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UNDERSTANDING AGN-HOST CONNECTION IN PARTIALLY OBSCURED ACTIVE GALACTIC NUCLEI. III. PROPERTIES OF ROSAT-SELECTED SDSS ACTIVE GALACTIC NUCLEI
Wang, J.; Wei, J. Y.
2010-08-20
Source PublicationASTROPHYSICAL JOURNAL
Volume719Issue:2Pages:1157-1167
AbstractAs the third paper of our series of studies that aim at examining the AGN-host co-evolution by using partially obscured active galactic nuclei (AGNs), we extend the broad-line composite galaxies (composite AGNs) into ROSAT-selected Seyfert 1.8/1.9 galaxies based upon the ROSAT All Sky Survey/Sloan Digital Sky Survey Data Release 5 (SDSS-DR5) catalog given by Anderson et al. The SDSS spectra of a total of 92 objects are analyzed by the same method used in our previous studies, after requiring the signal-to-noise ratio in the SDSS r' band to be larger than 20. Combining the ROSAT-selected Seyfert galaxies with the composite AGNs reinforces the tight correlation between the line ratio [O I]/H alpha versus D(n)(4000), and establishes a new tight correlation between [S II]/H alpha versus D(n)(4000). Both correlations suggest that the two line ratios are plausible age indicators of the circumnuclear stellar population for typical Type I AGNs in which the stellar populations are difficult to derive from their optical spectra. The ROSAT-selected Seyfert galaxies show that the two correlations depend on the soft X-ray spectral slope alpha(X), which is roughly estimated from the hardness ratios by requiring that the X-ray count rates within 0.1-2.4 keV be larger than 0.02 counts s(-1). However, we fail to establish a relationship between alpha(X) and D(n)(4000), which is likely caused by the relatively large uncertainties of both the parameters (especially for alpha(X) because of the AGN intrinsic obscuration). The previously established L/L(Edd)-D(n)(4000) evolutionary sequence is reinforced again by the extension to the ROSAT-selected Seyfert galaxies. These X-ray-selected Seyfert galaxies are, however, biased against the two ends of the sequence, which implies that the X-ray Seyfert galaxies present a population at a middle evolutionary stage.
KeywordGalaxies: Active Galaxies: Evolution Galaxies: Nuclei
DOI10.1088/0004-637X/719/2/1157
Indexed BySCI
Language英语
WOS IDWOS:000280658000013
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8076
Collection光学天文研究部
AffiliationChinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Wang, J.,Wei, J. Y.. UNDERSTANDING AGN-HOST CONNECTION IN PARTIALLY OBSCURED ACTIVE GALACTIC NUCLEI. III. PROPERTIES OF ROSAT-SELECTED SDSS ACTIVE GALACTIC NUCLEI[J]. ASTROPHYSICAL JOURNAL,2010,719(2):1157-1167.
APA Wang, J.,&Wei, J. Y..(2010).UNDERSTANDING AGN-HOST CONNECTION IN PARTIALLY OBSCURED ACTIVE GALACTIC NUCLEI. III. PROPERTIES OF ROSAT-SELECTED SDSS ACTIVE GALACTIC NUCLEI.ASTROPHYSICAL JOURNAL,719(2),1157-1167.
MLA Wang, J.,et al."UNDERSTANDING AGN-HOST CONNECTION IN PARTIALLY OBSCURED ACTIVE GALACTIC NUCLEI. III. PROPERTIES OF ROSAT-SELECTED SDSS ACTIVE GALACTIC NUCLEI".ASTROPHYSICAL JOURNAL 719.2(2010):1157-1167.
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