Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.3204h&link_type=abstract
American Astronomical Society Meeting 203, #32.04; Bulletin of the American Astronomical Society, Vol. 35, p.1255
Astronomy and Astrophysics
Astronomy
Scientific paper
A 1 - 2.48 μ m spectroscopic survey of 31 nearby IR-bright spiral galaxies shows several spectral signatures of various classes of nuclear or near-nuclear activity. A significant subgroup of Type 2 Seyfert systems (S2s) have NIR spectra dominated by H2 emission lines,probably from shocks, but in some cases without accompanying strong [FeII] 1.644/ 1.257 μ m features. The continua in many, but not all, galaxies classed as AGN in the optical rise strongly to the red in the H and K bands, filling in the strong stellar CO features. The [SiIV] λ 1.965 μ m line occurs in both Type 1 and Type 2 nuclei and is commonly accompanied by the [CaVIII] λ 2.321 μ m feature. An as-yet unidentified feature at 2.350 μ m may be present in two galaxies. Several starforming and AGN systems exhibit one or both of a pair of lines near 1.19 μ m, attributed to [PII] and [NiII]; the latter may be a tracer of SN activity, but systematics have yet to be discerned.
Douglas Laura S.
Hawarden Tim G.
Ryder Stuart D.
Takamiya Marianne Yasuko
Wright Gillian S.
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