GALSPEC: A Tool for Computing the Spectra of Star-Forming Galaxies of Low Metallicity

Details GALSPEC: A Tool for Computing the Spectra of Star-Forming Galaxies of Low Metallicity GALSPEC: A Tool for Computing the Spectra of Star-Forming Galaxies of Low Metallicity

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.7813h&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #78.13; Bulletin of the American Astronomical Society, Vol. 32, p.1531

Astronomy and Astrophysics

Astronomy

2

Scientific paper

The far-ultraviolet spectral region is rich in diagnostics of star formation in galaxies; it gives information not only about the star-forming complex, but also about the dust and circumstellar gas. We have therefore developed a tool, called GALSPEC, for computing far-UV spectra of star-forming galaxies. The user controls the process through a graphical user interface (GUI) by specifying the input parameters for the stars, dust, and gas. GALSPEC computes the integrated spectrum of a star-forming complex, given the rate of star formation, metallicity (0.2 Zsun or 0.5 Zsun), and IMF upper mass limit. To compute the integrated spectrum, GALSPEC makes use of a library of stellar spectra composed of observed spectra from HST and model spectra calculated with the TLUSTY/SYNSPEC program (Hubeny & Lanz 1995). GALSPEC then applies wavelength-dependent extinction according to Calzetti's starburst extinction law. The mechanical luminosity from massive stars and supernovae sweeps up interstellar material thereby forming an expanding shell with a central cavity. GALSPEC computes the absorption spectrum of the shell using the CLOUDSPEC program (Hubeny 2000), a combination of Ferland's CLOUDY program and SYNSPEC. This work was supported by the STIS GTO program at Goddard and by STScI grants (GO 7437, AR 7985).

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