J/A+A/420/147 Velocity in 6 spiral galaxies (Blais-ouellette+, 2004)
Accurate determination of the mass distribution in spiral galaxies.
III. Fabry-Perot imaging spectroscopy of 6 spiral galaxies.
Blais-Ouellette S., Amram P., Carignan C., Swaters R.
<Astron. Astrophys., 420, 147-161 (2004)>
=2004A&A...420..147B 2004A&A...420..147B
ADC_Keywords: Galaxies, rotation ; Radial velocities
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
Abstract:
High resolution Fabry-Perot data of six spiral galaxies are presented.
Those data extend the previous sample of spiral galaxies studied with
high resolution 3-D spectroscopy to earlier morphological types. All
the galaxies in the sample have available HI data at 21cm from the VLA
or Westerbork. Velocity fields are analyzed and Hα rotation
curves are computed and compared to HI 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±2x108M_☉-compact
object.
Most of the Hα rotation curves present a significantly steeper
inner slope than their HI counterparts. The 21cm 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 20km/s at a ratio of 8.5).
Description:
Hα rotation curves for 6 spiral galaxies are presented. The
galaxies are UGC 2259, NGC 2403, NGC 6946, NGC 5055, NGC 2841,
NGC 5985.
For each galaxy each row of the table describes the data at a given
distance from the galactic center.
Objects:
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RA (2000) DE Designation(s) (File)
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02 47 55.6 +37 32 17 UGC 2259 (tablea1.dat)
07 36 50.6 +65 36 10 NGC 2403 (tablea2.dat)
20 34 52.7 +60 09 14 NGC 6946 (tablea3.dat)
13 15 49.3 +42 01 46 NGC 5055 (tablea4.dat)
09 22 02.0 +50 58 40 NGC 2841 (tablea5.dat)
15 39 36.8 +59 19 52 NGC 5985 (tablea6.dat)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 39 27 Optical rotation curve of UGC 2259 at 2.6" resolution
tablea2.dat 39 90 Optical rotation curve of NGC 2403 at 6.6" resolution
tablea3.dat 39 68 Optical rotation curve of NGC 6946 at 4.4" resolution
tablea4.dat 39 137 Optical rotation curve of NGC 5055 at 2.2" resolution
tablea5.dat 42 43 Optical rotation curve of NGC 2841 at 4.4" resolution
tablea6.dat 39 42 Optical rotation curve of NGC 5985 at 4" resolution
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Byte-by-byte Description of file: tablea?.dat
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Bytes Format Units Label Explanations
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1- 6 F6.2 arcsec R Distance to the center
8- 11 I4 --- Napp ? Number of velocity points for the
approaching side
13- 15 I3 km/s Vapp ? Average velocity for the approaching side
17- 19 I3 km/s sigmaapp ? Square root of the variance of the
velocities for the approaching side
21- 24 I4 --- Nrec ? Number of velocity points for the
receding side
26- 28 I3 km/s Vrec ? Average velocity for the receding side
30- 32 I3 km/s sigmarec ? Square root of the variance of the
receding for the approaching side
34- 36 I3 km/s Vel Average velocity and uncertainty
38- 39 I2 km/s e_Vel ? rms uncertainty on Vel
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Table A7: Rotation curve of NGC 5985 at ∼10" binning (30" resolution)
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R (") Vel (km/s)
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60 294.2 ± 9.21
75 299.0 ± 5.94
90 297.3 ± 3.31
105 295.6 ± 3.42
120 295.9 ± 3.23
135 297.1 ± 3.72
150 292.4 ± 4.49
165 288.6 ± 5.40
180 285.1 ± 5.89
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Acknowledgements: Sebastien Ouellette
References:
Blais-Ouellette et al., Paper I 1999AJ....118.2123B 1999AJ....118.2123B
Blais-Ouellette et al., Paper II 2001AJ....121.1952B 2001AJ....121.1952B
(End) Patricia Bauer [CDS] 01-Jun-2004