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MOSFIRE and LDSS3 Spectroscopy for an [OII] Blob at z=1.18: Gas Outflow and Energy Source by Harikane, Yuichi; Ouchi, Masami; Yuma, Suraphong; Rauch, Michael; Nakajima, Kimihiko; Ono, Yoshiaki is a scholarly article available to read on EtoBox.

What is MOSFIRE and LDSS3 Spectroscopy for an [OII] Blob at z=1.18: Gas Outflow and Energy Source about?

We report our Keck/MOSFIRE and Magellan/LDSS3 spectroscopy for an [OII] Blob, OIIB10, that is a high-$z$ galaxy with spatially extended [OII]$\lambda\lambda3726,3729$ emission over 30 kpc recently identified by a Subaru large-area narrowband survey. The systemic redshift of OIIB10 is $z=1.18$ securely determined with [OIII]$\lambda\lambda4959,5007$ and H$\beta$ emission lines. We identify FeII$\lambda$2587 and MgII$\lambda\lambda$2796,2804 absorption lines blueshifted from the systemic redshift by $80\pm50$ and $260\pm40$ km s$^{-1}$, respectively, which indicate gas outflow from OIIB10 with the velocity of $\sim 80-260$ km s$^{-1}$. This outflow velocity is comparable with the escape velocity, $250\pm140$ km s$^{-1}$, estimated under the assumption of a singular isothermal halo potential profile. Some fraction of the outflowing gas could escape from the halo of OIIB10, suppressing OIIB10's star-formation activity. We estimate a mass loading factor, $\eta$, that is a ratio of mass outflow rate to star-formation rate, and obtain $\eta>0.8\pm 0.1$ which is relatively high compared with low-$z$ starbursts including U/LIRGs and AGNs. The major energy source of the outflow is unclear wi

Author

Harikane, Yuichi; Ouchi, Masami; Yuma, Suraphong; Rauch, Michael; Nakajima, Kimihiko; Ono, Yoshiaki

Published

2014

Language

EN