Bibcode
Magdis, G. E.; Rigopoulou, D.; Daddi, E.; Bethermin, M.; Feruglio, C.; Sargent, M.; Dannerbauer, H.; Dickinson, M.; Elbaz, D.; Gomez Guijarro, C.; Huang, J.-S.; Toft, S.; Valentino, F.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 603, id.A93, 9 pp.
Fecha de publicación:
7
2017
Revista
Número de citas
57
Número de citas referidas
55
Descripción
We present millimetre dust emission measurements of two Lyman-break
galaxies at z 3 and construct for the first time fully sampled
infrared spectral energy distributions (SEDs), from mid-IR to the
Rayleigh-Jeans tail, of individually detected, unlensed, UV-selected,
main sequence (MS) galaxies at z = 3. The SED modelling of the two
sources confirms previous findings, based on stacked ensembles, of an
increasing mean radiation field ⟨ U ⟩ with redshift,
consistent with a rapidly decreasing gas metallicity in z> 2
galaxies. Complementing our study with CO[J = 3 → 2] emission line
observations, we have measured the molecular gas mass reservoir
(MH2) of the systems using three independent
approaches: 1) CO line observations; 2) the dust to gas mass ratio vs.
metallicity relation; and 3) a single band, dust emission flux on the
Rayleigh-Jeans side of the SED. All techniques return consistent
MH2 estimates within a factor of two or less,
yielding gas depletion time-scales (τdep ≈ 0.35 Gyr)
and gas-to-stellar mass ratios
(MH2/M∗ ≈ 0.5-1) for our z
3 massive MS galaxies. The overall properties of our galaxies are
consistent with trends and relations established at lower redshifts,
extending the apparent uniformity of star-forming galaxies over the last
11.5 billion years.
Herschel is an ESA space observatory with science instruments provided
by European-led Principal Investigator consortia and with important
participation from NASA.
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