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Astron. Astrophys. 333, 877-881 (1998)

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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

Received 8 December 1997 / Accepted 4 February 1998

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 0:0036 NE and 0:0031 SW from it, show that the nuclear region exhibits the characteristics of a Liner with exceptionally strong [O i] emission, all lines being broad (FWHM [FORMULA] 1 100 km s-1), while the gas outside the nucleus has a typical Seyfert 2 spectrum with relatively narrow lines ([FORMULA] 200-300 km s-1). 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.

Key words: galaxies: active – nuclei – galaxies: Seyfert – galaxies: individual: NGC 5252

* 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.

Send offprint requests to: A.C. Gonçalves, (e-mail: anabela@obs-hp.fr)

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© European Southern Observatory (ESO) 1998

Online publication: April 28, 1998

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