J/A+A/342/671 Early-type spiral galaxies kinematics (Corsini+ 1999)
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 1999A&A...342..671C
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 Ropt) 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≲0.6Ropt. 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:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
halpha.dat 46 236 Hα kinematics
nii6583.dat 46 281 [NII] (λ6583.4Å kinematics
nii6548.dat 46 133 [NII] (λ6548.0Å kinematics
sii6716.dat 47 160 [SII] (λ6716.5Å kinematics
sii6730.dat 46 122 [SII] (λ6730.8Å kinematics
gaskin.dat 39 304 Ionized gas kinematics
stelkin.dat 48 292 Stellar kinematics
--------------------------------------------------------------------------------
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 nii65??.dat sii67??.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
Byte-by-byte Description of file: gaskin.dat stelkin.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
Note (1): gaskin.dat and stelkin.dat: All galaxies data
--------------------------------------------------------------------------------
Acknowledgements: Enrico Maria Corsini
(End) Patricia Bauer [CDS] 25-Sep-1998