2 research outputs found
MaNGA galaxy properties -- II. A detailed comparison of observed and simulated spiral galaxy scaling relations
We present a catalogue of dynamical properties for 2368 late-type galaxies
from the MaNGA survey. The latter complements the catalogue of photometric
properties for the same sample based on deep optical DESI photometry processed
with AutoProf. Rotation curves (RCs), extracted by model fitting H
velocity maps from the MaNGA Data Analysis Pipeline, extend out to 1.4 (1.9)
R for the primary (secondary) MaNGA samples. The RCs and ancillary MaNGA
Pipe3D data products were used to construct various fundamental galaxy scaling
relations that are also compared uniformly with similar relations from NIHAO
zoom-in simulations. Simulated NIHAO galaxies were found to broadly reproduce
the observed MaNGA galaxy population for .
Some discrepancies remain, such as those pertaining to central stellar
densities and the diversity of RCs due to strong feedback schemes. Also
presented are spatially-resolved scatters for the velocity-size-stellar mass
(VRM) structural relations using MaNGA and NIHAO samples. The scatter for
these relations in the galaxian interiors is a consequence of the diversity of
inner RC shapes, while scatter in the outskirts is dictated by the large range
of stellar surface densities which itself is driven by sporadic star formation.
The detailed spatially-resolved scatter analysis highlights the complex
interplay between local and global astrophysical processes and provides a
strong constraint to numerical simulations.Comment: 21 pages, 13 Figures, Accepted for publication in MNRA
NIHAO-LG: the uniqueness of Local Group dwarf galaxies
International audienceRecent observational and theoretical studies of the Local Group (LG) dwarf galaxies have highlighted their unique star-formation history, stellar metallicity, gas content, and kinematics. We investigate the commonality of these features by comparing constrained LG and field central dwarf halo simulations in the Numerical Investigation of a Hundred Astrophysical Objects (NIHAO) project. Our simulations, performed with NIHAO-like hydrodynamics which track the evolution of the Milky Way (MW) and M31 along with ∼100 dwarfs in the LG, reveal the total gas mass and stellar properties (velocity dispersion, evolution history, etc.) of present-day LG dwarfs to be similar to field systems. However, relative to field galaxies, LG dwarfs have more cold gas in their central parts and more metal-rich gas in the halo stemming from interactions with other dwarfs living in a high-density environment like the LG. Interestingly, the direct impact of massive MW/M31 analogues on the metallicity evolution of LG dwarfs is minimal; LG dwarfs accrete high-metallicity gas mostly from other dwarfs at late times. We have also tested for the impact of metal diffusion on the chemical evolution of LG dwarfs, and found that it does not affect the stellar or gaseous content of LG dwarfs. Our simulations suggest that the stellar components of LG dwarfs offer a unique and unbiased local laboratory for galaxy-formation tests and comparisons, especially against the overall dwarf population in the Universe