Kinematics and mass modelling of M33: Hα 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 arcmin × 56 arcmin) 3D-spectroscopic survey of the ionized gas disc of Messier 33. Fabry–Perot interferometry has been used to map its Hα di...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2015-06, Vol.449 (4), p.4048-4070
Main Authors: Kam, Z. S., Carignan, C., Chemin, L., Amram, P., Epinat, B.
Format: Article
Language:English
Subjects:
Discs
Disks
Dispersions
Kinematics
Molecular structure
Photometry
Resolution
Spirals
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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 arcmin × 56 arcmin) 3D-spectroscopic survey of the ionized gas disc of Messier 33. Fabry–Perot interferometry has been used to map its Hα distribution and kinematics at unprecedented angular resolution (≲3 arcsec) and resolving power (∼12 600), with the 1.6 m telescope at the Observatoire du Mont Mégantic. The ionized gas distribution follows a complex, large-scale spiral structure, unsurprisingly coincident with the already-known spiral structures of the neutral and molecular gas discs. The kinematical analysis of the velocity field shows that the rotation centre of the Hα disc is distant from the photometric centre by ∼168 pc (sky-projected distance) and that the kinematical major-axis position angle and disc inclination are in excellent agreement with photometric values. The Hα rotation curve agrees very well with the H i rotation curves for 0 
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stv517