HST Observations of the Starburst Nucleus of M83=NGC 5236

Details HST Observations of the Starburst Nucleus of M83=NGC 5236 HST Observations of the Starburst Nucleus of M83=NGC 5236

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.3104h&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #31.04; Bulletin of the American Astronomical Society, Vol. 25, p.840

Astronomy and Astrophysics

Astronomy

8

Scientific paper

We have used the Planetary Camera on HST to obtain images of the nuclear region of M83 in four filters: F336W (``U'' band), F555W (``V'' band), F785LP (``I'' band) and F658N (Hα redshifted by +504 km s(-1) ). These pictures reveal an arc of numerous OB clusters south and west of the conventional nucleus. Each of the clusters is resolved with a typical FWHM = 0.2" (4 pc). We have used the wide-band images to construct color-color diagrams and to derive absolute visual magnitudes of each of the OB star clusters. The absolute visual magnitudes range from M_v =-10.4 to M_v=-13.4, while the conventional nucleus has an M_v = -15.2. The unreddened colors indicate ages of the OB clusters from about 2 to 6 million years. The cluster masses inferred from their age and M_v range from 10(4) to 10(5) M_o for a Salpeter initial mass function. When the continuum contribution to the F658N fluxes are subtracted out, it is clear that the nucleus is not a source of Hα emission. However, intense Hα emission covers the western OB clusters. The inferred ionizing flux is about 10(50) - 10(51) photons s(-1) for individual regions, and 3x10(52) photons s(-1) for the nuclear region as a whole.

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