2005A&A...430...67F


Query : 2005A&A...430...67F

2005A&A...430...67F - Astronomy and Astrophysics, volume 430, 67-81 (2005/1-4)

The orientation parameters and rotation curves of 15 spiral galaxies.

FRIDMAN A.M., AFANASIEV V.L., DODONOV S.N., KHORUZHII O.V., MOISEEV A.V., SIL'CHENKO O.K. and ZASOV A.V.

Abstract (from CDS):

We analyzed ionized gas motion and disk orientation parameters for 15 spiral galaxies. Their velocity fields were measured with the Hα emission line by using the Fabry-Perot interferometer at the 6 m telescope of SAO RAS. Special attention is paid to the problem of estimating the position angle of the major axis (PA0) and the inclination (i) of a disk, which strongly affect the derived circular rotation velocity. We discuss and compare different methods of obtaining these parameters from kinematic and photometric observations, taking into account the presence of regular velocity (brightness) perturbations caused by spiral density waves. It is shown that the commonly used method of tilted rings may lead to systematic errors in the estimation of orientation parameters (and hence of circular velocity) being applied to galaxies with an ordered spiral structure. Instead we recommend using an assumption of constancy of i and PA0 along a radius, to estimate these parameters. For each galaxy of our sample we present monochromatic Hα- and continuum maps, velocity fields of ionized gas, and the mean rotation curves in the frame of a model of pure circular gas motion. Significant deviations from circular motion with amplitudes of several tens of km/s (or higher) are found in almost all galaxies. The character and possible nature of the non-circular motion are briefly discussed.

Abstract Copyright:

Journal keyword(s): galaxies: kinematics and dynamics - galaxies: spiral

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 23 G 00 09 53.411 +25 55 25.46   12.5       ~ 298 3
2 NGC 615 GiG 01 35 05.6880367176 -07 20 24.841575348   12.8   11.43 12.2 ~ 133 0
3 NGC 972 rG 02 34 13.3574389680 +29 18 40.604917356   12.1 13.63     ~ 164 2
4 NGC 1084 GiG 02 45 59.926 -07 34 43.10 11.22 11.59 10.73 10.55 11.1 ~ 345 2
5 NGC 1134 IG 02 53 41.3598078576 +13 00 51.209541468   13.2       ~ 108 1
6 NGC 2964 GiP 09 42 54.251 +31 50 49.97   12.0       ~ 265 1
7 NGC 3583 GiP 11 14 10.979 +48 19 06.16   11.6       ~ 185 1
8 NGC 3893 GiP 11 48 38.207 +48 42 38.84   11.23 10.67     ~ 352 1
9 NGC 4100 GiG 12 06 08.602 +49 34 56.32   11.7       ~ 230 0
10 NGC 4136 GiG 12 09 17.7035859024 +29 55 39.419783832   11.69       ~ 216 1
11 NGC 4414 GiG 12 26 27.1276893168 +31 13 24.626206488 11.12 10.96 10.12     ~ 539 2
12 NGC 4814 GiP 12 55 21.9135450888 +58 20 38.643555048   12.4       ~ 95 0
13 NGC 5390 LIN 13 55 39.9385716624 +40 27 42.380606592   12.81 11.93 10.04   ~ 334 1
14 NGC 6643 G 18 19 46.370 +74 34 06.23   11.80       ~ 295 1
15 IC 1525 GiG 23 59 15.8326855080 +46 53 21.123053088   13.3       ~ 44 0

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2022.05.24-04:17:21

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