B2 1023+25 is an extremely radio-loud quasar at z = 5.3 that was first identified as a likely high-redshift blazar candidate in the SDSS+FIRST quasar catalog. Here, we use the Nuclear Spectroscopic Telescope Array (NuSTAR) to investigate its non-thermal jet emission, whose high-energy component we detected in the hard X-ray energy band. The X-ray flux is (5-10 keV) and the photon spectral index is ΓX ≃ 1.3-1.6. Modeling the full spectral energy distribution, we find that the jet is oriented close to the line of sight, with a viewing angle of ∼3°, and has significant Doppler boosting, with a large bulk Lorentz factor ∼13, which confirms the identification of B2 1023+25 as a blazar. B2 1023+25 is the first object at redshift larger than 5 detected by NuSTAR, demonstrating the ability of NuSTAR to investigate the early X-ray universe and to study extremely active supermassive black holes located at very high redshift. © 2013. The American Astronomical Society. All rights reserved

Sbarrato, T., Tagliaferri, G., Ghisellini, G., Perri, M., Puccetti, S., Baloković, M., et al. (2013). NuSTAR Detection of the blazar B2 1023+25 at redshift 5.3. THE ASTROPHYSICAL JOURNAL, 777(2) [10.1088/0004-637X/777/2/147].

NuSTAR Detection of the blazar B2 1023+25 at redshift 5.3

SBARRATO, TULLIA
Primo
;
GHISELLINI, GABRIELE;NARDINI, MARCO;
2013

Abstract

B2 1023+25 is an extremely radio-loud quasar at z = 5.3 that was first identified as a likely high-redshift blazar candidate in the SDSS+FIRST quasar catalog. Here, we use the Nuclear Spectroscopic Telescope Array (NuSTAR) to investigate its non-thermal jet emission, whose high-energy component we detected in the hard X-ray energy band. The X-ray flux is (5-10 keV) and the photon spectral index is ΓX ≃ 1.3-1.6. Modeling the full spectral energy distribution, we find that the jet is oriented close to the line of sight, with a viewing angle of ∼3°, and has significant Doppler boosting, with a large bulk Lorentz factor ∼13, which confirms the identification of B2 1023+25 as a blazar. B2 1023+25 is the first object at redshift larger than 5 detected by NuSTAR, demonstrating the ability of NuSTAR to investigate the early X-ray universe and to study extremely active supermassive black holes located at very high redshift. © 2013. The American Astronomical Society. All rights reserved
Articolo in rivista - Articolo scientifico
galaxies: active; quasars: general; X-rays: general; Space and Planetary Science; Astronomy and Astrophysics
English
2013
777
2
147
none
Sbarrato, T., Tagliaferri, G., Ghisellini, G., Perri, M., Puccetti, S., Baloković, M., et al. (2013). NuSTAR Detection of the blazar B2 1023+25 at redshift 5.3. THE ASTROPHYSICAL JOURNAL, 777(2) [10.1088/0004-637X/777/2/147].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/106887
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