
galaxies depends on hydrogen neutrality in the CGM. | | Source: | arXiv, 1701.2462 | | 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