A UV through IR Look at Star Formation and Super Star Clusters in Two Circumnuclear Starburst Rings

Details A UV through IR Look at Star Formation and Super Star Clusters in Two Circumnuclear Starburst Rings A UV through IR Look at Star Formation and Super Star Clusters in Two Circumnuclear Starburst Rings

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.7802m&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #78.02; Bulletin of the American Astronomical Society, Vol. 32, p.1529

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present broad-band (U, V, I, and H) and narrow-band (Hα +[N II] and Paα ) images of the circumnuclear starburst rings in two nearby spiral galaxies, NGC 1512 and NGC 5248, obtained with the WFPC2 and NICMOS cameras on HST. Combined with previously published HST images at 2300 Å, these data provide a particularly wide wavelength range with which to study the properties of the stellar populations, the gas, and the dust in the rings. We examine the morphology, the line emission, the ionizing photon budget, and the extinction of the gas in the H II regions. We identify the major (about 500 in each galaxy) compact continuum sources (super star clusters and individual stars), measure their spectral energy distributions from 0.2 μ m to 1.6 μ m, and compare them to spectral synthesis models to determine ages and extinctions. Most of the luminous sources (MV≈ -10 to -12 mag) are super star clusters that are blue, a few million years old, and not highly reddened. The starburst in each ring thus appears be a brief and well-synchronized event.

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