AAS 196th Meeting, June 2000
Session 29. Dwarf Galaxies, Galaxy Structure and Kinematics
Display, Tuesday, June 6, 2000, 10:00am-6:30pm, Empire Hall South

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[29.14] Analysis of the Spectrum of the z=2.73 Galaxy, MS1512-cB58: A Unified Model of the Stellar and Interstellar Contributions

I. Hubeny, S.R. Heap, T.M. Lanz (NASA's GSFC)

We perform a detailed analysis of the restframe far-UV spectrum of cB58 that was obtained by Pettini et al. (ApJ 528,96, 2000) using the KECK-I/LRIS. In the previous paper (AAS 195, 9.19), we modeled the spectrum of the galaxy and found that the observed spectrum is well described by a starburst model having a SMC-like metallicity and a constant star formation rate.

Here, we extend the analysis to model the total spectrum that includes stellar as well as interstellar contributions. The latter is modeled using a newly developed program CLOUDSPEC that combines the photoionization program CLOUDY (Ferland, http://www.pa.uky.edu/~gary/cloudy) with our spectrum synthesis program SYNSPEC (Hubeny & Lanz, http://tlusty.gsfc.nasa.gov). With the ionization structure of the interstellar medium given by CLOUDY, CLOUDSPEC solves the radiative transfer along the line-of-sight to the starburst and yields the profiles of the interstellar absorption lines. We show that such a ``unified'' model of the stellar + interstellar spectrum provides an excellent match to the observed spectrum of cB58.

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