2002AJ....124.3157V


Query : 2002AJ....124.3157V

2002AJ....124.3157V - Astron. J., 124, 3157-3178 (2002/December-0)

Unveiling the kinematics and dynamics of ionized gas in the nearby irregular galaxy NGC 4449.

VALDEZ-GUTIERREZ M., ROSADO M., PUERARI I., GEORGIEV L., BORISSOVA J. and AMBROCIO-CRUZ P.

Abstract (from CDS):

A detailed kinematic analysis of ionized gas in the nearby irregular galaxy NGC 4449 is presented. Observations were conducted in the spectral lines of Hα and [S II]. Our scanning Fabry-Perot interferometric observations are presented from both a global and a local perspective. We have analyzed the global velocity field, the spatially extended diffuse gaseous component, and the H II region populations and, furthermore, have determined the rotation curve based on the heliocentric radial velocities of the global Hα spatial distribution. Our results for NGC 4449 show that the optical velocity field decreases in radial velocity along the optical bar from northeast to southwest, presenting an anticorrelation relative to the outer velocity field of the H I component. This is in agreement with previous studies. The diffuse gaseous component that permeates the entire galaxy is analyzed (up to a limiting surface brightness of ∼3.165x10–5 ergs.cm–2.s–1.sr–1) in terms of its radial velocity field, as well as its velocity dispersions. We find that the diffuse gas component presents peculiar kinematic features, such as abrupt velocity gradients and highly supersonic velocity dispersions (σ∼4 times the values of the nearest H II regions), but that its kinematic and dynamical influence is important on both global and local scales. The optical rotation curve of this nearby irregular galaxy shows that the northeast sector rotates like a solid body (vrot∼40 km.s–1 at R=2 kpc). In contrast, for the southwest side our results are not conclusive; the behavior of the gas at those locations is chaotic. We conclude that the origin of such complex kinematics and dynamics is undoubtedly related to the aftermath of an interaction experienced by this galaxy in the past.

Abstract Copyright:

Journal keyword(s): Galaxies: Individual: NGC Number: NGC 4449 - Galaxies: Irregular - Galaxies: ISM - Galaxies: Kinematics and Dynamics - ISM: General

VizieR on-line data: <Available at CDS (J/AJ/124/3157): table3.dat table4.dat>

Nomenclature: Fig.2, Table 3: [VRP2002b] ANNN (Nos M1 to M101). Fig.10, Table 4: [VRP2002b] ANN (Nos V1 to V84).

Simbad objects: 96

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Number of rows : 96
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 2049 2
2 NGC 922 EmG 02 25 04.400 -24 47 17.46   12.54 12.21 11.84   ~ 130 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15530 1
4 M 42 HII 05 35 17.3 -05 23 28           ~ 3826 0
5 NAME Ori A MoC 05 38 -07.1           ~ 2787 0
6 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5478 6
7 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 887 1
8 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 522 1
9 UGC 7577 GiG 12 27 41.8803124881 +43 29 58.140216428 13.75 13.10 12.7 12.33   ~ 234 0
10 [BCH97] SGS 3 PoG 12 27 56.7 +44 05 40           ~ 2 0
11 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1042 1
12 NAME CVn I Group GrG 12 32 48.3 +33 57 07           ~ 136 0
13 IC 4182 BiC 13 05 48.7470958923 +37 36 13.015792630   11.86   11.40   ~ 322 1
14 NGC 5195 GiP 13 29 59.590 +47 15 58.06 10.76 10.45 9.55 9.31   ~ 718 3
15 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1957 0
16 HD 338808 HS* 19 44 26.1388988534 +26 13 16.682298603 10.92 11.03 10.47     sdB0.5VIpHe9 91 0
17 [H69] NGC 4449 25 HII ~ ~           ~ 4 0
18 [VRP2002b] V32 HII ~ ~           ~ 6 0
19 [H69] NGC 4449 28 HII ~ ~           ~ 4 0
20 [H69] NGC 4449 30 HII ~ ~           ~ 6 0
21 [H69] NGC 4449 32 HII ~ ~           ~ 4 0
22 [H69] NGC 4449 35 HII ~ ~           ~ 5 0
23 [H69] NGC 4449 37 HII ~ ~           ~ 5 0
24 [H69] NGC 4449 38 HII ~ ~           ~ 4 0
25 [H69] NGC 4449 39 HII ~ ~           ~ 6 0
26 [H69] NGC 4449 41 HII ~ ~           ~ 5 0
27 [H69] NGC 4449 42 HII ~ ~           ~ 5 0
28 [H69] NGC 4449 43 HII ~ ~           ~ 6 0
29 [H69] NGC 4449 45 HII ~ ~           ~ 6 0
30 [H69] NGC 4449 47 HII ~ ~           ~ 6 0
31 [H69] NGC 4449 50 HII ~ ~           ~ 4 0
32 [H69] NGC 4449 51 HII ~ ~           ~ 6 0
33 [H69] NGC 4449 53 HII ~ ~           ~ 4 0
34 [H69] NGC 4449 55 HII ~ ~           ~ 4 0
35 [H69] NGC 4449 59 HII ~ ~           ~ 4 0
36 [H69] NGC 4449 60 HII ~ ~           ~ 3 0
37 [H69] NGC 4449 61 HII ~ ~           ~ 4 0
38 [H69] NGC 4449 62 HII ~ ~           ~ 4 0
39 [H69] NGC 4449 63 HII ~ ~           ~ 4 0
40 [H69] NGC 4449 64 HII ~ ~           ~ 6 0
41 [H69] NGC 4449 65 HII ~ ~           ~ 4 0
42 [H69] NGC 4449 66 HII ~ ~           ~ 4 0
43 [H69] NGC 4449 68 HII ~ ~           ~ 6 0
44 [H69] NGC 4449 73 HII ~ ~           ~ 3 0
45 [H69] NGC 4449 76 HII ~ ~           ~ 3 0
46 [H69] NGC 4449 81 HII ~ ~           ~ 4 0
47 [SB79b] 239 HII ~ ~           ~ 2 0
48 [SB79b] 240 HII ~ ~           ~ 2 0
49 [SB79b] 244 HII ~ ~           ~ 2 0
50 [SB79b] 245 HII ~ ~           ~ 2 0
51 [SB79b] 248 HII ~ ~           ~ 2 0
52 [CM69] NGC 4449 46 HII ~ ~           ~ 2 0
53 [SB79b] 108 HII ~ ~           ~ 3 0
54 [SB79b] 128 HII ~ ~           ~ 3 0
55 [VRP2002b] V47 HII ~ ~           ~ 4 0
56 [SB79b] 151 HII ~ ~           ~ 4 0
57 [SB79b] 153 HII ~ ~           ~ 4 0
58 [SB79b] 159 HII ~ ~           ~ 3 0
59 [SB79b] 178 HII ~ ~           ~ 4 0
60 [SB79b] 190 HII ~ ~           ~ 3 0
61 [SB79b] 13 HII ~ ~           ~ 3 0
62 [SB79b] 203 HII ~ ~           ~ 4 0
63 [SB79b] 212 HII ~ ~           ~ 3 0
64 [SB79b] 222 HII ~ ~           ~ 3 0
65 [SB79b] 226 HII ~ ~           ~ 3 0
66 [SB79b] 63 HII ~ ~           ~ 3 0
67 [SB79b] 90 HII ~ ~           ~ 3 0
68 [SB79b] 99 HII ~ ~           ~ 3 0
69 [SB79b] 113 HII ~ ~           ~ 3 0
70 [SB79b] 134 HII ~ ~           ~ 3 0
71 [SB79b] 138 HII ~ ~           ~ 3 0
72 [SB79b] 150 HII ~ ~           ~ 3 0
73 [SB79b] 161 HII ~ ~           ~ 3 0
74 [SB79b] 170 HII ~ ~           ~ 4 0
75 [SB79b] 183 HII ~ ~           ~ 3 0
76 [SB79b] 197 HII ~ ~           ~ 3 0
77 [H69] NGC 4449 49 HII ~ ~           ~ 5 0
78 [SB79b] 234 HII ~ ~           ~ 2 0
79 [SB79b] 117 HII ~ ~           ~ 2 0
80 [SB79b] 221 HII ~ ~           ~ 2 0
81 [SB79b] 191 HII ~ ~           ~ 3 0
82 [H69] NGC 4449 2 HII ~ ~           ~ 3 0
83 [H69] NGC 4449 3 HII ~ ~           ~ 3 0
84 [VRP2002b] V8 HII ~ ~           ~ 3 0
85 [H69] NGC 4449 5 HII ~ ~           ~ 4 0
86 [H69] NGC 4449 6 HII ~ ~           ~ 3 0
87 [H69] NGC 4449 11 HII ~ ~           ~ 4 0
88 [H69] NGC 4449 12 HII ~ ~           ~ 3 0
89 [H69] NGC 4449 13 HII ~ ~           ~ 3 0
90 [H69] NGC 4449 15 HII ~ ~           ~ 3 0
91 [H69] NGC 4449 16 HII ~ ~           ~ 4 0
92 [H69] NGC 4449 17 HII ~ ~           ~ 4 0
93 [H69] NGC 4449 18 HII ~ ~           ~ 3 0
94 [H69] NGC 4449 19 HII ~ ~           ~ 3 0
95 [H69] NGC 4449 20 HII ~ ~           ~ 3 0
96 [H69] NGC 4449 21 HII ~ ~           ~ 4 0

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2021.09.17-15:43:13

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