Probing the physics of narrow-line regions of Seyfert galaxies I. The case of NGC 5427

摘要: Context. The spectra of the extended narrow-line regions (ENLRs) Seyfert 2 galaxies probe physics central active galaxy nucleus (AGN), since they encode energy distribution ionising photons, radiative flux and radiation pressure, nuclear chemical abundances mechanical input (unseen) AGN. Aims. We aim to constrain abundance in interstellar medium ENLR by measuring gradient circum-nuclear H ii determine abundances, use these turn EUV spectral for comparison with theoretical models. Methods. have used Wide Field Spectrograph (WiFeS) on ANU 2.3 m telescope at Siding Spring observe nearby, nearly face-on, galaxy, NGC 5427. obtained integral field spectroscopy both spiral arms. observed been modelled using MAPPINGS IV photoionisation code, derive nucleus, AGN illuminating ENLR. Results. find a very high abundance, 3.0 times solar, clear evidence enhancement N He, possibly caused massive star formation (∼100 pc) disk structure. region spectrum is fit pressure dominated model an from Black – .