Science-advisor
REGISTER info/FAQ
Login
username
password
     
forgot password?
register here
 
Research articles
  search articles
  reviews guidelines
  reviews
  articles index
My Pages
my alerts
  my messages
  my reviews
  my favorites
 
 
Stat
Members: 3643
Articles: 2'488'730
Articles rated: 2609

29 March 2024
 
  » arxiv » 1306.5246

 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
AbstractWe 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   
 
Visitor rating: did you like this article? no 1   2   3   4   5   yes

No review found.
 Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

  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






ScienXe.org
» my Online CV
» Free


News, job offers and information for researchers and scientists:
home  |  contact  |  terms of use  |  sitemap
Copyright © 2005-2024 - Scimetrica