OHP Preprint No. 113 : NGC 5252
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OHP Preprint No. 113 : NGC5252
NGC 5252 -- a Liner undercover*
A.C.Gonçalves, P.Véron and M.-P.Véron-Cetty
Observatoire de Haute-Provence (CNRS)
F-04870 Saint Michel l'Observatoire, France
e-mail : anabela@obs-hp.fr
Astronomy & Astrophysics - Received : 8 December 1997 / Accepted 4 February 1998
*Based on observations collected at the Observatoire de Haute-Provence
(CNRS, France) and Hubble Space Telescope data obtained from the Space
Telescope European Coordinating Facility (ST-ECF) Archive.
Abstract
Ground based long slit spectroscopic observations of the nuclear region of
NGC 5252, and Hubble Space Telescope (HST) Faint Object
Spectrograph (FOS) spectra of the nucleus and two bright knots located
0.36" NE and 0.31" SW from it, show that the nuclear region
exhibits the characteristics of a Liner with exceptionally strong
[OI] emission, all lines being broad (FWHM ~ 1100 km/s),
while the gas outside the nucleus has a typical Seyfert 2 spectrum with
relatively narrow lines (~200-300 km/s). We suggest that all the
emitting gas is photoionized by the hidden non-thermal nuclear source
detected through near-infrared (Kotilainen & Prieto 1995) and X-ray (Cappi
et al. 1996) observations, the ionizing continuum, in the case of the
central Liner, being "filtered" by a matter-bounded highly ionized cloud,
hidden from our view by the same material obscuring the central continuum
source.
keywords : Galaxies: active - Galaxies: nuclei - Galaxies: Seyfert -
Galaxies: individual: NGC 5252
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