Other
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004chjaa...4..415w&link_type=abstract
Chin. J. Astron. Astrophys., Vol. 4, p. 415-426
Other
8
Galaxies: Active, Galaxies: Seyfert, Quasars: Individual (Sdss J022119.84 + 005628.4)
Scientific paper
The optical spectrum of SDSS J022119.84 + 005628.4 (RA = 02h21m19.84 s, Dec = 00°56'28".4, J2000; z=0.399785 +/- 0.000558) is analyzed by multi-component profile modelling. The small flux ratio of [OIII]NC/Hb(=0.78) and 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, , and the prominent [O II]3727 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] 4959 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, relative to the systematic velocity.
He Xiang-Tao
Wang Jing
Wei Jian-Yan
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