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M. Hancock, D. Weistrop (UNLV), M. E. Kaiser (JHU)
We have obtained STIS longslit spectra of the central region of the advanced merger NGC 4194. The spectra cover the wavelength range 1150-1750 angstroms in the FUV and 2900-10270 angstroms in the visible. Results from the study of the properties of 14 star forming regions (knots) are presented. We determine the average E(B-V)=0.98 mag by comparing the Halpha+[N II] flux to the Hbeta flux. If the [N II] contribution is 40% then the average E(B-V)=0.50 mag. The presence of strong stellar winds, indicated by blue shifted FUV absorption lines, and the absence of emission lines lead us to believe that knot 6 is a bubble. The combined Halpha+[N II] luminosity of the 14 knots yield a total SFR of ~6 solar masses per year and the combined [O II] luminosity of those knots yield a total SFR of ~8 solar masses per year. Using Starburst99, and the EW(Halpha+[N II]) and EW(Hbeta), we estimate the ages of the star forming regions to be ~6-11 Myr. The sizes of the knots were determined from L(Hbeta) and range from ~7 pc to ~22 pc when a filling factor of 1 is assumed. The sizes are a factor of ~2.15 larger for a filling factor of 0.1.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.