A Broad Search for Counterrotating Gas and Stars: Evidence for Mergers and Accretion

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dc.creatorKannappan, S. J.
dc.creatorFabricant, D. G.
dc.date2000-09-15
dc.date.accessioned2026-07-07T11:07:57Z
dc.date.available2026-07-07T11:07:57Z
dc.descriptionWe measure the frequency of bulk gas-stellar counterrotation in a sample of 67 galaxies drawn from the Nearby Field Galaxy Survey, a broadly representative survey of the local galaxy population down to M_B-15. We detect 4 counterrotators among 17 E/S0's with extended gas emission (24% +8 -6). In contrast, we find no clear examples of bulk counterrotation among 38 Sa-Sbc spirals, although one Sa does show peculiar gas kinematics. This result implies that, at 95% confidence, no more than 8% of Sa-Sbc spirals are bulk counterrotators. Among types Sc and later, we identify only one possible counterrotator, a Magellanic irregular. We use these results together with the physical properties of the counterrotators to constrain possible origins for this phenomenon.
dc.description19 pages, 4 figures, AJ, accepted
dc.identifierhttps://arxiv.org/abs/astro-ph/0009234
dc.identifierhttp://arxiv.org/abs/astro-ph/0009234
dc.identifierAstron.J.121:140-147,2001
dc.identifierdoi:10.1086/318027
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189980
dc.subjectAstrophysics
dc.titleA Broad Search for Counterrotating Gas and Stars: Evidence for Mergers and Accretion
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