Evaluating galaxy dynamical masses from kinematics and jeans equilibrium in simulations

@article{Kretschmer2020EvaluatingGD,
  title={Evaluating galaxy dynamical masses from kinematics and jeans equilibrium in simulations},
  author={Michael Kretschmer and Avishai Dekel and Jonathan Freundlich and Sharon Lapiner and Daniel Ceverino and Joel R. Primack},
  journal={arXiv: Astrophysics of Galaxies},
  year={2020}
}
We provide prescriptions to evaluate the dynamical mass ($M_{\rm dyn}$) of galaxies from kinematic measurements of stars or gas using analytic considerations and the VELA suite of cosmological zoom-in simulations at $z=1-5$. We find that Jeans or hydrostatic equilibrium is approximately valid for galaxies of stellar masses above $M_\star \!\sim\! 10^{9.5}M_\odot$ out to $5$ effective radii ($R_e$). When both measurements of the rotation velocity $v_\phi$ and of the radial velocity dispersion… 

Dark Matter Fraction in z~1 Star-Forming Galaxies

Context. The study of dark matter (DM) across cosmic timescales is essential for understanding galaxy formation and evolution. Recent observational studies show that further back in time (z > 0.5),…

LEGA-C: Analysis of Dynamical Masses from Ionized Gas and Stellar Kinematics at z ∼ 0.8

We compare dynamical mass estimates based on spatially extended stellar and ionized gas kinematics (M dyn,* and M dyn,eml, respectively) of 157 star-forming galaxies at 0.6 ≀ z < 1. Compared with z βˆΌβ€¦

Starbursts with suppressed velocity dispersion revealed in a forming cluster at z = 2.51

One of the most prominent features of galaxy clusters is the presence of a dominant population of massive ellipticals in their cores. Stellar archaeology suggests that these gigantic beasts…

Rotation Curves of Galaxies and Their Dependence on Morphology and Stellar Mass

We study how stellar rotation curves (RCs) of galaxies are correlated on average with morphology and stellar mass (M star) using the final release of Sloan Digital Sky Survey IV MaNGA data. We use…

References

SHOWING 1-10 OF 87 REFERENCES

The discrepancy between dynamical and stellar masses in massive compact galaxies traces non-homology

For many massive compact galaxies, their dynamical masses ($M_\mathrm{dyn} \propto \sigma^2 r_\mathrm{e}$) are lower than their stellar masses ($M_\star$). We analyse the unphysical mass discrepancy…

Evolution of density profiles in high-z galaxies: compaction and quenching inside-out

Using cosmological simulations, we address the interplay between structure and star formation in high-redshift galaxies via the evolution of surface density profiles. Our sample consists of 26…

Rapid filamentary accretion as the origin of extended thin discs

Galactic outflows driven by stellar feedback are crucial for explaining the inefficiency of star formation in galaxies. Although strong feedback can promote the formation of galactic discs by…

Four phases of angular-momentum buildup in high-z galaxies: from cosmic-web streams through an extended ring to disc and bulge

We study the angular-momentum (AM) buildup in high-$z$ massive galaxies using high-resolution cosmological simulations. The AM originates in co-planar streams of cold gas and merging galaxies tracing…

Origin of star-forming rings around massive centres in massive galaxies at z < 4

Using analytic modelling and simulations, we address the origin of an abundance of star-forming clumpy extended gas rings about massive central bodies in massive galaxies at z < 4. Rings form by…

Measuring dynamical masses from gas kinematics in simulated high-redshift galaxies

Advances in instrumentation have recently extended detailed measurements of gas kinematics to large samples of high-redshift galaxies. Relative to most nearby, thin disc galaxies, in which gas…

Formation of elongated galaxies with low masses at high redshift

We report the identification of elongated (triaxial or prolate) galaxies in cosmological simulations at $z\simeq2$. These are preferentially low-mass galaxies ($M_s \le 10^{9.5} \ M_\odot$), residing…

The Stellar, Gas, and Dynamical Masses of Star-forming Galaxies at z ~ 2

We present analysis of the near-infrared spectra of 114 rest-frame UV-selected star-forming galaxies at z ~ 2. By combining the HΞ± spectra with photometric measurements from observed 0.3-8 ΞΌm, we…

Evolution of galaxy shapes from prolate to oblate through compaction events

We study the evolution of global shapes of galaxies using cosmological simulations. The shapes refer to the components of dark matter (DM), stars and gas at the stellar half-mass radius. Most…

The confinement of star-forming galaxies into a main sequence through episodes of gas compaction, depletion and replenishment

Using cosmological simulations, we address the properties of high-redshift star-forming galaxies (SFGs) across their main sequence (MS) in the plane of star-formation rate (SFR) versus stellar mass.…
...