Dynamical properties of z similar to 4.5 dusty star-forming galaxies and their connection with local early-type galaxies
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Dynamical properties of z similar to 4.5 dusty star-forming galaxies and their connection with local early-type galaxies. / Rizzo, Francesca; Vegetti, Simona; Fraternali, Filippo; Stacey, Hannah R.; Powell, Devon.
I: Monthly Notices of the Royal Astronomical Society, Bind 507, Nr. 3, 11.09.2021, s. 3952-3984.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Dynamical properties of z similar to 4.5 dusty star-forming galaxies and their connection with local early-type galaxies
AU - Rizzo, Francesca
AU - Vegetti, Simona
AU - Fraternali, Filippo
AU - Stacey, Hannah R.
AU - Powell, Devon
PY - 2021/9/11
Y1 - 2021/9/11
N2 - There is a large consensus that gas in high-z galaxies is highly turbulent, because of a combination of stellar feedback processes and gravitational instabilities driven by mergers and gas accretion. In this paper, we present the analysis of a sample of five Dusty Star Forming Galaxies (DSFGs) at 4 less than or similar to z less than or similar to 5. Taking advantage of the magnifying power of strong gravitational lensing, we quantified their kinematic and dynamical properties from ALMA observations of their [C II] emission line. We combined the dynamical measurements obtained for these galaxies with those obtained from previous studies to build the largest sample of z similar to 4.5 galaxies with high-quality data and sub-kpc spatial resolutions, so far. We found that all galaxies in the sample are dynamically cold, with rotation-to-random motion ratios, V/sigma, between 7 and 15. The relation between their velocity dispersions and their star formation rates indicates that stellar feedback is sufficient to sustain the turbulence within these galaxies and no further mechanisms are needed. In addition, we performed a rotation curve decomposition to infer the relative contribution of the baryonic (gas, stars) and dark matter components to the total gravitational potentials. This analysis allowed us to compare the structural properties of the studied DSFGs with those of their descendants, the local early type galaxies. In particular, we found that five out of six galaxies of the sample show the dynamical signature of a bulge, indicating that the spheroidal component is already in place at z similar to 4.5.
AB - There is a large consensus that gas in high-z galaxies is highly turbulent, because of a combination of stellar feedback processes and gravitational instabilities driven by mergers and gas accretion. In this paper, we present the analysis of a sample of five Dusty Star Forming Galaxies (DSFGs) at 4 less than or similar to z less than or similar to 5. Taking advantage of the magnifying power of strong gravitational lensing, we quantified their kinematic and dynamical properties from ALMA observations of their [C II] emission line. We combined the dynamical measurements obtained for these galaxies with those obtained from previous studies to build the largest sample of z similar to 4.5 galaxies with high-quality data and sub-kpc spatial resolutions, so far. We found that all galaxies in the sample are dynamically cold, with rotation-to-random motion ratios, V/sigma, between 7 and 15. The relation between their velocity dispersions and their star formation rates indicates that stellar feedback is sufficient to sustain the turbulence within these galaxies and no further mechanisms are needed. In addition, we performed a rotation curve decomposition to infer the relative contribution of the baryonic (gas, stars) and dark matter components to the total gravitational potentials. This analysis allowed us to compare the structural properties of the studied DSFGs with those of their descendants, the local early type galaxies. In particular, we found that five out of six galaxies of the sample show the dynamical signature of a bulge, indicating that the spheroidal component is already in place at z similar to 4.5.
KW - gravitational lensing: strong
KW - galaxies: evolution
KW - galaxies: high-redshift
KW - galaxies: ISM
KW - galaxies: kinematics and dynamics
KW - submillimetre: galaxies
KW - SPECTROSCOPIC SURVEY KROSS
KW - COLD GAS ACCRETION
KW - SIMILAR-TO 1-2
KW - DARK-MATTER
KW - ATLAS(3D) PROJECT
KW - MOLECULAR GAS
KW - SUBMILLIMETER GALAXIES
KW - VELOCITY DISPERSION
KW - ELLIPTIC GALAXIES
KW - STELLAR FEEDBACK
U2 - 10.1093/mnras/stab2295
DO - 10.1093/mnras/stab2295
M3 - Journal article
VL - 507
SP - 3952
EP - 3984
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 3
ER -
ID: 284091027