Kinematics and morphology of ionized gas in Hickson Compact Group 18

Details Kinematics and morphology of ionized gas in Hickson Compact Group 18 Kinematics and morphology of ionized gas in Hickson Compact Group 18

2000-04-26

arxiv.org/abs/astro-ph/0004358v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in Astronomical Journal (13p 6 figures)

Scientific paper

10.1086/301506

We present new observations of $H\alpha $ emission in the Hickson Compact Group 18 (HCG 18) obtained with a scanning Fabry-Perot interferometer. The velocity field does not show motions of individual group members but, instead, a complex common velocity field for the whole group. The gas distribution is very asymmetric with clumps of maximum intensity coinciding with the optically brightest knots. Comparing $H\alpha $ and HI data we conclude that HCG 18 is not a compact group but instead a large irregular galaxy with several clumps of star formation.

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