SDSS J143030.22-001115.1: A misclassified narrow-line Seyfert 1 galaxy with flat X-ray spectrum

Abstract

We used multi-component profiles to model H$\beta$ and [O III]$\lambda \lambda$4959,5007 lines for SDSS J143030.22-001115.1, a narrow-line Seyfert 1 galaxy (NLS1) in a sample of 150 NLS1s candidates selected from the Sloan Digital Sky Survey (SDSS) Early Data Release (EDR). After subtracting the H$\beta$ contribution from narrow line regions (NLRs), we found that its full width half maximum (FWHM) of broad H$\beta$ line is nearly 2900 \kms, significantly larger than the customarily adopted criterion of 2000 \kms. With its weak Fe II multiples, we think that SDSS J143030.22-001115.1 can't be classified as a genuine NLS1. When we calculate the virial black hole masses of NLS1s, we should use the H$\beta$ linewidth after subtracting the H$\beta$ contribution from NLRs.

7 pages, 1 table, accepted by ChJAA

References in corpus (9)

• Estimating Black Hole Masses in Active Galaxies Using the Halpha Emission Line
• The Third Data Release of the Sloan Digital Sky Survey
• A Comparison of Stellar and Gaseous Kinematics in the Nuclei of Active Galaxies
• The M-sigma Relation in Local Active Galaxies
• Active Galactic Nuclei in the Sloan Digital Sky Survey: II. Emission-Line Luminosity Function
• Emission Line Properties of Seyfert 2 Nuclei
• Ensemble Learning Independent Component Analysis of Normal Galaxy Spectra
• Empirical modeling of the stellar spectrum of galaxies
• [O III] emission line in narrow-line Seyfert 1 galaxies

Cited by in corpus (2)

• XMM-Newton observations of SDSS J143030.22$-$001115.1: an unusually flat spectrum AGN
• Physical parameters and classification of eight galactic nuclei from the Second Byurakan Survey