HI study of the NGC 6744 system

Details HI study of the NGC 6744 system HI study of the NGC 6744 system

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasa...16...84r&link_type=abstract

Publications Astronomical Society of Australia, vol. 16, no. 1, p. 84-8

Astronomy and Astrophysics

Astronomy

1

Ngc 6744, Galaxy Kinematics, Galaxy Interactions, Spiral Galaxies

Scientific paper

We present preliminary results of our 5-configuration, 20-pointing mosaic with the Australia Telescope Compact Array of the neutral hydrogen in the nearby spiral galaxy NGC 6744. The bulk of the HI resides in a "ring" underlying the outer optical disk, with two HI spiral arms extending further out to almost 1.5 optical radii. The velocity field is fairly regular, apart from evidence for streaming motions along the HI arms, and the influence of the companion IB(s)m galaxy NGC 6744A. We associate a cloud of HI at a heliocentric velocity of 846 km per sec with another companion object, ESO 104-g44. Our attempts to construct a mass model for NGC 6744 suffer from poor resolution in the inner disk, and the uncertainty in the total HI flux of NGC 6744. We anticipate that HIPASS observations will be crucial in resolving the latter issue.

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