Starburst or Seyfert? Using Near-Infrared Spectroscopy to Measure the Activity in Composite Galaxies
Open Access
- 1 January 1999
- journal article
- research article
- Published by American Astronomical Society in The Astronomical Journal
- Vol. 117 (1) , 111-125
- https://doi.org/10.1086/300666
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 an 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.Keywords
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