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Detection of [O III] at z~3: A Galaxy above the Main Sequence, Rapidly Assembling its Stellar Mass | | Amit Vishwas
; Carl Ferkinhoff
; Thomas Nikola
; Stephen C. Parshley
; Justin P. Schoenwald
; Gordon J. Stacey
; Sarah J.U. Higdon
; James L. Higdon
; Axel Weiß
; Rolf Güsten
; Karl M. Menten
; | | Date: |
5 Mar 2018 | | Abstract: | We detect bright emission in the far infrared fine structure [O III] 88$mu$m
line from a strong lensing candidate galaxy, H-ATLAS J113526.3-014605,
hereafter G12v2.43, at z=3.127, using the $
m 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 $7.1 imes10^{9},
m(frac{10}{mu}),
m{L_{odot}},$ likely
arises from HII regions around massive stars, and the amount of Lyman continuum
photons required to support the ionization indicate the presence of
$(1.2-5.2) imes10^{6},
m(frac{10}{mu})$ equivalent O5.5 or higher stars;
where $mu$ would be the lensing magnification factor. The observed line
luminosity also requires a minimum mass of $sim 2 imes
10^{8},
m(frac{10}{mu}),
m{M_{odot}},$ in ionized gas, that is $0.33\%$
of the estimated total molecular gas mass of
$6 imes10^{10},
m(frac{10}{mu}),
m{M_{odot}},$. 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
$
m(frac{10}{mu}),
m{M_{odot}},
m{yr^{-1}}$ and already has a stellar
mass of $8 imes 10^{10},
m(frac{10}{mu}),
m{M_{odot}},$. We also
constrain the age of the current starburst to be $leqslant$ 5 million years,
making G12v2.43 a gas rich galaxy lying above the star-forming main sequence at
z$sim$3, undergoing a growth spurt and, could be on the main sequence within
the derived gas depletion timescale of $sim$66 million years. | | Source: | arXiv, 1803.1839 | | Services: | Forum | Review | PDF | Favorites | |
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