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

Yoshiaki Sofue | Zendy

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

Author(s) -

Yoshiaki Sofue

Publication year - 1998

Publication title -

publications of the astronomical society of japan

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.99

H-Index - 110

eISSN - 2053-051X

pISSN - 0004-6264

DOI - 10.1093/pasj/50.2.227

Subject(s) - bulge , physics , astrophysics , galaxy rotation curve , galaxy , spiral galaxy , astronomy , barred spiral galaxy , radius , interacting galaxy , tidal force , dwarf galaxy , galaxy formation and evolution , computer security , computer science

The rotation curve of the small-mass starburst galaxy M82 has a steep nuclearrise, peaking at 200 pc radius, and then, declines in a Keplerian fashion. Thisrotation curve mimics that for a central bulge of spiral galaxies with highconcentration of stellar mass. The declining rotation indicates that itsextended disk mass is missing. In order to explain this peculiar rotationcharacteristics, we propose a hypothesis that M82 is a surviving central bulgeof a much larger disk galaxy, whose outer disk was truncated during a closeencounter with M81. We simulate a tidal truncation of the disk of a companiongalaxy by a tidal penetration through its more massive parent galaxy. The modelcan well reproduce the observed peculiar feature of M82.Comment: PASJ in pres

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