| タイトル | NuSTAR Detection of the Blazar B2 1023+25 at Redshift 5.3 |
| 本文（外部サイト） | http://hdl.handle.net/2060/20140017435 |
| 著者（英） | Giommi, P.; Sbarrato, T.; Zhang, William W.; Balokovic, M.; Tagliaferri, G.; Hovatta, T.; Sudilovsky, V.; Harrison, F. A.; Ghisellini, G.; Greiner, J.; Hailey, C. J.; Boggs, S. E.; Urry, C. M.; Christensen, F. E.; Puccetti, S.; Madejski, G. M.; Brandt, W. N.; Nardini, M.; Schady, P.; Stern, D.; Perri, M.; Rau, A. |
| 発行日 | 2013-10-23 |
| 言語 | eng |
| 内容記述 | B2 1023+25 is an extremely radio-loud quasar at zeta = 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 approximately 5.5 10 (exp 14) erg cm(exp 2) s(exp 1) (5-10 keV) and the photon spectral index is Gamma(x) approx. =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 approximately 3deg, and has significant Doppler boosting, with a large bulk Lorentz factor approximately 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. |
| NASA分類 | Astrophysics |
| レポートNO | GSFC-E-DAA-TN16041 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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