Other
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436..102l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-367X), vol. 436, no. 1, p. 102-111
Other
70
Absorption Spectra, Emission Spectra, Galactic Evolution, Galactic Nuclei, Infrared Radiation, Iron, Quasars, Red Shift, Astronomical Observatories, Flux Density, Infrared Photometry, Luminosity, Ultraviolet Radiation, Ultraviolet Spectroscopy
Scientific paper
In this paper we investigate the nuclear properties of the extreme IR-Fe II emitters IRAS 07598+6508 by means of UV-optical spectroscopy, and IR photometry. The features shown in the UV region (by the IUE spectrum of IRAS 07598+6508) are very similar to those obtained for high-redshift low-ionization BAL QSOs (i.e., they show a strong blend of broad absorption and emission lines with low and high state of ionization), implying outflow velocities between 4000 and 18,000 km/s. The UV continuum shows a clear deficit of UV photons at lambda less than 2000A; and only weak Fe IIUV emission was detected. On the other hand, the optical emission spectrum of IRAS 07598+6508 shows the typical features of extreme optical Fe II emitters, with Fe IIOPT/Hβ approximately 8, Na I D/Hα = 0.05, and (O III) lambda 5007/Hβ approximately 0.02 (very similar to the values obtained for Mrk 231). Finally, IR-IRAS archival data were used in order to compare the IR properties of this QSO in relation to extreme and strong IR-Fe II emitters, and we found different locations in the IR color-color diagram for these two groups of objects (i.e., the strong Fe II-IR emitters are distributed mainly in the power-law area, while the extreme emitters are located between the power-law and the blackbody region). In addition, the IR and optical properties of some galaxies showing 'optical narrow emission lines' and strong optical Fe II emission were studied. These results and the nature of extreme and strong IR-Fe II emitters (showing strong BAL systems and weak NLR) are discussed 'mainly ' in terms of a dusty starburst/superwind scenario. We suggest that IRAS 07598+6508 is probably an IR QSO where the nuclear starburst is in a more advanced state than in Mrk 231, in particular, when the gas and dust (that were obscuring the UV BLR and the UV photons) have been partially expelled by the nuclear starburst/superwind. Also, we propose that the extreme/strong Fe II emission (probably originated in the ejecta of Type II supernovae (Terlevich et al. 1994a) and/or in the associated superbubble) could be a sensible parameter in order to measure the process of cleaning the nuclear dust and therefore is probably related to the origin of the NLR mission and BAL system. Finally, an evolutionary link between extreme and strong IR-Fe II emitters is discussed.
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