AN OPTICAL STUDY OF THE NUCLEI OF S0 STAR-BURST GALAXIES

Abstract

Optical observations of the nuclei of 10 S0 Markarian galaxies and two non-Markarian early type galaxies have been obtained with the McDonald Observatory 2.7m telescope. The spectra of 7 Markarian galaxies show deep Balmer absorption lines and stellar-like continua. The nuclear spectra of UGC 01157, 04902, 06570, and 12618 show strong (O II), (O III), and Hβ\beta emission lines analogous to normal H II regions. None of the galaxy continua show a featureless non-thermal component or (O I) λ\lambda 6300 line emission typical of LINER activity. The continua of UGC 02093 and 07933 are similar to normal early type galaxies. Composite model spectra with decreasing birthrates, IMF exponents of 1-1, 2.5-2.5, and 4-4, and solar metallicity have been constructed from observed stellar spectra. Comparison of CaH + Hε\varepsilon to CaK absorption line flux ratios measured in 5 star-burst galaxies to single star-bust episode models implies stellar population ages greater than 5 ×\times 10\sp9 years

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oaioai:scholarship.rice.e...Last time updated on 6/11/2012

This paper was published in DSpace at Rice University.

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