Timing analysis of 2S 1417-624 observed with NICER and Insight-HXMT

Ji, L.; Doroshenko, V; Santangelo, A.; Gungor, Can; Zhang, S.; Ducci, L.; Zhang, S-N; Ge, M-Y; Qu, L.; Chen, Y.; Bu, Q.; Cai, C.; Cao, X.; Chang, Z.; Chen, G.; Chen, L.; Chen, T.; Chen, Y.; Chen, Y.; Cui, W.; Cui, W.; Deng, J.; Dong, Y.; Du, Y.; Fu, M.; Gao, G.; Gao, H.; Gao, M.; Gu, Y.; Guan, J.; Guo, C.; Han, D.; Huang, Y.; Huo, J.; Jia, S.; Jiang, L.; Jiang, W.; Jin, J.; Kong, L.; Li, B.; Li, C.; Li, G.; Li, M.; Li, T.; Li, W.; Li, X.; Li, X.; Li, X.; Li, Y.; Li, Z.; Liang, X.; Liao, J.; Liu, C.; Liu, G.; Liu, H.; Liu, X.; Liu, Y.; Lu, B.; Lu, F.; Lu, X.; Luo, Q.; Luo, T.; Ma, X.; Meng, B.; Nang, Y.; Nie, J.; Ou, G.; Sai, N.; Song, L.; Song, X.; Sun, L.; Tan, Y.; Tao, L.; Tuo, Y.; Wang, C.; Wang, G.; Wang, J.; Wang, W.; Wang, Y.; Wen, X.; Wu, B.; Wu, B.; Wu, M.; Xiao, G.; Xiao, S.; Xiong, S.; Xu, Y.; Yang, Y.; Yang, J.; Yang, S.; Yi, Q.; Yin, Q.; You, Y.; Zhang, A.; Zhang, C.; Zhang, F.; Zhang, H.; Zhang, J.; Zhang, T.; Zhang, W.; Zhang, W.; Zhang, W.; Zhang, Y.; Zhang, Y.; Zhang, Y.; Zhang, Z.; Zhang, Z.; Zhao, H.; Zhao, X.; Zheng, S.; Zhou, D.; Zhou, J.; Zhu, Y.; Zhu, Y.

doi:10.1093/mnras/stz2745

Timing analysis of 2S 1417-624 observed with NICER and Insight-HXMT

Atıf İçin Kopyala

Ji L., Doroshenko V., Santangelo A., Gungor C., Zhang S., Ducci L., ...Daha Fazla

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, cilt.491, sa.2, ss.1851-1856, 2020 (SCI-Expanded)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 491 Sayı: 2
Basım Tarihi: 2020
Doi Numarası: 10.1093/mnras/stz2745
Dergi Adı: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, INSPEC, Metadex, zbMATH, DIALNET, Civil Engineering Abstracts
Sayfa Sayıları: ss.1851-1856
İstanbul Üniversitesi Adresli: Hayır

Özet

We present a study of timing properties of the accreting pulsar 2S 1417-624 observed during its 2018 outburst, based on Swift/BAT, Fermi/GBM, Insight-HXMT, and NICER observations. We report a dramatic change of the pulse profiles with luminosity. The morphology of the profile in the range 0.2-10.0 keV switches from double to triple peaks at similar to 2.5 x 10(37)D(10)(2) erg s(-1) and from triple to quadruple peaks at similar to 7x10(37)D(10)(2) erg s(-1). The profile at high energies (25-100 keV) shows significant evolutions as well. We explain this phenomenon according to existing theoretical models. We argue that the first change is related to the transition from the sub to the supercritical accretion regime, while the second to the transition of the accretion disc from the gas-dominated to the radiation pressure-dominated state. Considering the spin-up as well due to the accretion torque, this interpretation allows to estimate the magnetic field self-consistently at similar to 7 x 10(12) G.