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 H$\beta$ emission lines analogous to normal H II regions. None of the galaxy continua show a featureless non-thermal component or (O I) $\lambda$ 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 $-1$, $-2.5$, and $-4$, and solar metallicity have been constructed from observed stellar spectra. Comparison of CaH + H$\varepsilon$ 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.
| Identifer | oai:union.ndltd.org:RICE/oai:scholarship.rice.edu:1911/13226 |
| Date | January 1987 |
| Creators | JONES, MICHAEL R. |
| Source Sets | Rice University |
| Language | English |
| Detected Language | English |
| Type | Thesis, Text |
| Format | application/pdf |
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