NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-02-23 T13:55:59 PST
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For refcode 1999AJ....117..111H:
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1999AJ....117..111H STARBURST OR SEYFERT? USING NEAR-INFRARED SPECTROSCOPY TO MEASURE THE ACTIVITY IN COMPOSITE GALAXIES TANYA L. HILL School of Physics, University of Sydney, NSW, 2006, Australia CHARLENE A. HEISLER Mount Stromlo and Siding Spring Observatories, Institute of Advanced Studies, The Australian National University, Private Bag, Weston Creek Post Office, Canberra, ACT, 2611, Australia RALPH SUTHERLAND Australian National University Astrophysical Theory Centre; and Mount Stromlo and Siding Spring Observatories, Institute of Advanced Studies, The Australian National University, Private Bag, Weston Creek Post Office, Canberra, ACT, 2611, Australia AND RICHARD W. HUNSTEAD School of Physics, University of Sydney, NSW, 2006, Australia Received 1998 March 23; accepted 1998 October 7 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. Key words: galaxies: active-galaxies: Seyfert-galaxies: starburst
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