A spectrophotometric study of the Seyfert 1 galaxy NGC 4253

Details A spectrophotometric study of the Seyfert 1 galaxy NGC 4253 A spectrophotometric study of the Seyfert 1 galaxy NGC 4253

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.278..737g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 278, Issue 3, pp. 737-748.

Astronomy and Astrophysics

Astronomy

15

Line: Identification, Galaxies: Active, Galaxies: Individual: Ngc 4253, Galaxies: Nuclei, Galaxies: Seyfert

Scientific paper

CCD spectroscopic observations from [NeV] lambda3425A to [SIII] lambda9532A of the nucleus and circumnuclear region of the Seyfert 1 NGC 4253 are presented. The nucleus shows circumnuclear emission which is elongated 1.5 kpc to the north-east; the spectrum of this extranuclear emission is well fitted by HII region models with effective temperatures of 50000K. The kinematics of the high-excitation gas is perturbed with respect to the low-ionization gas, showing radial motions compatible with an outflow wind. The nucleus is a strong FeII emitter, and its spectrum shows high-excitation lines, such as [FeVII] lambda6086A and [FeX] lambda6374A, which are produced by photoionization in the coronal-line region. Lines produced in high-density and low-ionization conditions, such as OI lambda8446A and MgII lambda9220A, are also detected; we show that these lines are produced by fluorescence with Lybeta. The near-infrared CaII triplet, detected in emission and in absorption, and the FeII emission are discussed in terms of the starburst model developed by Terlevich and collaborators.

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