Abstract
view Abstract Citations (44) References (62) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Excitation Mechanism of [Fe ii] 1.644 Micron Emission in Seyfert and Starburst Galaxies Revisited Mouri, Hideaki ; Kawara, Kimiaki ; Taniguchi, Yoshiaki Abstract In a previous paper (Mouri et al. 1990), we studied the origin of [Fe II] 1.644 micron emission in galaxies with starburst nuclei (SBNs) and active galactic nuclei (AGNs), by comparing the intensity ratio of [Fe II]/Brγ with those of optical emission lines. A linear correlation was found between [Fe II]/Brγ and [O I] λ6300/Hα. Since the [O I] line is excited in partly ionized regions which are created by shocks in SBNs and by X-rays from Seyfert nuclei in AGNs, it was suggested that (1) [Fe II]/Brγ is determined by the volume ratio of partly ionized to fully ionized regions, (2) the [Fe II] emission in SBNs is powered by shocks, and (3) the [Fe Ii] emission in AGNs is due to photoionization by the nonthermal sources. However, it is also argued that [Fe II]/Brγ is controlled by the fraction of iron depleted into dust grains. Some researchers claim that the [Fe II] emission in SBNs comes from photodissociation regions situated near OB stars, while others claim that the [Fe II] emission in AGNs comes from circumnuclear starburst regions. Taking account of this situation, we reexamine the observational properties of [Fe II] in SBNs and AGNs in detail. It is concluded that (1) the grain depletion effect is unimportant to the observed [Fe II]/Brγ ratio, (2) the contribution of [Fe II] from photodissociation regions is negligible in SBNs, and (3) the [Fe II] emission in AGNs is in principle associated with the nuclear activity. Publication: The Astrophysical Journal Pub Date: March 1993 DOI: 10.1086/172419 Bibcode: 1993ApJ...406...52M Keywords: Active Galactic Nuclei; Forbidden Transitions; Metallicity; Seyfert Galaxies; Starburst Galaxies; Cosmic Dust; Iron; Molecular Excitation; Astrophysics; GALAXIES: ACTIVE; GALAXIES: SEYFERT; INFRARED: GALAXIES; LINE: FORMATION; GALAXIES: STARBURST; ISM: DUST; EXTINCTION full text sources ADS | data products SIMBAD (43) NED (33)
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