@Article{KamCaChFoElJa:2017:HIKiMa,
author = "Kam, S. Z. and Carignan, C. and Chemin, Laurent and Foster, T. and
Elson, E. and Jarrett, T. H.",
affiliation = "{Observatoire d’Astrophysique de l’Universit{\'e} Ouaga I Pr
Joseph Ki-Zerbo (ODAUO)} and {Observatoire d’Astrophysique de
l’Universit{\'e} Ouaga I Pr Joseph Ki-Zerbo (ODAUO)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Dominion
Radio Astrophysical Observatory} and {University of Cape Town} and
{University of Cape Town}",
title = "HI kinematics and mass distribution of messier 33",
journal = "The Astronomical Journal",
year = "2017",
volume = "154",
number = "1",
month = "July",
keywords = "galaxies: individual (M33), galaxies: kinematics and dynamics,
Local Group, techniques: interferometric.",
abstract = "A new deep H I survey of the galaxy Messier 33 is presented, based
on observations obtained at the Dominion Radio Astrophysical
Observatory. We observe a perturbed outer gas distribution and
kinematics in M33, and confirm the disk warping as a significant
twist of the major axis of the velocity field, although no strong
tilt is measured, in agreement with previous work. Evidence for a
new low-brightness H I component with anomalous velocity is
reported. It harbors a large velocity scatter, as its kinematics
both exceeds and lags the rotation of the disk, and leaks in the
forbidden velocity zone of apparent counterrotation. The
observations also reveal wide and multiple-peak H I profiles that
can be partly explained by crowded orbits in the framework of the
warp model. Asymmetric motions are identified in the velocity
field as possible signatures of a lopsided potential and the warp.
The mass distribution modeling of the hybrid H alpha-H I rotation
curve favors a cuspy dark matter halo with a concentration in
disagreement with the Lambda CDM dark halo mass-concentration
relationship. The total mass enclosed in 23 kpc is 8 10(10) M
circle dot, of which 11% are stars and gas. At the virial radius
of the cuspy halo, the resulting total mass is 5 10(11) M circle
dot, but with a baryonic mass fraction of only 2%. This strongly
suggests a more realistic radius encompassing the total mass of
M33 that is well smaller than the virial radius of the halo,
possibly comparable to the size of the H I disk.",
doi = "10.3847/1538-3881/aa79f3",
url = "http://dx.doi.org/10.3847/1538-3881/aa79f3",
issn = "0004-6256",
language = "en",
targetfile = "kam_h1.pdf",
urlaccessdate = "27 abr. 2024"
}