TY - JOUR
T1 - The angular momentum of disc galaxies at z = 1
AU - Marasco, A.
AU - Fraternali, F.
AU - Posti, L.
AU - Ijtsma, M.
AU - Di Teodoro, E. M.
AU - Oosterloo, T.
N1 - Publisher Copyright:
© ESO 2019.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - We investigate the relation between stellar mass (M) and specific stellar angular momentum (j), or "Fall relation", for a sample of 17 isolated, regularly rotating disc galaxies at zb ∼b1. All galaxies have rotation curves determined from Hα emission-line data; HST imaging in optical and infrared filters; and robust determinations of their stellar masses. We use HST images in f814w and f160w filters, roughly corresponding to rest-frames B and I bands, to extract surface-brightness profiles for our systems. We robustly bracket j by assuming that rotation curves beyond the outermost Hα rotation point stay either flat or follow a Keplerian fall-off. By comparing our measurements with those determined for disc galaxies in the local universe, we find no evolution in the Fall relation in the redshift range 0b< bzb< b1, regardless of the band used and despite the uncertainties in the stellar rotation curves at large radii. This result holds unless stellar masses at zb=b1 are systematically underestimated by b3 50%. Our findings are compatible with expectations based on a ΛCDM cosmological framework and support a scenario where both the stellar Tully-Fisher and mass-size relations for spirals do not evolve significantly in this redshift range.
AB - We investigate the relation between stellar mass (M) and specific stellar angular momentum (j), or "Fall relation", for a sample of 17 isolated, regularly rotating disc galaxies at zb ∼b1. All galaxies have rotation curves determined from Hα emission-line data; HST imaging in optical and infrared filters; and robust determinations of their stellar masses. We use HST images in f814w and f160w filters, roughly corresponding to rest-frames B and I bands, to extract surface-brightness profiles for our systems. We robustly bracket j by assuming that rotation curves beyond the outermost Hα rotation point stay either flat or follow a Keplerian fall-off. By comparing our measurements with those determined for disc galaxies in the local universe, we find no evolution in the Fall relation in the redshift range 0b< bzb< b1, regardless of the band used and despite the uncertainties in the stellar rotation curves at large radii. This result holds unless stellar masses at zb=b1 are systematically underestimated by b3 50%. Our findings are compatible with expectations based on a ΛCDM cosmological framework and support a scenario where both the stellar Tully-Fisher and mass-size relations for spirals do not evolve significantly in this redshift range.
KW - Galaxies: Evolution
KW - Galaxies: High-redshift
KW - Galaxies: Kinematics and dynamics
KW - Galaxies: Photometry
UR - http://www.scopus.com/inward/record.url?scp=85059822370&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/201834456
DO - 10.1051/0004-6361/201834456
M3 - Article
SN - 0004-6361
VL - 621
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - L6
ER -