SDSS J143030.22–001115.1: A Misclassified Narrow-line Seyfert 1 Galaxy with Flat X-ray Spectrum

Bian, Wei-Hao; Qian, Cui,; Chao, Li-Chi

doi:10.1088/1009-9271/6/3/02

Cited by 4 publications

(2 citation statements)

References 30 publications

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“…We should exclude this kind of object in the statistics of NLS1s. For more details, please refer to Bian, Cui & Chao (2005b). It is still a question whether soft X‐ray photon indices of NLS1s found in SDSS are not too steep compared with those normally observed in NLS1s.…”

Section: Resultsmentioning

confidence: 99%

[O III] Emission Line in Narrow-line Seyfert 1 Galaxies

Bian

Yuan

Zhao

2006

Monthly Notices of the Royal Astronomical Society

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Three sets of two‐component profiles are used to simultaneously model the [O iii]λλ4959, 5007 and Hβ lines for the Fe ii‐subtracted spectra of 149 narrow‐line Seyfert 1 galaxies (NLS1s) from the Sloan Digital Sky Survey (SDSS). Using the linewidth of the narrow/core component of [O iii]λ5007 to trace the stellar velocity dispersion instead of using the total linewidth of [O iii]λ5007, we found that the SDSS NLS1s are still deviated from the Mbh−σ relation found in the nearby inactive galaxies. This suggests that the linewidth of the [O iii] narrow/core component is likely not a good tracer of bulge velocity dispersion in NLS1s, since some other studies indicate that NLS1s, like other active galactic nuclei (AGN), should follow the Mbh−σ relation. If we assume that the [O iii]5007/Hβn line ratio emitted in the narrow‐line region (NLR) ranges from one to 10, 63 objects are found to be satisfied with this criterion, and their Hβ broad components should be used to calculate their virial black hole masses. These 63 objects are statically consistent with the Mbh−σ[O III] relation. With the Chandra observation of some SDSS NLS1s, we find that one of these 63 objects (J143030.22‐001115.1) cannot be classified as a genuine NLS1. Its narrow component of Hβ is coming from NLRs. This is consistent with its very flat hard X‐ray spectrum found by researchers.

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Section: Resultsmentioning

confidence: 99%

[O III] Emission Line in Narrow-line Seyfert 1 Galaxies

Bian

Yuan

Zhao

2006

Monthly Notices of the Royal Astronomical Society

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“…However, it is worth noting that the Gaussian analysis shows a broad Hb component [FWHM(Hb) p 2630 km s Ϫ1 ] that is significantly wider than the nominal NLS1 limit [FWHM(Hb) p 2000 km s Ϫ1 ]. Separating the Balmer lines into a broad and a narrow component has led to a revision of the quality of several objects that were previously misclassified as NLS1's (e.g., Ve ´ron-Cetty et al 2001;Botte et al 2005;Bian et al 2006aBian et al , 2006b. These misclassifications were in part favored by the original definition of NLS1, which did not take into consideration the impact of a varying mix of the broad-and narrow-line components (Osterbrock & Pogge 1985;Goodrich 1989).…”

Section: Sbs 1118ϩ541mentioning

confidence: 99%

Physical Parameters and Classification of Eight Galactic Nuclei from the Second Byurakan Survey

Diego¹

2007

PUBL ASTRON SOC PAC

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Accurate spectral parameters estimates are essential to investigate the physical conditions in AGNs. Particularly, intrinsic reddening can be estimated from the Hα/Hβ ratio of the narrow line components. The mass of the central black hole can be obtained from the stellar velocity dispersion in the bulge, which can be estimated from the [O III] λ5007 width, or by the relation between the AGN luminosity and the width of the broad Hβ component. Two different luminosity values are important: one derived from the monochromatic 5100Å, and the integrated luminosity for the broad component of Hβ. The spectral parameters are also a fundamental key to obtain a reliable classification. Spectroscopic observations with a resolution of 4.5Å were performed for a sample of eight galactic nuclei extracted from the Second Byurakan Survey, and one companion galaxy of SBS 1204+505B. The EW and FWHM of the emission lines were measured, and useful line ratios and diagnostic diagrams were used for object classification and reddening estimates. Intrinsic reddening quantities were calculated for all non QSO, i.e. seven objects. Particularly the amount of reddening, B −V color excess, extinction coefficient and optical depths in the V band, at Hα and Hβ wavelengths, and at 5100Å. The broad line region size was also estimated for seven objects, as well as the central black hole masses. Three mass estimates were usually performed for each object and compared. A peculiar line, probably He I λ5048, is detected in the QSO SBS 1626+554. Evidence for a stratified narrow line region is found for the two narrow line Seyfert 1 galaxies included in the sample. A revised classification is proposed for two objects, and the companion galaxy of SBS 1204+505B is reported as a nuclear starburst galaxy.

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XMM-NEWTONOBSERVATIONS OF SDSS J143030.22 – 001115.1: AN UNUSUALLY FLAT-SPECTRUM ACTIVE GALACTIC NUCLEUS

Mathur¹,

Golowacz²,

Williams³

et al. 2009

The Astronomical Journal

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We present XMM-Newton observations of the type 1 active galactic nucleus (AGN) SDSS 1430−0011 (z = 0.1032). The low signal-to-noise ratio spectrum of this source obtained in a snap shot Chandra observation showed an unusually flat continuum. With the follow-up XMM-Newton observations, we find that the source spectrum is complex; it either has an ionized absorber or a partially covering absorber. The underlying power law is in the normal range observed for AGNs. The low flux of the source during Chandra observations can be understood in terms of variations in the absorber properties. The X-ray and optical properties of this source are such that it cannot be securely classified as either a narrow-line Seyfert 1 or a broad-line Seyfert 1 galaxy, adding to the group of sources in the "in-between" class.

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SDSS J143030.22–001115.1: A Misclassified Narrow-line Seyfert 1 Galaxy with Flat X-ray Spectrum

Cited by 4 publications

References 30 publications

[O III] Emission Line in Narrow-line Seyfert 1 Galaxies

[O III] Emission Line in Narrow-line Seyfert 1 Galaxies

Physical Parameters and Classification of Eight Galactic Nuclei from the Second Byurakan Survey

XMM-NEWTONOBSERVATIONS OF SDSS J143030.22 – 001115.1: AN UNUSUALLY FLAT-SPECTRUM ACTIVE GALACTIC NUCLEUS

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