For refcode 1999AJ....117..111H: Retrieve 19 NED objects in this reference. Please click here for ADS abstract
NED Abstract
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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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