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- Title
Discovery of a strong ionized-gas outflow in an AKARI-selected ultra-luminous infrared galaxy at |$z$| = 0.5.
- Authors
Chen, Xiaoyang; Akiyama, Masayuki; Noda, Hirofumi; Abdurro'uf; Toba, Yoshiki; Yamamura, Issei; Kawaguchi, Toshihiro; Kokubo, Mitsuru; Ichikawa, Kohei
- Abstract
In order to construct a sample of ultra-luminous infrared galaxies (ULIRGs; with infrared luminosity L IR > 1012 L |${_{\odot} }$|) at 0.5 < |$z$| < 1, we are conducting an optical follow-up program for bright 90 μm far-infrared sources with a faint optical (i < 20 mag) counterpart selected in the AKARI Far-Infrared Surveyor (FIS) Bright Source catalog (Ver.2). AKARI-FIS-V2 J0916248+073034, identified as a ULIRG at |$z$| = 0.49 in the spectroscopic follow-up observation, indicates signatures of an extremely strong outflow in its emission line profiles. Its [O iii] 5007 Å emission line shows a full width at half-maximum (FWHM) of 1830 km s−1 and velocity shift of −770 km s−1 relative to the stellar absorption lines. Furthermore, the low-ionization [O ii] 3726 Å 3729 Å doublet also shows a large FWHM of 910 km s−1 and velocity shift of −380 km s−1. After the removal of an unresolved nuclear component, the long-slit spectroscopy 2D image possibly shows that the outflow extends to a radius of 4 kpc. The mass outflow and energy ejection rates are estimated to be 500 M |${_{\odot} }$| yr−1 and 4 × 1044 erg s−1, respectively, which imply that the outflow is among the most powerful ones observed in ULIRGs and quasi-stellar objects at 0.3 < |$z$| < 1.6. The co-existence of the strong outflow and intense star formation (star formation rate of 990 M |${_{\odot} }$| yr−1) indicates that the feedback of the strong outflow has not severely affected the star-forming region of the galaxy.
- Subjects
SEYFERT galaxies; STAR formation; GALAXIES; LIGHT sources; BIPOLAR outflows (Astrophysics); SPECTRAL imaging; ACTIVE galaxies
- Publication
Publications of the Astronomical Society of Japan, 2019, Vol 71, Issue 2, pN.PAG
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psz002