Scattered broad optical lines in the polarized flux spectrum of the FR II galaxy 3C 321

Young, S.; Hough, J.; Efstathiou, A.; Wills, Beverley J.; Axon, D. J.; Bailey, Jeremy; Ward, M. J.

doi:10.1093/mnras/279.4.l72

Cited by 36 publications

(30 citation statements)

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“…The detection of polarized broad emission lines in (a still small number of) NLRGs (e.g. Antonucci 1984;Cohen et al 1999;Young et al 1996a;Ogle et al 1997) provides the most direct support of this scenario. Conversely, in low-luminosity FR I RGs obscuration is actually neither "required" nor supported observationally (Urry & Padovani 1995).…”

Section: Introductionmentioning

confidence: 93%

Probing the nuclear obscuration in radio-galaxies with near infrared imaging

Marchesini

Capetti

Celotti

2005

A&A

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Abstract. We present the first near-infrared (K -band) homogeneous observations of a complete sub-sample of the 3CR radio catalogue comprising all High Excitation Galaxies (HEGs) at z < 0.3. After showing that the surface brightness decomposition technique to measure central point-like sources is affected by significant uncertainties for the objects in the studied sample, we present a new, more accurate method based on the R − K color profile. Via this method we find a substantial nuclear K -band excess in all but two HEGs -most likely directly associated with their nuclear emission -and we measure the corresponding 2.12 µm nuclear luminosities. Within the frame-work of the unification scheme for radio-loud active galactic nuclei, it appears that obscuration alone is not able to account for the different nuclear properties of the majority of the HEGs and Broad Line Radio Galaxies (BLRGs), and also scattering of the (optically) hidden nuclear light from a compact region must be invoked. More precisely, for ∼70% of the HEGs the observed point-like optical emission is dominated by the scattered component, while in the K -band both scattered and direct light passing through the torus contribute to the observed nuclear luminosity. The estimated fraction of scattered light ranges from a few tenths to a few percent, while the torus extinction is between 15 < A V, torus < 50 mag with only a few exceptions with lower obscuration.

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Section: Introductionmentioning

confidence: 93%

Probing the nuclear obscuration in radio-galaxies with near infrared imaging

Marchesini

Capetti

Celotti

2005

A&A

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“…-detection of Polarized Broad Lines (PBL hereafter) in several Seyfert 2 galaxies (Antonucci & Miller 1985;Miller & Goodrich 1990;Tran 1995;Young et al 1996;Awaki et al 2000;Moran et al 2000;Alexander 2001;Gu et al 2001;Lumsden et al 2001), interpreted as scattering of the Broad Lines Region emission by warm material placed above an absorption torus; -large absorbing column densities observed in the hard Xray spectra of Seyfert 2 galaxies (Guainazzi et al 2001 and references therein); -suspicion of anisotropic ionization radiation from the nucleus through the structures in the light of [OIII] line at 5007 Å (e.g. in NGC 5252, Tadhunter & Tsvetanov 1989).…”

Section: Introductionmentioning

confidence: 99%

The intrinsic emission of Seyfert galaxies observed with BeppoSAX/PDS

Deluit¹,

Courvoisier²

2003

A&A

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Abstract. We present a study of the hard X-ray spectrum (>15 keV) of different classes of Seyfert galaxies observed with BeppoSAX/PDS. Using hard X-ray data, we avoid absorption effects modifying the Seyfert emission and have direct access to the central engine of these sources. The aim of this study is first to characterize the general properties of the hard X-ray spectrum of Seyfert 1, 1.5 and 2 galaxies and secondly to compare their intrinsic emission to test unified models according to which all the classes have the same nucleus. We compute the average spectrum of 14 Sy 1, 9 Sy 1.5 and 22 Sy 2 galaxies observed by the PDS (15-136 keV). The average spectrum of Sy 1 differs from that of Sy 2, the first requiring the presence of a high energy cutoff which is absent in the second. We also show that the reflection component is possibly more important in the Sy 2 emission. The nature of Sy 1.5 galaxies is ambiguous as they have a negligible reflection component (like Sy 1) and do not require a cutoff (like Sy 2).

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“…A polarized broad component of H α was discovered in this powerful FR II galaxy by Young et al (1996b). The spectrophotometric data for this object are not as good as for IRAS 1445-4343 as this object is about an order of magnitude fainter in the mid-infrared.…”

Section: C 321mentioning

confidence: 91%

ISOobservations and models of galaxies with hidden broad line regions

Efstathiou¹,

Siebenmorgen

2005

A&A

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Abstract. We present ISO mid-infrared spectrophotometry and far-infrared photometry of galaxies with Hidden Broad Line Regions (HBLR). We also present radiative transfer models of their spectral energy distributions which enable us to separate the contributions from the dusty disc of the AGN and the dusty starbursts. We find that the combination of tapered discs (discs whose thickness increases with distance from the central source in the inner part but stays constant in the outer part) and starbursts provide good fits to the data. The tapered discs dominate in the mid-infrared part of the spectrum and the starbursts in the far-infrared. After correcting the AGN luminosity for anisotropic emission we find that the ratio of the AGN luminosity to the starburst luminosity, L AGN /L sb , ranges from about unity for IRAS 14454-4343 to about 13 for IRAS 01475-0740. Our results suggest that the warm IRAS colours of HBLR are due to the relatively high L AGN /L sb . Our fits are consistent with the unified model and the idea that the infrared emission of AGN is dominated by a dusty disc in the mid-infrared and starbursts in the far-infrared.

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Scattered broad optical lines in the polarized flux spectrum of the FR II galaxy 3C 321

Cited by 36 publications

References 0 publications

Probing the nuclear obscuration in radio-galaxies with near infrared imaging

Probing the nuclear obscuration in radio-galaxies with near infrared imaging

The intrinsic emission of Seyfert galaxies observed with BeppoSAX/PDS

ISOobservations and models of galaxies with hidden broad line regions

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