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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