First systematic 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, Masayuki Akiyama, Masao Mori, Masayuki Umemura

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13 Citations (Scopus)

Abstract

We present the first systematic search for extended metal-line [O II] λλ3726, 3729 nebulae, or [O II] blobs (O IIBs), at z = 1.2 using deep narrowband imaging with a survey volume of 1.9 × 105 Mpc3 on the 0.62 deg2 sky of Subaru-XMM Deep Survey (SXDS) field. We discover a giant O IIB, called "O IIB 1," with a spatial extent over ∼75 kpc at a spectroscopic redshift of z = 1.18, and also identify a total of 12 O IIBs with a size of >30 kpc. Our optical spectrum of O IIB 1 presents [Ne V] λ3426 line at the 6σ level, indicating that this object harbors an obscured type-2 active galactic nucleus (AGN). The presence of gas outflows in this object is suggested by two marginal detections of Fe II λ2587 absorption and Fe II* λ2613 emission lines both of which are blueshifted at as large as 500-600 km s-1, indicating that the heating source of O IIB 1 is AGN or associated shock excitation rather than supernovae produced by starbursts. The number density of O IIB 1-type giant blobs is estimated to be ∼5 × 10-6 Mpc-3 at z ∼ 1.2, which is comparable with that of AGNs driving outflow at a similar redshift, suggesting that giant O IIBs are produced only by AGN activity. On the other hand, the number density of small O IIBs, 6 × 10-5 Mpc-3, compared to that of z ∼ 1 galaxies in the blue cloud in the same MB range, may imply that 3% of star-forming galaxies at z ∼ 1 are quenching star formation through outflows involving extended [O II] emission.

Original languageEnglish
Article number53
JournalAstrophysical Journal
Volume779
Issue number1
DOIs
Publication statusPublished - 2013 Dec 10

Keywords

  • galaxies: high-redshift
  • galaxy: evolution

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Yuma, S., Ouchi, M., Drake, A. B., Simpson, C., Shimasaku, K., Nakajima, K., Ono, Y., Momose, R., Akiyama, M., Mori, M., & Umemura, M. (2013). First systematic search for oxygen-line blobs at high redshift: Uncovering agn feedback and star formation quenching. Astrophysical Journal, 779(1), [53]. https://doi.org/10.1088/0004-637X/779/1/53