Starburst or Seyfert? Using near-infrared spectroscopy to measure the activity in composite galaxies

Details Starburst or Seyfert? Using near-infrared spectroscopy to measure the activity in composite galaxies Starburst or Seyfert? Using near-infrared spectroscopy to measure the activity in composite galaxies

1998-10-23

arxiv.org/abs/astro-ph/9810384v1

Astronomy and Astrophysics

Astrophysics

38 pages, 13 embedded ps figures, to appear in AJ(Jan 1999)

Scientific paper

10.1086/300666

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.

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