Narrowband Imaging and Spectroscopy Close to the Nucleus of the Seyfert Galaxy NGC 7682
Abstract
The authors have investigated a recent report (Keel, 1985) of a jet-like optical feature emanating from the nucleus of NGC 7682. Deep CCD images of NGC 7682 were taken with narrowband filters centered on the redshifted wavelength of Hα+[N II] and on a nearby continuum region. The continuum-subtracted line images show no evidence of the jet feature, although numerous H II regions appear clearly, both close to the nucleus and in the extended spiral arm structure. Spectra were taken at various dispersions and position angles, including the supposed position angle of the jet. These data were used to obtain background-subtracted spectra at the precise location of the jet. No excess emission was detected above the background-galaxy contribution. The highest-resolution spectra were used to determine the redshift of the galaxy to high precision. The authors find z = 0.01718±0.00004.
- Publication:
-
The Astronomical Journal
- Pub Date:
- May 1987
- DOI:
- 10.1086/114388
- Bibcode:
- 1987AJ.....93.1054B
- Keywords:
-
- Astronomical Spectroscopy;
- Galactic Nuclei;
- Galactic Structure;
- Seyfert Galaxies;
- Forbidden Transitions;
- H Alpha Line;
- H Ii Regions;
- Luminosity;
- Plasma Jets;
- Astrophysics;
- RADIO SOURCES: GALAXIES;
- GALAXIES: SEYFERT