Evolutionary Implications from SDSS J085338.27+033246.1: A Spectacular Narrow-Line Seyfert 1 Galaxy with Young Poststarburst

摘要: We analyze the physical properties of poststarburst active galactic nucleus (AGN) SDSS J085338.27+033246.1 according to its optical spectrum and discuss implications on AGNs' evolution. The spectra principal component analysis (PCA) method is developed extract emission lines absorption features from total light spectrum. emission-line indicates that object can be classified as a narrow-line Seyfert 1 galaxy with Fe /HβB = 2.4 ± 0.2, large Eddington ratio (~0.34), small black hole mass (~1.1 × 107 M☉), intermediately strong radio emission. A simple single stellar population model are rather well reproduced by ~100 Myr old starburst ~7 109 M☉. However, current star formation rate, ~3.0 M☉ yr-1, inferred [O II] much smaller than past average ~70 yr-1. line diagnosis using Baldwin-Phillips-Terlevich (BPT) diagrams narrow almost entirely emitted H II regions. further possible evolutionary path links AGN phenomena.