2003A&A...408..873C


Query : 2003A&A...408..873C

2003A&A...408..873C - Astronomy and Astrophysics, volume 408, 873-885 (2003/9-4)

Minor-axis velocity gradients in spirals and the case of inner polar disks'.

CORSINI E.M., PIZZELLA A., COCCATO L. and BERTOLA F.

Abstract (from CDS):

We measured the ionized-gas and stellar kinematics along the major and minor axis of a sample of 10 early-type spirals. Much to our surprise we found a remarkable gas velocity gradient along the minor axis of 8 of them. According to the kinematic features observed in their ionized-gas velocity fields, we divide our sample galaxies in three classes of objects. (i) NGC 4984, NGC 7213, and NGC 7377 show an overall velocity curve along the minor axis without zero-velocity points, out to the last measured radius, which is interpreted as due to the warped structure of the gaseous disk. (ii) NGC 3885, NGC 4224, and NGC 4586 are characterized by a velocity gradient along both major and minor axis, although non-zero velocities along the minor axis are confined to the central regions. Such gas kinematics have been explained as being due to non-circular motions induced by a triaxial potential. (iii) NGC 2855 and NGC 7049 show a change of slope of the velocity gradient measured along the major axis (which is shallower in the center and steeper away from the nucleus), as well as non-zero gas velocities in the central regions of the minor axis. This has been attributed to the presence of a kinematically-decoupled gaseous component in orthogonal rotation with respect to the galaxy disk, namely an inner polar disk. The case and origin of inner polar disks are discussed and the list of their host galaxies is presented.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/408/873): table3.dat table4.dat>

Simbad objects: 25

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Number of rows : 25
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 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3150 2
2 IC 1689 GiG 01 23 47.8730638824 +33 03 19.075686660   14.8       ~ 49 0
3 NGC 1638 GiG 04 41 36.4999390848 -01 48 32.525796348   12.6   12.2 12.3 ~ 68 0
4 NGC 2217 LIN 06 21 39.7505036352 -27 14 01.654973556   11.04 11.93 9.78 10.5 ~ 158 0
5 NGC 2681 LIN 08 53 32.7183058512 +51 18 49.159212120 11.40 11.09 10.29     ~ 311 1
6 NGC 2855 G 09 21 27.4894926552 -11 54 34.337758068   13.24 12.23 10.77   ~ 89 0
7 NGC 2841 LIN 09 22 02.6778711696 +50 58 35.737082868 10.43 10.09 9.22     ~ 1030 1
8 UGC 5600 GiP 10 24 10.1194757376 +78 37 43.361613408   14.4       ~ 47 0
9 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 783 1
10 NGC 3885 EmG 11 46 46.4536031880 -27 55 20.056518516 12.19 12.68 11.89 11.46   ~ 124 1
11 NGC 4224 GiP 12 16 33.7856435496 +07 27 43.527631068   13.3       ~ 142 0
12 NGC 4235 Sy1 12 17 09.8818997904 +07 11 29.673389004   14.70 13.60     ~ 386 0
13 M 91 LIN 12 35 26.4446761320 +14 29 46.760333748   14.63 13.57     ~ 561 0
14 NGC 4586 GiG 12 38 28.4097889776 +04 19 09.089292180   13.5       ~ 136 0
15 NGC 4672 GiG 12 46 15.7249021968 -41 42 21.407260572   14.12 14.25 12.60 12.9 ~ 72 0
16 NGC 4698 Sy2 12 48 22.9082830584 +08 29 14.667552276   13.24 12.27     ~ 463 0
17 NGC 4984 GiG 13 08 57.2555329728 -15 30 58.743722520   12   10.92   ~ 127 0
18 NGC 5850 LIN 15 07 07.6828131840 +01 32 39.513281352   11.5   10.79 11.1 ~ 301 1
19 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2836 4
20 NGC 6340 GiP 17 10 24.8346254376 +72 18 15.919996608   11.87 11.01     ~ 182 1
21 NGC 7049 GiP 21 19 00.2856324192 -48 33 43.713475092   11.28 10.74 9.77   ~ 135 1
22 NGC 7217 LIN 22 07 52.3984675584 +31 21 33.632293572   12.94 11.92     ~ 476 0
23 NGC 7213 Sy1 22 09 16.2100443720 -47 10 00.115999716   10.97 12.08 10.50 10.6 ~ 623 0
24 NGC 7280 GiP 22 26 27.5758899936 +16 08 53.421593496   13.6       ~ 154 0
25 NGC 7377 LIN 22 47 47.4743722752 -22 18 43.770561516   11.39 12.78 10.53   ~ 94 0

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2022.08.10-19:16:59

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