Integral field spectroscopy of luminous infrared main-sequence galaxies at cosmic noon
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Integral field spectroscopy of luminous infrared main-sequence galaxies at cosmic noon. / Hogan, L.; Rigopoulou, D.; Magdis, G. E.; Pereira-Santaella, M.; Garcia-Bernete, I; Thatte, N.; Grisdale, K.; Huang, J. S.
I: Monthly Notices of the Royal Astronomical Society, Bind 503, Nr. 4, 02.06.2021, s. 5329-5350.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Integral field spectroscopy of luminous infrared main-sequence galaxies at cosmic noon
AU - Hogan, L.
AU - Rigopoulou, D.
AU - Magdis, G. E.
AU - Pereira-Santaella, M.
AU - Garcia-Bernete, I
AU - Thatte, N.
AU - Grisdale, K.
AU - Huang, J. S.
PY - 2021/6/2
Y1 - 2021/6/2
N2 - We present the results of an integral field spectroscopy survey of a sample of dusty (ultra) luminous infrared galaxies (U/LIRGs) at 2 < z < 2.5 using KMOS on the Very Large Telescope. The sample has been drawn from Herschel deep field surveys and benefits from ancillary multiwavelength data. Our goal is to investigate the physical characteristics, kinematics, and the drivers of star formation in the galaxies whose contribution dominates the peak of the cosmic star formation density. Two-thirds of the sample are main-sequence galaxies in contrast to the starburst nature of local U/LIRGs. Our kinematic study, unique in its focus on z similar to 2 dusty star-forming galaxies, uses the H alpha emission line to find that similar to 40 per cent appear to be isolated discs based on the ratio of rotational velocity to the velocity dispersion, suggesting steady-state mechanisms are sufficient to power the large star formation rates (SFRs). The ratio of obscured to unobscured star formation indicates the sample of galaxies experiences less dust obscuration compared to intermediate and local counterparts, while also hosting cooler dust than local U/LIRGs. In addition to H alpha we detect [N II] 6583 angstrom in our targets and show the gas-phase metallicities do not exhibit the metal deficiency of local U/LIRGs. These results indicate that, despite their extreme IR luminosity, the underlying mechanisms driving the massive SFRs found at cosmic noon are due to scaled up disc galaxies as opposed to mergers.
AB - We present the results of an integral field spectroscopy survey of a sample of dusty (ultra) luminous infrared galaxies (U/LIRGs) at 2 < z < 2.5 using KMOS on the Very Large Telescope. The sample has been drawn from Herschel deep field surveys and benefits from ancillary multiwavelength data. Our goal is to investigate the physical characteristics, kinematics, and the drivers of star formation in the galaxies whose contribution dominates the peak of the cosmic star formation density. Two-thirds of the sample are main-sequence galaxies in contrast to the starburst nature of local U/LIRGs. Our kinematic study, unique in its focus on z similar to 2 dusty star-forming galaxies, uses the H alpha emission line to find that similar to 40 per cent appear to be isolated discs based on the ratio of rotational velocity to the velocity dispersion, suggesting steady-state mechanisms are sufficient to power the large star formation rates (SFRs). The ratio of obscured to unobscured star formation indicates the sample of galaxies experiences less dust obscuration compared to intermediate and local counterparts, while also hosting cooler dust than local U/LIRGs. In addition to H alpha we detect [N II] 6583 angstrom in our targets and show the gas-phase metallicities do not exhibit the metal deficiency of local U/LIRGs. These results indicate that, despite their extreme IR luminosity, the underlying mechanisms driving the massive SFRs found at cosmic noon are due to scaled up disc galaxies as opposed to mergers.
KW - ISM: kinematics and dynamics
KW - infrared: galaxies
KW - infrared: ISM
KW - galaxies: ISM
KW - STAR-FORMING GALAXIES
KW - SPECTRAL ENERGY-DISTRIBUTIONS
KW - SIMILAR-TO 1-3
KW - MOLECULAR GAS
KW - SCALING RELATIONS
KW - MASSIVE GALAXIES
KW - SUBMILLIMETER GALAXIES
KW - INTERSTELLAR-MEDIUM
KW - ALMA OBSERVATIONS
KW - DEPLETION TIME
U2 - 10.1093/mnras/stab527
DO - 10.1093/mnras/stab527
M3 - Journal article
VL - 503
SP - 5329
EP - 5350
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 4
ER -
ID: 299501932