2010A&A...515A..61O


Query : 2010A&A...515A..61O

2010A&A...515A..61O - Astronomy and Astrophysics, volume 515, A61-61 (2010/6-1)

The dark matter halo shape of edge-on disk galaxies. II. Modelling the HI observations: methods.

O'BRIEN J.C., FREEMAN K.C. and VAN DER KRUIT P.C.

Abstract (from CDS):

This is the second paper of a series in which we attempt to put constraints on the flattening of dark halos in disk galaxies. For this purpose, we observe the HI in edge-on galaxies, where it is in principle possible to measure the force field in the halo vertically and radially from gas layer flaring and rotation curve decomposition respectively. To calculate the force fields, we need to analyse the observed XV diagrams to accurately measure all three functions that describe the planar kinematics and distribution of a galaxy: the radial HI surface density, the rotation curve and the HI velocity dispersion. In this paper, we discuss the improvements and limitations of the methods previously used to measure these HI properties. We extend the constant velocity dispersion method to include determination of the HI velocity dispersion as a function of galactocentric radius and perform extensive tests on the quality of the fits. We will apply this ``radial decomposition XV modelling method'' to our HI observations of 8 HI rich, late-type, edge-on galaxies in the third paper of this series.

Abstract Copyright:

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

Simbad objects: 32

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Number of rows : 32
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 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1553 1
2 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1592 2
3 NGC 1058 Sy2 02 43 30.0264850248 +37 20 28.782851784   12.29 11.75 10.85   ~ 449 0
4 ESO 416-25 GiC 02 48 40.805 -31 32 10.62   14.68   13.30 13.7 ~ 64 0
5 ESO 201-22 G 04 08 59.922 -48 43 37.49   14.73   14.3 13.8 ~ 54 0
6 IC 2058 EmG 04 17 54.3720552624 -55 55 57.738342360   13.90   12.94 13.2 ~ 88 2
7 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1692 1
8 ESO 564-27 G 09 11 54.664 -20 07 00.82   14.39   13.03 13.0 ~ 61 0
9 ESO 435-14 GiG 09 57 48.417 -28 30 23.57   14.44   13.06 13.7 ~ 58 1
10 IC 2531 EmG 09 59 55.6140265128 -29 37 04.575809208   13.19   11.54 12.1 ~ 136 1
11 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1311 3
12 ESO 435-50 G 10 10 50.4 -30 25 26   15.94   14.94   ~ 37 0
13 ESO 263-15 G 10 12 19.856 -47 17 41.51   14.42   12.87 13.4 ~ 44 0
14 NGC 3938 GiG 11 52 49.4335936248 +44 07 14.697085116 10.80 10.90 10.38     ~ 492 1
15 ESO 321-10 EmG 12 11 42.089 -38 32 54.82   14.26   12.39   ~ 59 0
16 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 533 1
17 UGC 7321 EmG 12 17 34.021 +22 32 23.35   14.07   13.21   ~ 244 0
18 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 839 2
19 NGC 4419 LIN 12 26 56.4505296720 +15 02 50.688833388 12.42 12.08 11.16     ~ 380 2
20 M 88 Sy2 12 31 59.1525062448 +14 25 13.148971824   14.33 13.18     ~ 763 1
21 NGC 4536 GiP 12 34 27.129 +02 11 16.37 11.14 11.16 10.55 17.393   ~ 795 3
22 ESO 269-15 GiC 12 57 13.154 -46 22 28.79   14.07   13.7 13.5 ~ 53 0
23 NGC 5023 EmG 13 12 11.8036148808 +44 02 17.328663600   13.2       ~ 236 0
24 NGC 5170 GiP 13 29 48.7664804592 -17 57 59.370796728   12.08 10.79 10.63 11.0 ~ 170 0
25 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2701 2
26 NGC 5474 GiP 14 05 01.608 +53 39 43.95   11.28 10.79     ~ 410 1
27 ESO 446-18 EmG 14 08 38.287 -29 34 19.34   14.91   13.48   ~ 58 0
28 NGC 5529 GiP 14 15 34.226 +36 13 37.12   12.9       ~ 146 2
29 IC 4871 GiG 19 35 42.224 -57 31 09.30   14.03   12.73 13.2 ~ 62 0
30 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2372 2
31 ESO 240-11 GiG 23 37 49.4188489776 -47 43 38.430144948   13.05   11.69 12.3 ~ 107 1
32 NAME NGC 6946 Group GrG ~ ~           ~ 16 0

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2022.05.24-10:08:30

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