TY - JOUR
T1 - A shallow slope for the stellar mass-angular momentum relation of star-forming galaxies at 1.5 < z < 2.5
AU - Salcedo, Juan M. Espejo
AU - Glazebrook, Karl
AU - Fisher, Deanne B.
AU - Sweet, Sarah M.
AU - Obreschkow, Danail
AU - Schreiber, N. M. Foerster
PY - 2025/1
Y1 - 2025/1
N2 - We present measurements of the specific angular momentum j(star) of 41 star-forming galaxies at 1.5 < z < 2.5. These measurements are based on radial profiles inferred from near-infrared Hubble Space Telescope photometry, along with multiresolution emission-line kinematic modelling using integral field spectroscopy (IFS) data from K-band multi-object spectrograph, Spectrograph for Integral Field Observations in the Near Infrared, and OH-Suppressing Infra-Red Imaging Spectrograph. We identified 24 discs (disc fraction of 58.6 +/- 7.7 per cent) and used them to parametrize the j(star) versus stellar mass M-star relation (Fall relation) as j(star) proportional to M-star(beta). We measure a power-law slope beta=0.25 +/- 0.15, which deviates by approximately 3 sigma from the commonly adopted local value beta=0.67, indicating a statistically significant difference. We find that two key systematic effects could drive the steep slopes in previous high-redshift studies: first, including irregular (non-disc) systems due to limitations in spatial resolution and second, using the commonly used approximation (j) over tilde (star) approximate to k(n)v(s)r(eff), which depends on global unresolved quantities. In our sample, both effects lead to steeper slopes of beta=0.48 +/- 0.21 and 0.61 +/- 0.21, respectively. To understand the shallow slope, we discuss observational effects and systematic uncertainties and analyse the retention of j(star) relative to the angular momentum of the halo j(h) (angular momentum retention factor f(j) = j(star)/j(h)). For the M-star range covered by the sample 9.5 < log(10) (M-star/M-circle dot) < 11.5 (halo mass 11.5 < log(10) (M-h/M-circle dot) < 14), we find large f(j) values (>1 in some cases) in low-mass haloes that decrease with increasing mass, suggesting a significant role of efficient angular momentum transport in these gas-rich systems, aided by the removal of low-j(star) gas via feedback-driven outflows in low-mass galaxies.
AB - We present measurements of the specific angular momentum j(star) of 41 star-forming galaxies at 1.5 < z < 2.5. These measurements are based on radial profiles inferred from near-infrared Hubble Space Telescope photometry, along with multiresolution emission-line kinematic modelling using integral field spectroscopy (IFS) data from K-band multi-object spectrograph, Spectrograph for Integral Field Observations in the Near Infrared, and OH-Suppressing Infra-Red Imaging Spectrograph. We identified 24 discs (disc fraction of 58.6 +/- 7.7 per cent) and used them to parametrize the j(star) versus stellar mass M-star relation (Fall relation) as j(star) proportional to M-star(beta). We measure a power-law slope beta=0.25 +/- 0.15, which deviates by approximately 3 sigma from the commonly adopted local value beta=0.67, indicating a statistically significant difference. We find that two key systematic effects could drive the steep slopes in previous high-redshift studies: first, including irregular (non-disc) systems due to limitations in spatial resolution and second, using the commonly used approximation (j) over tilde (star) approximate to k(n)v(s)r(eff), which depends on global unresolved quantities. In our sample, both effects lead to steeper slopes of beta=0.48 +/- 0.21 and 0.61 +/- 0.21, respectively. To understand the shallow slope, we discuss observational effects and systematic uncertainties and analyse the retention of j(star) relative to the angular momentum of the halo j(h) (angular momentum retention factor f(j) = j(star)/j(h)). For the M-star range covered by the sample 9.5 < log(10) (M-star/M-circle dot) < 11.5 (halo mass 11.5 < log(10) (M-h/M-circle dot) < 14), we find large f(j) values (>1 in some cases) in low-mass haloes that decrease with increasing mass, suggesting a significant role of efficient angular momentum transport in these gas-rich systems, aided by the removal of low-j(star) gas via feedback-driven outflows in low-mass galaxies.
KW - Galaxies: disc
KW - Galaxies: evolution
KW - Galaxies: high-redshift
KW - Galaxies: kinematics and dynamics
UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=uwapure5-25&SrcAuth=WosAPI&KeyUT=WOS:001376680200001&DestLinkType=FullRecord&DestApp=WOS_CPL
U2 - 10.1093/mnras/stae2647
DO - 10.1093/mnras/stae2647
M3 - Article
SN - 0035-8711
VL - 536
SP - 1188
EP - 1216
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -