The narrow-line quasar IRAS 20181 - 2244: a luminous cousin of NGC 1068?

Elizalde, F.; Steiner, J. E.

doi:10.1093/mnras/268.1.l47

Cited by 15 publications

(11 citation statements)

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“…Measurements and analysis of the Balmer and forbidden lines were recently presented in Halpern & Moran (1998). We note that our higher S/N spectrum indicates broader wings on the Balmer lines than were seen in the spectrum of Elizalde & Steiner (1994), and the Fe II emission line complexes discussed in Halpern & Moran (1998) are seen at 4500-4680Å and 5105-5395Å. Thus we concur with the classification of this object by the latter as a narrow-line Seyfert 1.…”

Section: Iras 20181-2244supporting

confidence: 89%

Spectropolarimetry of the Luminous Narrow‐Line Seyfert Galaxies IRAS 20181−2244 and IRAS 13224−3809

Kay

Magalhães

Elizalde

et al. 1999

ApJ

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We observed the narrow-line Seyfert 1 galaxies IRAS 20181-2244 and IRAS 13324-3809 with a new spectropolarimeter on the RC spectrograph at the CTIO 4m telescope. Previously it had been suggested that IRAS 20181-2244 was a Type 2 QSO and thus might contain an obscured broad-line region which could be detected by the presence of broad Balmer lines in the polarized flux. We found the object to be polarized at about 2%, and constant with wavelength, (unlike most narrow-line Seyfert 1s), but with no evidence of broad Balmer lines in polarized flux. The spectropolarimetry indicates that the scattering material is inside the BLR. IRAS 13224-3809, notable for its high variability in X-ray and UV wavelengths, has a low polarization consistent with a Galactic interstellar origin.

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Section: Iras 20181-2244supporting

confidence: 89%

Spectropolarimetry of the Luminous Narrow‐Line Seyfert Galaxies IRAS 20181−2244 and IRAS 13224−3809

Kay

Magalhães

Elizalde

et al. 1999

ApJ

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“…This yields an intrinsic luminosity for the AGN component of L AGN 1 1 ϫ 10 12 h Ϫ2 L J . This is less than that of the narrow-line object IRAS 20181Ϫ2244 (Elizalde & Steiner 1994). Therefore, it is a plausible intrinsic L AGN luminosity.…”

Section: Discussionmentioning

confidence: 78%

Spectroscopic and Morphological Evidence That IRAS FSC 10214+4724 Is a Gravitational Lens

Liu

Hege

1995

The Astrophysical Journal

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We have obtained a 0"7 FWHM H image of IRAS FSC 10214ϩ4724. This image suggests FSC 10214ϩ4724 is an arc formed by a gravitational lens located 1"25 to the north. We have also obtained a coarse spectroscopic continuum of the lensing galaxy. The location and strength of a break in the continuum suggests the 4000 Å break of an early type galaxy at a redshift of 0.42 H 0.02. A galaxy 23Љ south is found to have a very similar redshift of 0.429 H 0.002.This redshift, coupled with the observed magnitude of the lensing galaxy (H ϭ 18.45 H 0.15, in a 2Љ aperture), implies the lensing galaxy has a very plausible L* luminosity and a velocity dispersion of 210 H 20 km s Ϫ1 (q 0 ϭ 0.5, h ϭ 0.5). Such a lens would produce a faint counter-arc image 1"6 H 0"2 north of the main arc. We observe such a counter-arc in our H image, indicating that FSC 10214ϩ4724 is indeed gravitationally lensed. We find that lensing by a z ϭ 0.42, 1 210 km s Ϫ1 galaxy is a viable and probable solution to both the observed morphology and uniquely large (11 ϫ 10 14 h Ϫ2 L J ) luminosity of FSC 10214ϩ4724. The true (unlensed) nature of FSC 10214ϩ4724 is likely an ultraluminous IR galaxy of 13.7 ϫ 10 12 h Ϫ2 L J .

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“…Its Hα line has never been examined, and its Mg II line does appear to be broad (Stocke et al 1983). A more recent candidate, IRAS 20181-2244 (z = 0.185, Elizalde & Steiner 1994), selected from the ROSAT All-Sky Survey, was subsequently shown with better spectroscopy to be a I Zw 1 object (Moran et al 1996), and not even the most luminous one among 20 similar objects in that survey. The latest candidates are the ROSAT source RX J13434+0001 at z = 2.35 (Almaini et al 1995), and an ASCA source at z = 0.9 (AX J08494+4454, Ohta et al 1996), but their faintness and high redshift do not yet allow evaluation in comparable detail to that of the better studied low-redshift objects.…”

Section: Narrow-line Seyferts and Qsos As A Classmentioning

confidence: 99%

Extreme X-Ray Variability in the Narrow-Line QSO PHL 1092

Förster¹,

Halpern²

1996

ApJ

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A ROSAT observation of the narrow-line Fe II QSO PHL 1092 shows rapid variability that requires an efficiency of at least 0.13, exceeding the theoretical maximum for an accretion disk around a non-rotating black hole. Plausible explanations for this high efficiency incorporate anisotropic emission and/or accretion onto a rapidly rotating black hole, the latter recently suggested by Kwan et al. as a mechanism for generating PHL 1092's strong Fe II lines by mechanical heating in an accretion disk. The soft X-ray luminosity of PHL 1092 had also increased by a factor of 21 over the weak Einstein detection, to more than 5 × 10 46 ergs s −1 . Its photon spectral index of 4.2 is among the steepest of any AGN. These X-ray properties are characteristic of narrow-line Seyfert 1 galaxies, of which PHL 1092 is evidently a very luminous member. Narrow-line QSOs also extend a significant correlation between X-ray luminosity and X-ray spectral index which we have found among a large sample of optically-selected, narrow-line Seyfert 1 galaxies observed by ROSAT.

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The narrow-line quasar IRAS 20181 - 2244: a luminous cousin of NGC 1068?

Cited by 15 publications

References 0 publications

Spectropolarimetry of the Luminous Narrow‐Line Seyfert Galaxies IRAS 20181−2244 and IRAS 13224−3809

Spectropolarimetry of the Luminous Narrow‐Line Seyfert Galaxies IRAS 20181−2244 and IRAS 13224−3809

Spectroscopic and Morphological Evidence That IRAS FSC 10214+4724 Is a Gravitational Lens

Extreme X-Ray Variability in the Narrow-Line QSO PHL 1092

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