The continuum of type 1 Seyfert galaxies. I - A single form modified by the effects of dust

Ward, M. J.; Elvis, M.; Fabbiano, G.; Carleton, N. P.; Willner, S. P.; Lawrence, Andy

doi:10.1086/165115

Cited by 141 publications

(149 citation statements)

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“…Notwithstanding the "" type 1 ÏÏ classiÐcation of our objects, the featureless continuum may be subject to nonnegligible extinction. From their study of a hard X-rayÈ selected sample of Seyfert 1 galaxies, Ward et al (1987) argue that visual extinctions of D1È3 mag are not uncommon. On the other hand, the conclusions of Ward et al (1987) cannot be readily generalized to our optically selected sample, which may be biased toward less obscured sources.…”

Section: Error Estimatesmentioning

confidence: 99%

“…From their study of a hard X-rayÈ selected sample of Seyfert 1 galaxies, Ward et al (1987) argue that visual extinctions of D1È3 mag are not uncommon. On the other hand, the conclusions of Ward et al (1987) cannot be readily generalized to our optically selected sample, which may be biased toward less obscured sources. Winkler (1997) obtains mag for the major-A V [ 1 ity of a heterogeneous sample of 92 Seyfert 1 galaxies.…”

Section: Error Estimatesmentioning

confidence: 99%

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Nuclear Luminosities and Radio Loudness of Seyfert Nuclei

Peng

2001

ApJ

220

265

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Historically, Seyfert nuclei have been considered to be radio-quiet active galactic nuclei (AGNs). We question this widely held assumption by showing that the distribution of the radio-to-optical luminosity ratio, when properly measured for the nuclear component, places the majority of R 4 L l (6 cm)/L l (B), type 1 Seyfert nuclei in the category of radio-loud AGNs, deÐned here as objects with R º 10. This result is further strengthened by strong correlations found between radio power and optical continuum and emission-line luminosities, as has been established previously for more powerful AGNs. We also present a new calibration of the relation between optical continuum and Balmer emission-line luminosities valid in the regime of low-luminosity AGNs.

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Section: Error Estimatesmentioning

confidence: 99%

Section: Error Estimatesmentioning

confidence: 99%

Nuclear Luminosities and Radio Loudness of Seyfert Nuclei

Peng

2001

ApJ

220

265

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“…Much effort has therefore been directed at researching AGN through studies of their SEDs, both by acquiring better quality data, and developing increasingly advanced SED models (e.g. Ward et al 1987;Elvis et al 1994;Vasudevan & Fabian 2009;Jin et al 2012a;Netzer & Trakhtenbrot 2014).…”

Section: Introductionmentioning

confidence: 99%

Reaching the peak of the quasar spectral energy distribution – II. Exploring the accretion disc, dusty torus and host galaxy

Collinson

Ward

Landt

et al. 2016

Mon. Not. R. Astron. Soc.

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“…Interpreting the quasar spectral energy distribution (SED) remains a challenge in astrophysics, although the last few decades have seen significant advances in the field (e.g. Ward et al 1987;Elvis et al 1994;Vasudevan & Fabian 2007). It is now widely accepted that accretion of gas on to a central supermassive black hole (SMBH) is the ultimate source powering these extremely luminous objects.…”

Section: Introductionmentioning

confidence: 99%

Reaching the peak of the quasar spectral energy distribution – I. Observations and models

Collinson

Ward

Done

et al. 2015

Monthly Notices of the Royal Astronomical Society

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We perform a spectral analysis of a sample of 11 medium redshift (1.5 z 2.2) quasars. Our sample all have optical spectra from the SDSS, infrared spectra from GNIRS and TSPEC, and X-ray spectra from XMM-Newton. We first analyse the Balmer broad emission line profiles which are shifted into the IR spectra to constrain black hole masses. Then we fit an energy-conserving, three component accretion model of the broadband spectral energy distribution (SED) to our multiwavelength data. Five out of the 11 quasars show evidence of an SED peak, allowing us to constrain their bolometric luminosity from these models and estimate their mass accretion rates. Based on our limited sample, we suggest that estimating bolometric luminosities from L 5100 Å and L 2−10 keV may be unreliable, as has been also noted for a low-redshift, X-ray selected AGN sample.

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The continuum of type 1 Seyfert galaxies. I - A single form modified by the effects of dust

Cited by 141 publications

References 0 publications

Nuclear Luminosities and Radio Loudness of Seyfert Nuclei

Nuclear Luminosities and Radio Loudness of Seyfert Nuclei

Reaching the peak of the quasar spectral energy distribution – II. Exploring the accretion disc, dusty torus and host galaxy

Reaching the peak of the quasar spectral energy distribution – I. Observations and models

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