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J/A+A/342/671       Early-type spiral galaxies kinematics (Corsini+ 1999)
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Dark Matter in early-type spiral galaxies: the case of NGC 2179 and of NGC 2775
       Corsini E.M., Pizzella A., Sarzi M., Cinzano P., Vega Beltran J.C.,
       Funes J.G.S.J., Bertola F., Persic M., Salucci P.
      <Astron. Astrophys. 342, 671 (1999)>
      =1999A&A...342..671C      (SIMBAD/NED BibCode)
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ADC_Keywords: Galaxies, optical ; Radial velocities ; Velocity dispersion
Keywords: galaxies: individual: NGC 2179, NGC 2775 -
          galaxies: kinematics and dynamics - galaxies: spiral -
          galaxies: dark matter

Abstract:
    We present the stellar and ionized-gas velocity curves and
    velocity-dispersion profiles along the major axis for six early-type
    spiral galaxies. Two of these galaxies, namely NGC 2179 and NGC 2775,
    are particularly suited for the study of dark matter halos. Using
    their luminosity profiles and modeling their stellar and gaseous
    kinematics, we derive the mass contributions of the luminous and the
    dark matter to the total potential. In NGC 2179 we find that the data
    (measured out to about the optical radius R_opt_) unambiguously
    require the presence of a massive dark halo. For the brighter and
    bigger object NGC 2775, we can rule out a significant halo
    contribution at radii R<~0.6R_opt_. Although preliminary, these
    results agree with the familiar mass distribution trend known for
    late-type spirals of comparable mass.

Objects:
    ----------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    ----------------------------------------------------------
    11 43 34.7   +08 56 30   IC 724
    06 08 02.1   -21 44 48   NGC 2179
    09 10 20.4   +07 02 19   NGC 2775
    10 31 52.1   -34 51 13   NGC 3281
    12 48 23.0   +08 29 14   NGC 4698
    12 58 01.4   +01 34 30   NGC 4845
    ----------------------------------------------------------

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
halpha.dat         46      236   H{alpha} kinematics
nii6583.dat        46      281   [NII] ({lambda}6583.4{AA} kinematics
nii6548.dat        46      133   [NII] ({lambda}6548.0{AA} kinematics
sii6716.dat        47      160   [SII] ({lambda}6716.5{AA} kinematics
sii6730.dat        46      122   [SII] ({lambda}6730.8{AA} kinematics
gaskin.dat         39      304   Ionized gas kinematics
stelkin.dat        48      292   Stellar kinematics
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See also:
       VII/72 : Catalog of stellar velocity dispersions. I (Whitmore+ 1985)
 J/AJ/109/874 : Kinematics of MKW and AWM Poor Clusters (Beers+ 1995)

Byte-by-byte Description of file: halpha.dat, nii6583.dat, sii6716.dat
Byte-by-byte Description of file: nii6548.dat, sii6730.dat
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   Bytes Format Units     Label     Explanations
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   1-  8  A8    ---       Galaxy    Galaxy name (1)
  10- 15  F6.1  arcsec    r         Galactocentric distance
  19- 22  I4    km/s      HRV       Heliocentric radial velocity measured along
                                     the major axis
  26- 27  I2    km/s    e_HRV       Heliocentric radial velocity error
  31- 33  I3    km/s      sigma     Velocity dispersion measured along the
                                     major axis
  36- 37  I2    ---       n         Number of rebinned rows
  41- 45  F5.1  ---       S/N       ? Signal-to-noise ratio
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Note (1): halpha.dat, nii6583.dat and sii6716.dat: All galaxies data
          nii6548.dat: NGC 2775, 3281, 4698 and 4845 data
          sii6730.dat: NGC 2179, 2775, 3281, 4698, 4845 data
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Byte-by-byte Description of file: gaskin.dat, stelkin.dat
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   Bytes Format Units     Label     Explanations
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   1-  8  A8    ---       Galaxy    Galaxy name (1)
  10- 15  F6.1  arcsec    r         Galactocentric distance
  19- 22  I4    km/s      HRV       Heliocentric radial velocity
  25- 27  I3    km/s    e_HRV       Heliocentric radial velocity error
  31- 33  I3    km/s      sigma     Velocity dispersion
  37- 38  I2    km/s    e_sigma     Velocity dispersion error
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Note (1): gaskin.dat and stelkin.dat: All galaxies data
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Acknowledgements: Enrico Maria Corsini <corsini@astras.pd.astro.it>
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(End)                                         Patricia Bauer [CDS]   25-Sep-1998