Kinematics and Mass Modeling of Messier 33: Halpha observations

As part of a long-term project to revisit the kinematics and dynamics of the large disc galaxies of the Local Group, we present the first deep, wide-field (42' x 56') 3D-spectroscopic survey of the ionized gas disc of Messier 33. Fabry-Perot interferometry has been used to map its Ha distr...

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Bibliographic Details
Published in:arXiv.org 2015-03
Main Authors: Kam, Zacharie Sie, Carignan, Claude, Chemin, Laurent, Amram, Philippe, Epinat, Benoit
Format: Article
Language:English
Subjects:
Accretion disks
Angular resolution
Dark matter
Disk galaxies
Inclination
Kinematics
Local group (astronomy)
Molecular gases
Optical properties
Optical rotation
Photometry
Resolution
Rotation
Star formation
Velocity
Velocity distribution
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Summary:As part of a long-term project to revisit the kinematics and dynamics of the large disc galaxies of the Local Group, we present the first deep, wide-field (42' x 56') 3D-spectroscopic survey of the ionized gas disc of Messier 33. Fabry-Perot interferometry has been used to map its Ha distribution and kinematics at unprecedented angular resolution ( 6.5 kpc. The reason for this discrepancy is not well understood. The velocity dispersion profile is relatively flat around 16 km/s, which is at the low end of velocity dispersions of nearby star-forming galactic discs. A strong relation is also found between the Ha velocity dispersion and the Ha intensity. Mass models were obtained using the Ha rotation curve but, as expected, the dark matter halo's parameters are not very well constrained since the optical rotation curve only extends out to 8 kpc.
ISSN:2331-8422
DOI:10.48550/arxiv.1503.02538