Bibcode
Stanga, R. M.; Maiolino, R.; Rodríguez Espinosa, J. M.
Referencia bibliográfica
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 319 (SEE N93-26706 10-90)
Fecha de publicación:
1
1993
Número de citas
0
Número de citas referidas
0
Descripción
The galaxy NGC 5506 hosts an active nucleus, that presents
characteristics that are intermediate between Sy1 and Sy2. We discuss
long slit spectra of NGC 5506 in the ranges 4675-5475 A and 6300-7125 A,
that were obtained at three different position angles, in Apr. 1991 at
the WHT 4.2 m telescope. The peculiar kinematics of the emitting gas has
already been observed by other researchers; following the model proposed
by the other researchers, that the emitting gas is located in two cones,
we determined the aperture of the cones. The data, moreover, support the
hypothesis that the gas is receding from the nucleus. We modelled the
intensity and the ratios of the emission lines, and verified that the
active nucleus of NGC 5506 can be described as a Sy1 nucleus, with the
UV-X source that is partially obscured to our line of sight. On the
contrary, a good fraction of the interstellar gas of the galaxy is
directly illuminated and photoionized by the central source. Our data
show evidence of star formation close to the nucleus; we estimated the
star formation rate, that is high with respect to 'normal' spirals, but
not high enough to be comparable to star formation rates in a starburst
galaxy.