English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

The MOSDEF Survey: Kinematic and structural evolution of star-forming galaxies at 1.4 ≤ z ≤ 3.8

MPS-Authors
/persons/resource/persons216308

Price,  Sedona H.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons128736

Übler,  Hannah
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4923

Förster Schreiber,  Natascha M.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Price, S. H., Kriek, M., Barro, G., Shapley, A. E., Reddy, N. A., Freeman, W. R., et al. (2020). The MOSDEF Survey: Kinematic and structural evolution of star-forming galaxies at 1.4 ≤ z ≤ 3.8. The Astrophysical Journal, 894(2): 91. doi:10.3847/1538-4357/ab7990.


Cite as: http://hdl.handle.net/21.11116/0000-0006-A216-A
Abstract
We present ionized gas kinematics for 681 galaxies at z∼1.4−3.8 from the MOSFIRE Deep Evolution Field survey, measured using models which account for random galaxy-slit misalignments together with structural parameters derived from CANDELS Hubble Space Telescope (HST) imaging. Kinematics and sizes are used to derive dynamical masses. Baryonic masses are estimated from stellar masses and inferred gas masses from dust-corrected star formation rates (SFRs) and the Kennicutt-Schmidt relation. We measure resolved rotation for 105 galaxies. For the remaining 576 galaxies we use models based on HST imaging structural parameters together with integrated velocity dispersions and baryonic masses to statistically constrain the median ratio of intrinsic ordered to disordered motion, V/σV,0 . We find that V/σV,0 increases with increasing stellar mass and decreasing specific SFR (sSFR). These trends may reflect marginal disk stability, where systems with higher gas fractions have thicker disks. For galaxies with detected rotation we assess trends between their kinematics and mass, sSFR, and baryon surface density (Σbar,e). Intrinsic dispersion correlates most with Σbar,e and velocity correlates most with mass. By comparing dynamical and baryonic masses, we find that galaxies at z∼1.4−3.8 are baryon dominated within their effective radii (RE), with Mdyn/Mbaryon increasing over time. The inferred baryon fractions within RE, fbar, decrease over time, even at fixed mass, size, or surface density. At fixed redshift, fbar does not appear to vary with stellar mass but increases with decreasing RE and increasing Σbar,e. For galaxies at z≥2, the median inferred baryon fractions generally exceed 100%. We discuss possible explanations and future avenues to resolve this tension.