NuSTAR, Swift, and GROND Observations of the Flaring MeV Blazar PMN J0641-0320

M. Ajello, G. Ghisellini, V.~S. Paliya, D. Kocevski, G. Tagliaferri, G. Madejski, A. Rau, P. Schady, J. Greiner, F. Massaro, M. Balokovi, R. Bühler, M. Giomi, L. Marcotulli, F. D'Ammando, D. Stern, S.~E. Boggs, F.~E. Christensen, W.~W. Craig, C.~J. HaileyF.~A. Harrison, W.~W. Zhang

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19 Citations (SciVal)


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.
Original languageEnglish
Pages (from-to)76
Number of pages1
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 22 Jul 2016


  • galaxies: active, quasars: general, quasars: individual: PMN J0641─0320, X-rays: general, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics


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