Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233..809m&link_type=abstract
Astrophysical Journal, Part 1, vol. 233, no. 3, Nov. 1, 1979, p. 809-815.
Astronomy and Astrophysics
Astrophysics
31
Seyfert Galaxies, Spectrophotometry, X Ray Sources, Electron Density (Concentration), Electron Energy, Elliptical Galaxies, Emission Spectra, Forbidden Transitions, Line Spectra, X Ray Spectra
Scientific paper
Spectrophotometry of the nucleus of the X-ray galaxy NGC2110 shows a typical Seyfert Type 2 spectrum with a strong galactic continuum. The widths of the forbidden lines are about 360 km/s (FWHM), H-beta being somewhat broader. The moderate Balmer decrement implies that the interstellar reddening is approximately 2.1 mag. The average electron density and temperature in the line-emitting region are approximately 300 per cu cm and 35,000 K, respectively. From measurements of the nebulium line, it is found that the extent of the nucleus measured along the major axis of the galaxy is about 10 arcsec (2100 pc) and the full range of gas velocities is about 700 km/s. A direct plate is discussed which shows faint spirallike features in NGC2110, a galaxy currently classified as elliptical. NGC2110 is a member of a new class (about 5 members) of very nearby (cz less than 2500 km/s) X-ray galaxies. Bradt et al. (1978) tentatively concluded that they are Seyfert Type 2 galaxies. This conclusion is supported, and it is shown that this is not inconsistent with the narrowness (less than 500 km/s FWHM) of their emission line.
Canizares Calude R.
McClintock Jeff E.
Paradijs Jan van
Remillard Ron A.
Véron Pascal
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