2002A&A...392..473S


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET21:40:57

2002A&A...392..473S - Astronomy and Astrophysics, volume 392, 473-487 (2002/9-3)

HI distribution and kinematics of NGC 1569.

STIL J.M. and ISRAEL F.P.

Abstract (from CDS):

We present WSRT observations of high sensitivity and resolution of the neutral hydrogen in the starburst dwarf galaxy NGC 1569. Assuming a distance of 2.2Mpc, we find a total HI mass of 1.3x108M to be distributed in the form of a dense, clumpy ridge surrounded by more extended diffuse HI containing a few additional discrete features, such as a Western HI Arm and an HI bridge reaching out to a small counterrotating companion cloud. About 10% by mass of all HI in NGC 1569 is at unusually high velocities. Some of this HI may be associated with the mass outflow evident from Hα measurements, but some may also be associated with NGC 1569's HI companion and intervening HI bridge, in which case, infall rather than outflow might be the cause of the discrepant velocities. No indication of a large bubble structure was found in position-velocity maps of the high-velocity HI. The galaxy as a whole is in modest overall rotation, but the HI gas lacks any sign of rotation within 60" (0.6kpc) from the center, i.e. over most of the optical galaxy. Here, turbulent motions resulting from the starburst appear to dominate over rotation. In the outer disk, the rotational velocities reach a maximum of 35±6km/s, but turbulent motion remains significant. Thus, starburst effects are still noticeable in the outer HI disk, although they are no longer dominant beyond 0.6kpc. Even excluding the most extreme high-velocity HI clouds, NGC 1569 still has an unusually high mean HI velocity dispersion of σv=21.3km/s, more than double that of other dwarf galaxies.

Abstract Copyright:

Journal keyword(s): ISM: atoms - galaxies: individual: NGC 1569 - irregular - kinematics and dynamics - starburst

Nomenclature: Table 2: [SI2002] HVN (Nos HV1-HV7).

Simbad objects: 24

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Number of rows : 24

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 NAME IC 342 Group GrG 03 48 42 +68 00.8           ~ 98 1
2 [SI2002] HV1 PoC 04 30 30.0 +64 51 46           ~ 1 0
3 [SI2002] HV3 PoC 04 30 41.4 +64 51 00           ~ 2 0
4 [SI2002] HV2 PoC 04 30 41.4 +64 51 15           ~ 1 0
5 [W91] Arm PoC 04 30 42.7 +64 51 01           ~ 3 0
6 [SI2002] HV4 PoC 04 30 43.5 +64 49 15           ~ 1 0
7 [SI2002] HV5 PoC 04 30 44.4 +64 50 15           ~ 1 0
8 HK NGC 1569 45 MoC 04 30 46.7 +64 50 59           ~ 22 1
9 NAME NGC 1569 CL* C Cl* 04 30 47.26 +64 51 02.3   18.85 17.41     ~ 18 1
10 [W91] 3 HII 04 30 48.0 +64 50 56           ~ 6 0
11 NAME NGC 1569 CL* A Cl* 04 30 48.2 +64 50 59   15.45 15.22     ~ 99 1
12 NAME NGC 1569 CL* B Cl* 04 30 49.0 +64 50 53           ~ 71 0
13 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1167 3
14 [HHG93] NGC 1569 8 PoG 04 30 50.1 +64 48 57           ~ 7 0
15 [HHG93] NGC 1569 7 PoG 04 30 50.4 +64 49 21           ~ 6 0
16 HK NGC 1569 23 HII 04 30 52.1 +64 50 48           ~ 13 0
17 [SI2002] HV6 PoC 04 30 59.6 +64 49 44           ~ 1 0
18 [SI2002] HV7 PoC 04 31 06.2 +64 49 14           ~ 1 0
19 NAME NGC 1569 HI Bridge HI 04 31 17 +64 47.3           ~ 6 0
20 UGCA 92 G 04 32 04.9 +63 36 49   16.15       ~ 117 0
21 NAME NGC 1569-HI HI 04 32 09 +64 49.4           ~ 8 1
22 [M98b] NGC 1569-B sh ~ ~           ~ 4 0
23 [M98b] NGC 1569-G sh ~ ~           ~ 4 0
24 [HHG93] NGC 1569 6 PoG ~ ~           ~ 6 1

    Equat.    Gal    SGal    Ecl

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