B2 0954+25A: a typical Fermi blazar or a γ-ray loud Narrow Line Seyfert 1≟

Calderone, Giorgio; Ghisellini, G.; Colpi, M.; Dotti, Massimo

doi:10.1111/j.1365-2966.2012.21456.x

Cited by 7 publications

(17 citation statements)

References 69 publications

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“…Comparing the present work to previous existing models for the two sources presented here, the scenario in which we model the sources is similar as far as the origin of the external Compton dominance is concerned: in their respective models for 2 states of 1H 0323+342 and one state of B2 0954+25A, Paliya et al (2014) and Calderone et al (2012) also describe the high energy emission from the source via the re-emission of disc and BLR photons. The disc luminosities they feature are similar to ours.…”

Section: Discussion and Outlookmentioning

confidence: 61%

“…Another interesting fact is that Calderone et al (2012) propose this source to be a transition object between FSRQs and gamma-loud NLSy1s.…”

Section: B2 0954+25amentioning

confidence: 99%

“…Further details and references are given in section 2. The main difference between our model and previous models (e.g., Calderone et al, 2012;Paliya et al, 2014) is that we consider several emission lines from the BLR (Cerruti et al, 2013b) and we describe different states of the same source by applying minimal changes to the jet parameters of the model. In the following sections, we present the multi-component model (section 2), along with the application to two datasets of each selected source (section 3) to conclude with a brief discussion and outlook (section 4).…”

Section: Introductionmentioning

confidence: 99%

“…To construct the average state, we consider archival Chandra data from 2009 from Calderone et al (2012) along with longterm averaged (3FGL, 48 months of observations) Fermi-LAT data (Acero et al, 2015). For the flaring state, we analyzed Fermi-LAT data from the flaring period of the source, i.e., Jan 2010-Jul 2010, and considered them along with Swift XRT and UVOT data from the X-ray flaring period in June 2007.…”

Section: Data Sample and Analysismentioning

confidence: 99%

“…Calderone et al (2012) give a black hole mass of M BH = 1.5 × 10 8 M ⊙ , and consider a viewing angle of θ = 3 • . As documented in the same paper, only a single flare is observed in gamma-ray frequencies during the first half FIGURE 2 | Multi-component model for the quiescent state (Top) and the flaring state (Bottom) of 1H 0323+342.…”

Section: B2 0954+25amentioning

confidence: 99%

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Modeling the Broad-Band Emission from the Gamma-Ray Emitting Narrow-Line Seyfert-1 Galaxies 1H 0323+342 and B2 0954+25A

Arrieta-Lobo

Boisson

Zech

2017

Front. Astron. Space Sci.

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Prior to the Fermi-LAT era, only two classes of Active Galactic Nuclei (AGN) were thought to harbor relativistic jets that radiate up to gamma-ray energies: blazars and radio galaxies. The detection of variable gamma-ray emission from Narrow Line Seyfert 1 (NLSy1) galaxies has put them on the spotlight as a new class of gamma-ray emitting AGN. In this respect, gamma-ray emitting NLSy1s seem to be situated between blazars (dominated by non-thermal emission) and Seyferts (accretion disc dominated). In this work, we model the Spectral Energy Distribution (SED) of two gamma-loud NLSy1s, 1H 0323+342 and B2 0954+25A, during quiescent and flaring episodes via a multi-component radiative model that features a relativistic jet and external photon fields from the torus, disc, corona and Broad Line Region (BLR). We find that the interpretation of the high-energy emission of jetted NLSy1s requires taking into account Inverse Compton emission from particles in the relativistic jet that interact with external photon fields. Minimal changes are applied to the model parameters to transition from average to flaring states. In this scenario, the observed variability is explained mainly by means of changes in the jet density and Doppler factor.

show abstract

Section: Discussion and Outlookmentioning

confidence: 61%

“…Another interesting fact is that Calderone et al (2012) propose this source to be a transition object between FSRQs and gamma-loud NLSy1s.…”

Section: B2 0954+25amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Data Sample and Analysismentioning

confidence: 99%

Section: B2 0954+25amentioning

confidence: 99%

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Modeling the Broad-Band Emission from the Gamma-Ray Emitting Narrow-Line Seyfert-1 Galaxies 1H 0323+342 and B2 0954+25A

Arrieta-Lobo

Boisson

Zech

2017

Front. Astron. Space Sci.

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Study of the orientation of narrow-line Seyfert I

Sbarrato

Dotti

Ghirlanda

et al. 2018

A&A

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We study a sample of Narrow-line Seyfert 1 galaxies (NLS1) in their optical and radio features, in order to understand the differences between their radio silent, radio-loud and radio-quiet subclasses. We first show that the different redshift and mass distributions of radio-loud and -quiet NLS1s could be ascribed to observational biases. We then present a geometrical model according to which most of the different observational features of radio-loud and radio-quiet NLS1s are ascribed to the orientation of an intrinsically structured jet. We estimate the fraction of intrinsically jetted sources among NLS1s that justifies the observed radio-detected population. Noticeably, under the assumptions of the geometrical model, we derive a fraction of jetted sources significantly larger than in standard AGN.

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Modelling the variable emission states of γ-ray-emitting narrow-line Seyfert 1 galaxies

Luashvili

Boisson

Zech

et al. 2023

Monthly Notices of the Royal Astronomical Society

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γ-ray-emitting narrow-line Seyfert 1 galaxies (γ-NLS1) constitute an intriguing small population of Active Galactic Nuclei with γ-ray emission resembling low power flat-spectrum radio quasars (FSRQ), but with differing physical properties. They are jetted, γ/radio-loud Seyfert galaxies, with relatively low black hole masses, accreting at exceptionally high, near-Eddington rates. Certain of these sources exhibit highly variable emission states on relatively short time scales, the physical origin of which remains elusive. In this work, varying emission states of two bona-fide NLS1s, 1H 0323+342 and PMN J0948+0022, and one little studied FSRQ/intermediate object, B2 0954+25A, are examined. For each source, we analyzed quasi-simultaneous multiwavelength data for different states of γ-ray activity and present the results of their broad-band emission modelling, taking into account all available physical constraints to limit the range of the model parameters. Two different scenarios are discussed, in the framework of a one-zone leptonic model, where the high energy emission is due to the inverse Compton scattering of the disc and broad line region (BLR) or torus photons by relativistic electrons within the jet. The transition from low to high state is well described by variations of the jet parameters, leaving the external photon fields unchanged. The parameterisation favours an emission scenario with particle injection on a stationary shock inside the jet. When considering all physical constraints, the disc & BLR scenario is preferred for all three sources. We use the multi-epoch modelling to characterize total jet powers and discuss the intrinsic nature of γ-NLS1 galaxies and FSRQs.

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B2 0954+25A: a typical Fermi blazar or a γ-ray loud Narrow Line Seyfert 1≟

Cited by 7 publications

References 69 publications

Modeling the Broad-Band Emission from the Gamma-Ray Emitting Narrow-Line Seyfert-1 Galaxies 1H 0323+342 and B2 0954+25A

Modeling the Broad-Band Emission from the Gamma-Ray Emitting Narrow-Line Seyfert-1 Galaxies 1H 0323+342 and B2 0954+25A

Study of the orientation of narrow-line Seyfert I

Modelling the variable emission states of γ-ray-emitting narrow-line Seyfert 1 galaxies

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