Is M82 a Disk-Truncated Bulge by a Close Encouter with M81?

Sofue Yoshiaki

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Is M82 a Disk-Truncated Bulge by a Close Encouter with M81?

机译：M82与M81的近距离接触会导致磁盘被截断吗？

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Therotationcurveofthesmall-massstarburstgalaxyM82hasasteepnuclearrise,peakingat200pcradius,whichthendeclinesinaKeplerianfashion.Thisrotationcurvemimicsthatforacentralbulgeofspiralgalaxieswithahighconcentrationofstellarmass.Thedecliningrotationindicatesthatitsextendeddiskmassismissing.Inordertoexplainthispeculiarrotationcharacteristic,weproposeahypothesisthatM82isasurvivingcentralbulgeofamuchlargerdiskgalaxy,whoseouterdiskwastruncatedduringacloseencounterwithM81.Wesimulatedatidaltruncationofthediskofacompaniongalaxybyatidalpenetrationthroughitsmoremassiveparentgalaxy.ThemodelcanwellreproducetheobservedpeculiarfeatureofM82.

机译：Therotationcurveofthesmall-massstarburstgalaxyM82hasasteepnuclearrise，peakingat200pcradius，whichthendeclinesinaKeplerianfashion.Thisrotationcurvemimicsthatforacentralbulgeofspiralgalaxieswithahighconcentrationofstellarmass.Thedecliningrotationindicatesthatitsextendeddiskmassismissing.Inordertoexplainthispeculiarrotationcharacteristic，weproposeahypothesisthatM82isasurvivingcentralbulgeofamuchlargerdiskgalaxy，whoseouterdiskwastruncatedduringacloseencounterwithM81.Wesimulatedatidaltruncationofthediskofacompaniongalaxybyatidalpenetrationthroughitsmoremassiveparentgalaxy.ThemodelcanwellreproducetheobservedpeculiarfeatureofM82。

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《PASJ: Publications of the Astronomical Society of Japan》 |1998年第2期|共页
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Sofue Yoshiaki;
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Is M82 a Disk-Truncated Bulge by a Close Encouter with M81?

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