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Ajello, M.; Ghisellini, G.; Paliya, V. S.; Kocevski, D.; Tagliaferri, G.; Madejski, G.; Rau, A.; Schady, P.; Greiner, J.; Massaro, F.; Balokovi, M.; Bühler, R.; Giomi, M.; Marcotulli, L.; D'Ammando, F.; Stern, D.; Boggs, S. E.; Christensen, F. E.; Craig, W. W.; Hailey, C. J.; Harrison, F. A.; Zhang, W. W.
The Astrophysical journal, 07/2016, Letnik: 826, Številka: 1Journal Article
ABSTRACT MeV blazars are a sub-population of the blazar family, exhibiting larger-than-average jet powers, accretion luminosities, and black hole masses. Because of their extremely hard X-ray continua, these objects are best studied in the X-ray domain. Here, we report on the discovery by the Fermi Large Area Telescope and subsequent follow-up observations with NuSTAR, Swift, and GROND of a new member of the MeV blazar family: PMN J0641−0320. Our optical spectroscopy provides confirmation that this is a flat-spectrum radio quasar located at a redshift of z = 1.196. Its very hard NuSTAR spectrum (power-law photon index of ∼1 up to ∼80 keV) indicates that the emission is produced via inverse Compton scattering off of photons coming from outside the jet. The overall spectral energy distribution of PMN J0641−0320 is typical of powerful blazars and, using a simple one-zone leptonic emission model, we infer that the emission region is located either inside the broad line region or within the dusty torus.
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