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1999MNRAS.304..654C - Mon. Not. R. Astron. Soc., 304, 654-668 (1999/April-2)
Properties of hot stars in the Wolf-Rayet galaxy NGC 5253 from ISO-SWS spectroscopy.
CROWTHER P.A., BECK S.C., WILLIS A.J., CONTI P.S., MORRIS P.W. and SUTHERLAND R.S.
Abstract (from CDS):
From our Brα flux, the 2-arcsec nucleus contains the equivalent of approximately 1000 O7 V star equivalents and the starburst there is 2–3 Myr old; the 20-arcsec core contains about 2500 O7 V star equivalents, with a representative age of ∼5 Myr. The Lyman ionizing flux of the nucleus is equivalent to that of the 30 Doradus region. These quantities are in good agreement with the observed mid-infrared dust luminosity of 7.8x108 L☉. Since this structure of hot clusters embedded in cooler emission may be common in dwarf starbursts, observing a galaxy solely with a large aperture may result in confusion. Neglecting the spatial distribution of nebular emission in NGC 5253 implies `global' stellar temperatures (or ages) of 36 kK (4.8 Myr) and 39 kK (2.9 or 4.4 Myr) from the observed [Ne III/II] and [S IV/III] line ratios, assuming log Q=8.
Abstract Copyright: 1999, Royal Astronomical Society
Journal keyword(s): stars: Wolf-Rayet - galaxies: individual: NGC 5253 - galaxies: starburst - galaxies: stellar content - infrared: galaxies
Simbad objects: 2
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