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• W2104192962 abstract "The optical spectrum of SDSS J022119.84 + 005628.4 (RA = 02h 21m 19.84s, Dec = 00° 56' 28.4'', J2000; z = 0.399785 ± 0.000558) is analyzed by multi-component profile modelling. The small flux ratio of [O III]NC/Hβ (= 0.78) and FWHM(HβBC) = 1778.1 ± 85.9 km s−1 led us to identify SDSS J022119.84 + 005628.4 as a Narrow-line Seyfert 1 galaxy with RFe = 1.4+1.0−1.0 and intermediate radio loudness, log R = 1.93. The continuum low jump at the Balmer limit might be contributed by a starburst component, which suggests that the object is a relatively young AGN with star-formation activity in its inner region. This provides a useful observational test of the AGN evolution. The low flux ratio of the narrow components, [O III]/Hβ = 1.62, and the prominent [O II]λ3727 emission, [O II]/[O III] = 2.24, suggests that there should be a group of AGNs different from Seyfert 2s when their broad line regions are obscured by the torus on the line of sight. A possible orientation effect is suggested to interpret the observed Seyfert 1.5s-like spectrum of the object. The spectrum features prominent broad blue wings of both [O III] λλ4959 and 5007. After excluding other possible contributions, we conclude that the broad components are emitted by [O III] itself. The material emitting the broad [O III] line is probably situated in a transient line region (with a low electron density, ne > 107 cm-3) between the broad line region (BLR) and the narrow line region (NLR). The object can be classified as a ``blue outlier'' defined by Zamanov et al., according to its velocity shift υr ([O III]) = −293.6 ± 18.0 km s−1, relative to the systematic velocity." @default.
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• W2104192962 date "2004-10-01" @default.
• W2104192962 modified "2023-09-25" @default.
• W2104192962 title "SDSS J022119.84+005628.4: A Radio-Loud Narrow-Line Seyfert 1 Galaxy with Star Formation in its Nucleus" @default.
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• W2104192962 doi "https://doi.org/10.1088/1009-9271/4/5/415" @default.
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