A fast bar in the post-interaction galaxy NGC 1023

Debattista, Victor P orcid iconORCID: 0000-0001-7902-0116, Corsini, Enrico and Aguerri, J A L (2002) A fast bar in the post-interaction galaxy NGC 1023. Monthly Notices of the Royal Astronomical Society, 332 (1). pp. 65-67. ISSN 0035-8711

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Official URL: http://doi.org/10.1046/j.1365-8711.2002.05269.x


We measured the bar pattern speed, Vp, of the SB0 galaxy NGC 1023 using the Tremaine– Weinberg method with stellar-absorption slit spectroscopy. The morphology and kinematics of the H I gas outside NGC 1023 suggest it suffered a tidal interaction, sometime in the past, with one of its dwarf companions. At present, however, the optical disc is relaxed. If the disc had been stabilized by a massive dark matter halo and formed its bar in the interaction, then
the bar would have to be slow. We found Vp ¼ 5:0 ^ 1:8 km s21 arcsec21, so that the bar ends
near its corotation radius. It is therefore rotating rapidly and must have a maximum disc.

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