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25 April 2024

» arxiv » astro-ph/9810384

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Starburst or Seyfert? Using near-infrared spectroscopy to measure the activity in composite galaxies
Tanya L. Hill ; Charlene A. Heisler ; Ralph Sutherland ; Richard W. Hunstead ;
Date:	23 Oct 1998
Subject:	astro-ph
Abstract:	We present near-infrared spectra for a sample of galaxies with ambiguous optical emission line ratios. These galaxies fall between starbursts and Seyferts in the usual optical diagnostic diagrams. We find a similar result with the near-infrared emission line ratios, which suggests that the galaxies are composite, containing both a starburst and AGN component. Furthermore, CO absorption, produced in late-type stars, is detected within the sample, although at a weaker level than is typical for starburst galaxies. We conclude that the CO feature is being diluted by a contribution from an AGN, thereby confirming the composite nature of these galaxies.
Source:	arXiv, astro-ph/9810384
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