Matches in SemOpenAlex for { <https://semopenalex.org/work/W4319303418> ?p ?o ?g. }
- W4319303418 endingPage "A106" @default.
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- W4319303418 abstract "We study the dynamics of cold molecular gas in two main-sequence galaxies at cosmic noon (zC-488879 at $zsimeq1.47$ and zC-400569 at $zsimeq2.24$) using new high-resolution ALMA observations of multiple $^{12}$CO transitions. For zC-400569 we also re-analyze high-quality H$alpha$ data from the SINS/zC-SINF survey. We find that (1) Both galaxies have regularly rotating CO disks and their rotation curves are flat out to $sim$8 kpc contrary to previous results pointing to outer declines in the rotation speed $V_{rm rot}$; (2) The intrinsic velocity dispersions are low ($sigma_{rm CO}lesssim15$ km/s for CO and $sigma_{rm Halpha}lesssim37$ km/s for H$alpha$) and imply $V_{rm rot}/sigma_{rm CO}gtrsim17-22$ yielding no significant pressure support; (3) Mass models using HST images display a severe disk-halo degeneracy: models with inner baryon dominance and models with cuspy dark matter halos can fit the rotation curves equally well due to the uncertainties on stellar and gas masses; (4) Milgromian dynamics (MOND) can successfully fit the rotation curves with the same acceleration scale $a_0$ measured at $zsimeq0$. The question of the amount and distribution of dark matter in high-$z$ galaxies remains unsettled due to the limited spatial extent of the available kinematic data; we discuss the suitability of various emission lines to trace extended rotation curves at high $z$. Nevertheless, the properties of these two high-$z$ galaxies (high $V_{rm rot}/sigma_{rm V}$ ratios, inner rotation curve shapes, bulge-to-total mass ratios) are remarkably similar to those of massive spirals at $zsimeq0$, suggesting weak dynamical evolution over more than 10 Gyr of the Universe's lifetime." @default.
- W4319303418 created "2023-02-07" @default.
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- W4319303418 date "2023-04-01" @default.
- W4319303418 modified "2023-10-01" @default.
- W4319303418 title "Cold gas disks in main-sequence galaxies at cosmic noon: Low turbulence, flat rotation curves, and disk-halo degeneracy" @default.
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