The optical, mechanical, and thermal design and performance of the 2&lt;sup&gt;nd&lt;/sup&gt; generation redshift (z) and early universe spectrometer, ZEUS-2

We detect bright emission in the far infrared fine structure [O iii] 88 µm line from a strong lensing candidate galaxy, H-ATLAS J113526.3-014605, hereafter G12v2.43 , at z = 3.127, using the 2 nd generation Redshift (z) and Early Universe Spectrometer (ZEUS-2) at the Atacama Pathfinder Experiment Telescope (APEX). This is only the fifth detection of this far-IR line from a sub-millimeter galaxy at the epoch of galaxy assembly. The observed [O iii] luminosity of 7.1 × 10 9 ( 10 µ ) L likely arises from Hii regions around massive stars, and the amount of Lyman continuum photons required to support the ionization indicate the presence of (1.2 − 5.2) × 10 6 ( 10 µ ) equivalent O5.5 or higher stars; where µ would be the lensing magnification factor. The observed line luminosity also requires a minimum mass of ∼ 2 × 10 8 ( 10 µ ) M in ionized gas, that is 0.33% of the estimated total molecular gas mass of 6 × 10 10 ( 10 µ ) M . We compile multi-band photometry tracing rest-frame UV to millimeter continuum emission to further constrain the properties of this dusty high redshift star-forming galaxy. Via SED modeling we find G12v2.43 is forming stars at a rate of 916 ( 10 µ ) M yr −1 and already has a stellar mass of 8 × 10 10 ( 10 µ ) M . We also constrain the age of the current starburst to be 5 million years, making G12v2.43 a gas rich galaxy lying above the star-forming main sequence at z∼3, undergoing a growth spurt and, could be on the main sequence within the derived gas depletion timescale of ∼66 million years.

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Detection of [O iii] at z ∼ 3: A Galaxy Above the Main Sequence, Rapidly Assembling Its Stellar Mass

Vishwas

Ferkinhoff

Nikola

et al. 2018

ApJ

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The optical, mechanical, and thermal design and performance of the 2<sup>nd</sup> generation redshift (z) and early universe spectrometer, ZEUS-2

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Detection of [O iii] at z ∼ 3: A Galaxy Above the Main Sequence, Rapidly Assembling Its Stellar Mass

Detection of [O iii] at z ∼ 3: A Galaxy Above the Main Sequence, Rapidly Assembling Its Stellar Mass

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