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We present 3-D modelling of the distribution and kinematics of
the neutral hydrogen in the spiral galaxy ESO 123-G23. The optical appearance
of this galaxy is an almost perfectly edge-on disk, while the neutral hydrogen is found
to extend vertically out to about 15 kpc on either side of the galactic plane.
The H I layer and the major features of the H I data cube
can be successfully explained by a model dominated by a strong
(about 30°) line-of-sight warp. Other
models were tried, including a flare model and a two-component model, but they clearly
do not reproduce the data.
This is the
first unambiguous detection of a galactic warp that has the maximum deviation from the
central plane almost along the line-of-sight.
No evidence for the presence of any
companion galaxy is found in the H I data cube.
Line-of-sight warps in edge-on galaxies are probably
frequent, but escape detection as they are too weak. Moreover they may
easily be mistaken as flares or “thick disks”. A 3-D modelling of the H I
layer as the one presented here is needed in order to distinguish between
these possibilities.
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