| | |
| | |
Stat |
Members: 3643 Articles: 2'488'730 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
First Volume-Limited Search for Oxygen-Line Blobs at High Redshift: Uncovering AGN Feedback and Star-Formation Quenching | Suraphong Yuma
; Masami Ouchi
; Alyssa B. Drake
; Chris Simpson
; Kazuhiro Shimasaku
; Kimihiko Nakajima
; Yoshiaki Ono
; Rieko Momose
; Masao Mori
; Masayuki Umemura
; | Date: |
21 Jun 2013 | Abstract: | We present the first volume-limited search for extended metal-line
[OII]{lambda}{lambda}3726,3729 nebulae, or [OII] blobs, at z=1.2 using deep
narrowband imaging with a survey volume of 1.9x10^5 Mpc^3 on the 1 deg^2 sky of
Subaru-XMM Deep Survey (SXDS) field. We discover a giant [OII] blob, dubbed
’[OII] blob 1’, with a spatial extent over ~75 kpc at a spectroscopic redshift
of z=1.18, and also identify a total of thirteen [OII] blobs with a size of >30
kpc. Our optical spectrum of [OII] blob 1 presents [NeV]{lambda}3426 line at
the 6{sigma} level, indicating that this object harbors an obscured type-2
AGN. The presence of gas outflows in this object is suggested by two marginal
detections of FeII{lambda}2587 absorption and FeII*{lambda}2613 emission
lines both of which are blueshifted at as large as 500-600 km/s. The [OII]
luminosity of this object, 1.5x10^{43} erg/s, is significantly brighter than
the values expected from deduced star formation rates. These results indicate
that the heating source of [OII] blob 1 is not star formation, but AGN feedback
and associated shock excitation. The number density of [OII] blob 1-type giant
blobs is estimated to be ~5x10^{-6} Mpc^{-3} at z~1.2, which is comparable with
that of outflowing AGNs at a similar redshift, suggesting that giant [OII]
blobs are produced only by AGN activity. On the other hand, the number density
of normal [OII] blobs, 6x10^{-5} Mpc^{-3}, compared to that of z~1 galaxies in
the blue cloud in the same M_B range, may imply that 3% of star-forming
galaxies at z~1 are quenching star formation through outflows involving
extended [OII] emission. | Source: | arXiv, 1306.5246 | 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 claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |