J/A+A/416/507 Minor-axis velocity gradients in disk galaxies (Coccato+, 2004)
Minor-axis velocity gradients in disk galaxies.
Coccato L., Corsini E.M., Pizzella A., Morelli L., Funes, J.G., Bertola F.
<Astron. Astrophys. 416, 507 (2004)>
=2004A&A...416..507C 2004A&A...416..507C
ADC_Keywords: Galaxies, rotation ; Radial velocities ; Velocity dispersion
Keywords: galaxies: kinematics and dynamics -
galaxies: cD, elliptical and lenticular - galaxies: spiral -
galaxies: structure
Abstract:
We present the ionized-gas kinematics and photometry of a sample of 4
spiral galaxies which are characterized by a zero-velocity plateau
along the major axis and a velocity gradient along the minor axis,
respectively. By combining these new kinematical data with those
available in the literature for the ionized-gas component of the S0s
and spirals listed in the Revised Shapley-Ames Catalog of Bright
Galaxies we realized that about 50% of unbarred galaxies show a
remarkable gas velocity gradient along the optical minor axis. This
fraction rises to about 60% if we include unbarred galaxies with an
irregular velocity profile along the minor axis. This phenomenon is
observed all along the Hubble sequence of disk galaxies, and it is
particularly frequent in early-type spirals. Since minor-axis velocity
gradients are unexpected if the gas is moving onto circular orbits in
a disk coplanar to the stellar one, we conclude that non-circular and
off-plane gas motions are not rare in the inner regions of disk
galaxies.
Objects:
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RA (2000) DE Designation(s)
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02 30 48.8 +37 08 10 NGC 949
07 56 52.3 +60 20 57 NGC 2460
08 14 40.4 +49 03 42 NGC 2541
19 43 34.2 -58 39 20 NGC 6810
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 39 627 Ionized gas kinematics for the sample galaxies
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See also:
J/A+A/360/439 : Stellar and ionized gas kinematics in NGC 4672 (Sarzi+ 2000)
J/A+A/382/488 : Stellar and ionized gas kinematics in NGC 2855 (Corsini+ 2002)
J/A+AS/131/105 : NGC 6221 ionized gas kinematics (Vega Beltran+ 1998)
J/AJ/124/3157 : Velocities in NGC 4449 (Valdez-Gutierrez+ 2002)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Name of the galaxy
10- 12 I3 deg PA Position angle of the slit
15- 19 F5.1 arcsec Rad [-73/83] Radius
21- 24 I4 km/s Vel Velocity
27- 28 I2 km/s e_Vel Velocity error
30- 32 I3 km/s sigma Velocity dispersion
34- 35 I2 km/s E_sigma Upper Velocity dispersion error
37- 38 I2 km/s e_sigma Lower Velocity dispersion error
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Acknowledgements:
Lodovico Coccato
(End) Patricia Bauer [CDS] 11-Dec-2003