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• W3105669237 abstract "We present the first spectroscopic measurement of multiple rest-frame optical emission lines at $z>4$. During the MOSFIRE Deep Evolution Field (MOSDEF) survey, we observed the galaxy GOODSN-17940 with the Keck I/MOSFIRE spectrograph. The K-band spectrum of GOODSN-17940 includes significant detections of the [OII]$lambdalambda 3726,3729$, [NeIII]$lambda3869$, and H$gamma$ emission lines and a tentative detection of H$delta$, indicating $z_{rm{spec}}=4.4121$. GOODSN-17940 is an actively star-forming $z>4$ galaxy based on its K-band spectrum and broadband spectral energy distribution. A significant excess relative to the surrounding continuum is present in the Spitzer/IRAC channel 1 photometry of GOODSN-17940, due primarily to strong H$alpha$ emission with a rest-frame equivalent width of $mbox{EW(H}alpha)=1200$ AA. Based on the assumption of $0.5 Z_{odot}$ models and the Calzetti attenuation curve, GOODSN-17940 is characterized by $M_*=5.0^{+4.3}_{-0.2}times 10^9 M_{odot}$. The Balmer decrement inferred from H$alpha$/H$gamma$ is used to dust correct the H$alpha$ emission, yielding $mbox{SFR(H}alpha)=320^{+190}_{-140} M_{odot}mbox{ yr}^{-1}$. These $M_*$ and SFR values place GOODSN-17940 an order of magnitude in SFR above the $zsim 4$ star-forming main sequence. Finally, we use the observed ratio of [NeIII]/[OII] to estimate the nebular oxygen abundance in GOODSN-17940, finding $mbox{O/H}sim 0.2 mbox{ (O/H)}_{odot}$. Combining our new [NeIII]/[OII] measurement with those from stacked spectra at $zsim 0, 2, mbox{ and } 3$, we show that GOODSN-17940 represents an extension to $z>4$ of the evolution towards higher [NeIII]/[OII] (i.e., lower $mbox{O/H}$) at fixed stellar mass. It will be possible to perform the measurements presented here out to $zsim 10$ using the James Webb Space Telescope." @default.
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• W3105669237 date "2017-09-08" @default.
• W3105669237 modified "2023-10-02" @default.
• W3105669237 title "The MOSDEF Survey: First Measurement of Nebular Oxygen Abundance at <i>z</i> > 4" @default.
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• W3105669237 doi "https://doi.org/10.3847/2041-8213/aa8815" @default.
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