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NGC 7130
The NGC 7130 K band shows an inner bar oriented at P.A.=0o not
visible at optical wavelengths (Mulchaey et al 1997). In the digital sky
survey it can be seen that NGC 7130 has two dwarf companion galaxies located
to the North-West at 50 arcsec (15.5 kpc) and to the South-West at 30 arcsec
(9 kpc). An Halpha image shows two bright arms and circumnuclear extended
emission, but the [OIII] image only shows emission concentrated in the
nucleus (Shields & Filippenko 1990). There is an extremely luminous
infrared source, with a very compact radio source (Norris et al 1990).
It was classified as a Seyfert nucleus by Phillips, Charles, & Baldwin
(1983). It shows high excitation lines, such as [NeV] 3426 and HeII 4686,
with line ratios typical of Seyfert 2 nuclei ([NeV]/Hbeta=0.78, HeII 4686/Hbeta=0.16,
[OIII]/Hbeta=6.0, [NII] 6584/Halpha=0.96 taken from Shields & Filippenko
(1990)). The IUE spectrum (through a large 10x20 arcsec aperture, equivalent
to 3.1x6.2 kpc) shows starburst characteristics mixed with emission lines
(Thuan 1984; Kinney et al 1991). This dual nature has also been shown at
optical (Shields & Filippenko 1990) and NIR wavelengths (Goldader et
al 1997). At optical wavelengths, stellar absorption underlies the Balmer
emission lines, and at 2 micron, the CO stellar absorption band is clearly
detected.
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Rosa Gonzalez
1998-06-20