J/A+A/391/519 Warps of galaxies (Castro-Rodriguez+, 2002)
Warps and correlations with intrinsic parameters of galaxies in the
visible and radio.
Castro-Rodriguez N., Lopez-Corredoira M., Sanchez-Saavedra M.L., Battaner E.
<Astron. Astrophys. 391, 519 (2002)>
=2002A&A...391..519C 2002A&A...391..519C
ADC_Keywords: Galaxies, optical ; Galaxies, radio ; Morphology ;
Radial velocities ; Rotational velocities
Keywords: galaxies: statistics - galaxies: spiral - galaxies: structure -
galaxies: kinematics and dynamics
Abstract:
From a comparison of the different parameters of warped galaxies in
the radio, and especially in the visible, we find that:
a) No large galaxy (large mass or radius) has been found to have high
amplitude in the warp, and there is no correlation of size/mass with
the degree of asymmetry of the warp.
b) The disc density and the ratio of dark to luminous mass show an
opposing trend: smaller values give more asymmetric warps in the inner
radii (optical warps) but show no correlation with the amplitude of
the warp; however, in the external radii is there no correlation with
asymmetry.
c) A third anticorrelation appears in a comparison of the amplitude
and degree of asymmetry in the warped galaxies. Hence, it seems that
very massive dark matter haloes have nothing to do with the formation
of warps but only with the degree of symmetry in the inner radii, and
are unrelated to the warp shape for the outermost radii. Denser discs
show the same dependence.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 51 197 Optical data
refs.dat 72 32 References for velocities in table1.dat
table2.dat 44 26 Radio data
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Galaxy name (PGC or NGC)
11- 12 I2 --- WarpE Warp amplitude on the east side of the
galaxy (1)
14- 15 I2 --- WarpW Warp amplitude on the west side of the
galaxy (1)
17- 20 I4 km/s cz Redshift of each galaxy taken from the NED
22- 23 A2 --- r_cz Reference for cz, in refs.dat file
25- 28 I4 km/s Vrot Rotation velocity of the galaxy at R25 (2)
30 A1 --- r_Vrot Reference for Vrot, in refs.dat file
33- 36 F4.2 [0.1arcmin] logD25 Diameter of the isophote with
25mag/arcsec2, from LEDA
38- 41 F4.1 mag Hmag ? H magnitude from 2MASS (3)
43- 48 F6.2 Mpc Dist ? Distance to the galaxy (4)
49 A1 --- r_Dist [*] Distance from Huchtmeier & Richter
(1989, Cat. VIII/68)
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Note (1): Warp amplitudes extracted from Sanchez-Saavedra et al.
(1990MNRAS.246..458S 1990MNRAS.246..458S, and 2002, A&A, in press).
These values divided by 100 give the tangent of the angle.
This is the angle between the galactic centre and the end of the warp.
Note (2): Rotation velocity of the galaxy at the radius of the isophote
with 25mag/arcsec2 (R25), which is more or less the maximum rotation
velocity. This parameter comes from several sources, mainly from
Mathewson et al. (1992ApJS...81..413M 1992ApJS...81..413M) and Persic & Salucci (1995,
Cat. J/ApJS/99/501).
Note (3): H magnitude form Jarret et al., 2000AJ....119.2498J 2000AJ....119.2498J and
de Vaucouleurs & Longo, 1988, Catalogue of visual and infrared
photometry of galaxies from 0.5µm to 10µm (1961-1985) (The
University of Texas, Texas)
Note (4): Distance to the galaxy, obtained using the redshift value and
the Tully-Fisher relation with a Hubble constant of 75km/s/Mpc. This
method is not very accurate for very close galaxies; therefore, when
the redshift is less than 1000km/s, we used distances from Huchtmeier
& Richter (1989, Cat. VIII/68).
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Ref Reference code
4- 22 A19 --- BibCode BibCode
24- 44 A21 --- Aut Author's name
46- 72 A27 --- Com Comments
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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2- 5 I4 --- UGC UGC number
7- 11 F5.2 --- WarpE Warp amplitude on the east side of the
galaxy (1)
13- 17 F5.2 --- WarpW Warp amplitude on the west side of the
galaxy (1)
19- 23 I5 km/s cz Redshift of each galaxy (2)
25- 27 I3 km/s Vrot Rotation velocity of the galaxy at R25 (2)
29- 32 F4.2 [0.1arcmin] logD25 Diameter of the isophote with
25mag/arcsec2 (2)
34 A1 --- r_Hmag [*] *: Hmag form Tormen et al. (1995,
Cat. J/ApJS/96/123), else from 2MASS
35- 38 F4.1 mag Hmag H magnitude
40- 44 F5.1 Mpc Dist ? Distance (1)
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Note (1): Data from Garcia-Ruiz (2001, Ph.D. Thesis, University of Groningen,
The Netherlands)
Note (2): Data from Garcia-Ruiz (2001, Ph.D. Thesis, University of Groningen,
The Netherlands) and LEDA database
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 01-Oct-2002