The central region of M83★
R. C. W. Houghton,
N. Thatte,
Corresponding Author
R. C. W. Houghton
Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH
E-mail: [email protected]Search for more papers by this authorN. Thatte
Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH
Search for more papers by this authorR. C. W. Houghton,
N. Thatte,
Corresponding Author
R. C. W. Houghton
Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH
E-mail: [email protected]Search for more papers by this authorN. Thatte
Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH
Search for more papers by this author★
Based on observations made with ESO Telescopes at the La Silla or Paranal Observatories under programme IDs: 64.N-0100(B), 265.B-5723(A) and 65.O-0612(A). Also based on observations made with the NASA/ESA Hubble Space Telescope (HST), obtained from the data archive at the Space Telescope Science Institute (STScI). STScI is operated by the association of Universities for Research in Astronomy, Inc., under the NASA contract NAS 5-26555.
ABSTRACT
We combine VLT/ISAAC near-infrared (NIR) spectroscopy with archival HST/WFPC2 and HST/NICMOS imaging to study the central 20 × 20 arcsec2 of M83. Our NIR indices for clusters in the circumnuclear starburst region are inconsistent with simple instantaneous burst models. However, models of a single burst dispersed over a duration of 6 Myr fit the data well and provide the clearest evidence yet of an age gradient along the star-forming arc, with the youngest clusters nearest the north-east dust lane. The long-slit kinematics show no evidence to support previous claims of a second hidden mass concentration, although we do observe changes in molecular gas velocity consistent with the presence of a shock at the edge of the dust lane.
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