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http://hdl.handle.net/20.500.12386/32467
Titolo: | Phase-dependent Evolution within the Large Luminosity Range of 1A 0535+262 Observed by Insight-HXMT during 2020 Giant Outburst | Autori: | Kong, Ling-Da Zhang, Shu Ji, Long Doroshenko, Victor Santangelo, Andrea ORLANDINI, MAURO Frontera, Filippo Li, Jian Chen, Yu-Peng Wang, Peng-Ju Chang, Zhi Qu, Jin-Lu Zhang, Shuang-Nan |
Data pubblicazione: | 2022 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 932 | Fascicolo: | 2 | Da pagina:: | 106 | Abstract: | We have performed phase-resolved spectral analysis of the accreting pulsar 1A 0535+262 based on observations of Insight-HXMT during the 2020 type II outburst of the source. We focus on the two-dimensional dependence of the cyclotron resonance scattering features (CRSFs) along the outburst time and at different phases. The fundamental CRSF line (f-CRSF) shows different time- and phase-dependent behaviors. At higher luminosity, the phase profile of the f-CRSF energy changes from a single peak to double peaks, with the transition occurring at MJD 59185. On the contrary, the first harmonic CRSF (first CRSF) at ∼100 keV is only detected within a narrow phase range (0.8−1.0) accompanied by a shallow f-CRSF line. Based on these results, we speculate that when the source enters the supercritical regime, the higher accretion column height can significantly enhance the harmonic line at a narrow phase through an "anti-pencil" beam at a higher energy band. At the same time, it will also affect the behavior of the fundamental line. | URI: | http://hdl.handle.net/20.500.12386/32467 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ac6e66 https://arxiv.org/pdf/2204.11222 |
ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ac6e66 | Bibcode ADS: | 2022ApJ...932..106K | Fulltext: | open |
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