The Starburst-ISM Interaction in NGC 1569

Details The Starburst-ISM Interaction in NGC 1569 The Starburst-ISM Interaction in NGC 1569

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8133s&link_type=abstract

HST Proposal ID #8133

Computer Science

Hst Proposal Id #8133 Interstellar And Intergalactic Matter

Scientific paper

We propose to use the WFPC2 camera to obtain narrowband images of the complex ionized gas component of the dwarf starburst galaxy NGC 1569. We will image the central regions of the galaxy in the emission lines of H-alpha, H-beta, [S II] 6717A+6731A, [O III] 5007A, and He II 4686A. The H-alpha imagery will provide a map of the optical emission associated with the filamentary ionized gas, at much higher resolution than ever before studied. From recent ground-based imagery and Fabry-Perot observations with 1"-2" resolution, we expect the increased resolution of HST to reveal immense detail in the filament system, allowing for accurate isolation of the filamentary structure from the background, as well as detailed comparison of the ionized gas and stellar components. {The latter has already been imaged in detail by HST/WFPC2.} The [SII] and [OIII] imagery will provide high-resolution maps of the filament excitation, leading to improved models of the outflow emission mechanis ms and energetics. The H-beta image will be used to create a map of the extinction, an important issue in the inner regions of starburst systems, and in NGC 1569 particularly. Finally, the He II image will be used to separate regions under the influence of Wolf-Rayet stars from those interacting with O stars, again allowing for more accurate models.

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