2001A&A...372..463O


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.07CEST11:43:12

2001A&A...372..463O - Astronomy and Astrophysics, volume 372, 463-476 (2001/6-3)

Atomic and molecular gas in the starburst galaxy NGC 4945.

OTT M., WHITEOAK J.B., HENKEL C. and WIELEBINSKI R.

Abstract (from CDS):

Spatial and kinematical correlations between the HI and 12CO(2-1) emission of the southern spiral galaxy NGC 4945 are studied with a common angular resolution of ∼23'' (corresponding to 750pc at D=6.7Mpc) and a velocity resolution of ∼7km/s. The 1.4GHz continuum emission is also observed. The HI kinematics yield a galaxy mass of ∼1.4x1011M within radius R=380'', with molecular and neutral atomic gas each contributing ∼2%, respectively. A central continuum source of size 7.6x3.4'' (250x110pc) is enveloped by a molecular cloud of mass 1.5x109M for R≤7.5'', and is rapidly rotating with Vrot∼160km/s. HI emission from the central region at velocities |V-Vsys|>200km/s may be related to optically detected gas that is believed to trace an outflow directed towards the halo. Nuclear HI absorption at V-Vsys~+80km/s suggests inflow towards the centre, that was so far only seen in molecular lines. HI features at each end of the major axis (|R|∼600'') are interpreted as spiral arms that are viewed tangentially and that also cause prominent emission features in the radio continuum, HI, and CO further inside the galaxy. A central elongated region showing non-circular motions is interpreted as a bar which fuels the nuclear starburst. The HI and CO position-velocity data have been analysed using linear resonance theory, and possible locations of resonances are identified.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: NGC 4945 - galaxies: ISM - galaxies: spiral - galaxies: starburst - radio lines: galaxies

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10949 1
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2936 2
3 QSO B0407-65 QSO 04 08 20.37884 -65 45 09.0806     18.0     ~ 104 1
4 QSO B1215-457 QSO 12 18 06.2494001909 -46 00 28.762091040   19.59 20.3     ~ 68 1
5 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1267 2
6 [VV2006] J132304.3-445233 QSO 13 23 04.2505439851 -44 52 33.813892851     17.6     ~ 47 1

    Equat.    Gal    SGal    Ecl

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2020.08.07-11:43:12

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