Wang Jing1; Wei JianYan2; He Xiangtxao1
Source Publicationchinesejournalofastronomyandastrophysics
AbstractThe optical spectrum of SDSS J022119.84 + 005628.4 (R. A. = 02^h21^m 19.84^s, Dec = 00°56′ 28.4", J2000; z = 0.399785 5= 0.000558) is analyzed bymulti-component profile modelling. The small flux ratio of O ⅢNC/Hβ (=0.78)and FWHM(HβBC) = 1778.1 5= 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 Ⅲβ/Hβ = 1.62, and the prominent O Ⅱλ3727 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 Ⅲλλ4959 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 < 10^7cm^-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 ur(O Ⅲ)= -293.6 5= 18.0 km s^-1, relative tothe systematic velocity.
Document Type期刊论文
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GB/T 7714
Wang Jing,Wei JianYan,He Xiangtxao. sdssj022119840056284aradioloudnarrowlineseyfert1galaxywithstarformationinitsnucleus[J]. chinesejournalofastronomyandastrophysics,2004,004(005):415.
APA Wang Jing,Wei JianYan,&He Xiangtxao.(2004).sdssj022119840056284aradioloudnarrowlineseyfert1galaxywithstarformationinitsnucleus.chinesejournalofastronomyandastrophysics,004(005),415.
MLA Wang Jing,et al."sdssj022119840056284aradioloudnarrowlineseyfert1galaxywithstarformationinitsnucleus".chinesejournalofastronomyandastrophysics 004.005(2004):415.
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