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For refcode 1998ApJS..114...59L:
Retrieve 12 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
1998ApJS..114...59L A Near-Infrared Spectroscopic Survey of LINER Galaxies J. E. LARKIN Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60537; and Palomar Observatory, California Institute of Technology AND L. ARMUS, R. A. KNOP, B. T. SOIFER, AND K. MATTHEWS Palomar Observatory, California Institute of Technology, Caltech 320-47, Pasadena, CA 91125 Received 1997 February 5; accepted 1997 July 18 ABSTRACT This paper reports the results of a near-infrared spectroscopic survey of LINER galaxies undertaken with a new infrared spectrograph at the 5 m Hale telescope. The galaxy sample includes 11 LINERs with spectra covering the [Fe II] (1.2567 micron, Pa{beta} (1.2818 micron), H_2_ [1-0 S(1), 2.1218 micron], and Br{gamma} (2.1655 micron) near-infrared emission lines and one additional galaxy with only [Fe II] and Pa{beta} line coverage. All of the LINERs with infrared line detections have strong [Fe II] and/or H_2_ emission, with about half (four of nine) having extremely high ratios (>2) of [Fe II] to Pa{beta}. The strength of the H_2_ and [Fe II] lines is well correlated with the optical [O I] line, with many LINERs having higher ratios of [Fe II]/Pa{beta}, H_2_/Br{gamma}, and [O I]/H{alpha} than other galaxy types. The LINERs with the highest [Fe II]/Pa{beta} ratios (termed "strong" [Fe II] LINERs) show evidence for recent star formation. Shocks from compact supernova remnants may enhance the [Fe II] emission in these "strong" [Fe II] LINERs. The LINERs with lower [Fe II]/Pa{beta} ratios (termed "weak" [Fe II] LINERs) are more consistent with Seyfert-like activity, including higher ionization states, some strong X-ray sources, and some broad H{alpha} detections. The [Fe II] luminosity and the [Fe II]/Pa{beta} ratio in these objects are more easily explained by hard X-ray excitation than in the "strong" [Fe II] LINERs. These "weak" [Fe II] LINERs are considered prime candidates for being low-luminosity Seyfert nuclei. Subject headings: galaxies: Seyfert-infrared: galaxies
Retrieve 12 NED objects in this reference.
Please click here for ADS abstract

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