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The Many Vortexes of NGC 5236 Nucleus in The Central 80×200 Parsecs

Published online by Cambridge University Press:  01 August 2006

R. Diaz ,
I. Rodrigues ,
H. Dottori ,
D. Mast  and
M. P. Agüero
R. Diaz
Affiliation:
Gemini Observatory, Southern Operations Center, Chile. CASLEO, CONICET, Argentina. e-mail:[email protected]
I. Rodrigues
Affiliation:
Instituto de Física, UFRGS, cp: 15051, cep: 91501-970, Porto Alegre, Brazil email: [email protected]
H. Dottori
Affiliation:
Instituto de Física, UFRGS, cp: 15051, cep: 91501-970, Porto Alegre, Brazil email: [email protected]
D. Mast
Affiliation:
Observatório Astronómico de Córdoba, Laprida 854, Córdoba, Argentina
M. P. Agüero
Affiliation:
Observatório Astronómico de Córdoba, Laprida 854, Córdoba, Argentina
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Abstract

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GEMINI-S+CIRPASS configuration has been used to obtain 490 high quality spectra, centred in 1.3 microns of the NW-SE oriented, central 80 × 200 pc of NGC 5236 (M83), with spectral resolution of 3200. We determine the kinematics of this region with 0.36 arcsec sampling, sub-arcsec resolution. Disk-like motions are detected in Paβ at parsec scales around: a) the optical nucleus (ON), b) the dynamical centre of the CO velocity map (Sakamoto et al 2004) coincident with the K–band center (hereafter KC; Thatte et al. 2000), located 50 pc to the W of the optical nucleus, and c) the hidden condensation (hereafter HN; Mast et al. 2006), now more precisely located at 120 pc to the N-NW of the optical nucleus. The disk around ON has a radius of 10–15 pc and those around KC and HN can be traced approximately up to 40-50 pc from their kinematical centres. Rotation curve fittings using Satoh like spheroids give masses of 2–4×106M⊙, 10–15×106M⊙ and 15–20×106M⊙ respectively. N-body simulations using Gadget2 (Springel, 2005) show that ON, KC and HN will merge in 20-50 Myrs. A question that arise immediately is if this degree of dynamical activity is peculiar of M83 or it is a common behaviour, seen in this galaxy in all its dramaticity due to its small distance from us.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 93
Copyright
Copyright © International Astronomical Union 2007

References

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