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The nuclear starburst of M83 revealed with SINFONI M83 large SAB(s)c, distance 4.5 Mpc Liesbeth Vermaas Paul van der Werf (Leiden Observatory) = optical peak × = center K-isophotes nuclear starburst - offset from optical nucleus Questions: - Double nucleus? center K-isophotes × 1. - Where is the dynamical center? Conclusions from SINFONI data: - dynamical nucleus offset from optical peak by 3″ - no mass concentration detected at dynamical nucleus - mass of optical peak ~108 M (dynamics) K-band isophotes (Thatte et al. 2000) VLT/SINFONI: near-IR 1-2.5 μm integral field spectroscopy M83: nuclear starburst 3 pointings in central 15''x15'' = 330x330 pc 8'' = 175 pc Brγ young stars K-band (super)giants H2 flux 15'' = 330 pc 2'' starburst offset! 44 pc = optical peak Gas dynamics from H2 (2.12μm) H2 velocity H2 flux × × (P,V) diagram -optical peak ( ) offset = optical peak 3'' -from dynamical nucleus (×) × = dynamical nucleus -inner-outer edge 2.5 - 5.0'' -from dynamical nucleus (×) -i=24°, PA=50° and position -adopted from CO observations -by Sakamoto et al. 2004 velocity (km/s) Ring in M83: × rotating ring position = optical peak × = dynamical nucleus Stellar dynamics from CO-absorption (2.29μm) stellar velocity [-80,80] km/s velocity dispersion σ [0,80] km/s σ: H2 NO CLEAR PEAK! × × Conclusions: - dynamical nucleus (×) offset from optical peak ( ) by 3" - no mass concentration detected at dynamical nucleus - mass of optical peak ( ) ~108 M (dynamics)