A spectrophotometric study of the Seyfert 1 galaxy NGC 4253

DOI: 
Publication date: 
01/02/1996
Main author: 
Delgado, RMG
IAA authors: 
Delgado, RMG
Authors: 
Delgado, RMG; Perez, E
Journal: 
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Publication type: 
Article
Volume: 
278
Pages: 
737-748
Number: 
Abstract: 
CCD spectroscopic observations from [Ne V] lambda 3425 Angstrom to [S III] lambda 9532 Angstrom 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 H II region models with effective temperatures of 50 000 K. 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 Fe II emitter, and its spectrum shows high-excitation lines, such as [Fe VII] lambda 6086 Angstrom and [Fe X] lambda 6374 Angstrom, which are produced by photoionization in the coronal-line region, Lines produced in high-density and low-ionization conditions, such as O I lambda 8446 Angstrom and Mg II lambda 9220 Angstrom, are also detected; we show that these lines are produced by fluorescence with Ly beta. The near infrared Ca II triplet, detected in emission and in absorption, and the Fe II emission are discussed in terms of the starburst model developed by Terlevich and collaborators.
Database: 
WOK
SCOPUS
Keywords: 
line, identification; galaxies, active; galaxies, individual, NGC 4253; galaxies, nuclei; galaxies, Seyfert