Unveiling the massive star content in the prototypical nuclear starburst NGC7714

Computer Science

Scientific paper

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Hst Proposal Id #6672 Galaxies &Amp, Clusters

Scientific paper

We propose ultraviolet spectroscopy with GHRS+G140L and UV WFPC2{F380W} imaging of the prototypical starburst galaxy NGC 7714. The compact appearance and the brightness of the nuclear starburst, as well as the amount of multiwavelength observational data, lead us to propose this object as a laboratory to study the star formation processes in the violent nuclei of starburst galaxies. The Cycle 6 spectroscopy will allow us to derive the massive star content in the nuclear starburst of NGC 7714 directly from the signatures of the massive stars in the ultraviolet spectrum. These spectra will complete the multiwavelength body of data for this nuclear starburst. A complete evolutionary synthesis code will be used to interpret the data. These two complementary aspects {observational and theoretical} are the master keys to unveil the stellar content of star-forming regions and, in particular, to derive the age of the stellar population present in the nuclear starburst, and to constrain the slope and upper limit for the Initial Mass Function. Finally, the UV WFPC2 imaging will complete the study by permitting us to compare the locations of the UV and H-alpha {HST archive image} sources with the spatial distribution of massive stars in the nucleus and circumnuclear regions, constituting an additional observational constraint for the theoretical models.

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