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Accurate determination of the mass distribution in spiral galaxies

Blais-Ouellette, S. and Amram, P. and Carignan, C. and Swaters, R. (2004) Accurate determination of the mass distribution in spiral galaxies. Astronomy & Astrophysics, 420 (1). pp. 147-161. ISSN 0004-6361. doi:10.1051/0004-6361:20034263.

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High resolution Fabry-Perot data of six spiral galaxies are presented. Those data extend the previous sample of spiral galaxies studied with high resolution 3D spectroscopy to earlier morphological types. All the galaxies in the sample have available H I data at 21 cm from the VLA or Westerbork. Velocity fields are analyzed and Hα rotation curves are computed and compared to H I curves. The kinematics of NGC 5055 central regions are looked at more closely. Its peculiar kinematics can be interpreted either as a bipolar outflow or as a counter-rotating disk, possibly hosting a 9 ±2 x 10^8 M_⊙ compact object. Most of the Hα rotation curves present a significantly steeper inner slope than their H I counterparts. The 21 cm data thus seems affected by moderate to strong beam smearing. The beam smearing has an effect at higher scale-length/beam-width than previously thought (up to 20 km s^(-1) at a ratio of 8.5).

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Additional Information:© 2004 ESO. Received: 2 September 2003. Accepted: 1 March 2004. We warmly thank Jacques Boulesteix for his software and for fruitful discussions on Fabry-Perot data reduction, and the staff of the CFHT for their support during the Fabry-Perot data acquisition. We are indebted to Stéphanie Côté for the opportunity to re-observe NGC 5055 and to Olivier Hernandez who helped with the reduction of the NGC 2841 data. C.C. acknowledges grants from NSERC (Canada) and FQRNT (Québec).
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Fonds Québécois de la Recherche sur la Nature et les Technologies (Quebec, Canada) (FQRNT)UNSPECIFIED
Subject Keywords:Galaxy: fundamental parameters - galaxies: individual: IC 2574, NGC 3109, UGC 2259, NGC 5585, NGC 6503, NGC 2403, NGC 6946, NGC 3198, NGC 5055, NGC 2841, NGC 5985 - galaxies: kinematics and dynamics - cosmology: dark matter - techniques: radial velocities
Issue or Number:1
Record Number:CaltechAUTHORS:20180214-073749903
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Official Citation:Accurate determination of the mass distribution in spiral galaxies - III. Fabry-Perot imaging spectroscopy of 6 spiral galaxies S. Blais-Ouellette, P. Amram, C. Carignan and R. Swaters A&A, 420 1 (2004) 147-161 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84820
Deposited By: Ruth Sustaita
Deposited On:14 Feb 2018 20:26
Last Modified:15 Nov 2021 20:23

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