Query : 2000A&A...356L..49S

2000A&A...356L..49S - Astronomy and Astrophysics, volume 356, L49-52 (2000/4-2)

The vertical extent and kinematics of the HI in NGC 2403.


Abstract (from CDS):

The neutral hydrogen line profiles along the major axis of the nearby spiral galaxy NGC 2403 show a wing towards the systemic velocity. This asymmetry can be explained with the presence of an abnormally thick HI disk (FWHM∼5kpc) or with a two-component structure: a thin disk and a slowly rotating, thicker (1-3kpc) HI layer. The latter model gives a better representation of the observations. These results throw a new light on the disk-halo connection in spiral galaxies. In particular, the decrease of rotational velocity with height above the plane may be the result of a galactic fountain flow. A vertically extended, slowly rotating HI layer may be common among spiral galaxies with high levels of star formation.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 2403 - galaxies: kinematics and dynamics - galaxies: structure

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1593 2
2 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1697 1

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