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On the black hole mass of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342

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On the black hole mass of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342

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Título On the black hole mass of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342
Autor Landt, Hermine
Ward, Martin John
Baloković, Mislav
Kynoch, Daniel
Storchi-Bergmann, Thaisa
Boisson, Catherine
Done, Chris
Schimoia, Jáderson da Silva
Stern, Daniel
Resumo Narrow-line Seyfert 1 galaxies have been identified by the Fermi Gamma-Ray Space Telescope as a rare class of γ -ray emitting active galactic nuclei. The lowest redshift candidate among them is the source 1H 0323+342. Here we present quasi-simultaneous Gemini near-infrared and Keck optical spectroscopy for it, from which we derive a black hole mass based on both the broad Balmer and Paschen emission lines. We supplement these observations with a Nuclear Spectroscopic Telescope Array X-ray spectrum taken about two years earlier, from which we constrain the black hole mass based on the short time-scale spectral variability. Our multiwavelength observations suggest a black hole mass of ∼2 × 107 M , which agrees well with previous estimates. We build the spectral energy distribution and show that it is dominated by the thermal and reprocessed emission from the accretion disc rather than the non-thermal jet component. A detailed spectral fitting with the energy-conserving accretion disc model of Done et al. constrains the Eddington ratio to L/LEdd ∼ 0.5 for a (non-rotating) Schwarzschild black hole and to L/LEdd ∼ 1 for a Kerr black hole with dimensionless spin of a = 0.8. Higher spin values and so higher Eddington ratios are excluded, since they would strongly overpredict the observed soft X-ray flux.
Contido em Monthly notices of the Royal Astronomical Society. Oxford. Vol. 464, no. 3 (Jan. 2017), p. 2565-2576
Assunto Buracos negros
Deslocamento para o vermelho
Espectroscopia infravermelha
Espectroscopia otica
Galáxias ativas
Galaxias seyfert
Quasars
[en] Galaxies: Seyfert
[en] Infrared: galaxies
[en] Quasars: emission lines
[en] Quasars: individual: 1H 0323+342
[en] X-rays: galaxies
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/164963
Arquivos Descrição Formato
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