Direct Confirmation of Two Pattern Speeds in the Double-barred Galaxy NGC 2950 | Zendy

E. M. Corsini | Zendy; Victor P. Debattista | Zendy; J. A. L. Aguerri | Zendy

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Direct Confirmation of Two Pattern Speeds in the Double-barred Galaxy NGC 2950

Author(s) -

E. M. Corsini,

Victor P. Debattista,

J. A. L. Aguerri

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/381080

Subject(s) - physics , astrophysics , galaxy , photometry (optics) , barred spiral galaxy , primary (astronomy) , bar (unit) , kinematics , measure (data warehouse) , rotation (mathematics) , astronomy , lenticular galaxy , elliptical galaxy , geometry , stars , classical mechanics , computer science , meteorology , mathematics , database

We present surface photometry and stellar kinematics of NGC 2950, which is anearby and undisturbed SB0 galaxy hosting two nested stellar bars. We use theTremaine-Weinberg method to measure the pattern speed of the primary bar. Thisalso permits us to establish directly and for the first time that the twonested bars are rotating with different pattern speeds, and in particular thatthe rotation frequency of the secondary bar is higher than that of the primaryone.Comment: 12 pages, 4 figures. To appear in ApJ Letter

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