Accreting on the Edge: A Luminosity-dependent Cyclotron Line in the Be/X-Ray Binary 2S 1553-542 Accompanied by Accretion Regimes Transition
| Autor: | C. Malacaria, Y. Bhargava, Joel B. Coley, L. Ducci, P. Pradhan, R. Ballhausen, F. Fuerst, N. Islam, G. K. Jaisawal, P. Jenke, P. Kretschmar, I. Kreykenbohm, K. Pottschmidt, E. Sokolova-Lapa, R. Staubert, J. Wilms, C. A. Wilson-Hodge, Michael T. Wolff |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
X-ray binary stars Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Neutron stars Stellar accretion disks Space and Planetary Science Magnetic fields Astrophysics::Solar and Stellar Astrophysics ddc:530 Astrophysics - High Energy Astrophysical Phenomena Astrophysics::Galaxy Astrophysics |
| Zdroj: | Malacaria, C, Bhargava, Y, Coley, J B, Ducci, L, Pradhan, P, Ballhausen, R, Fuerst, F, Islam, N, Jaisawal, G K, Jenke, P, Kretschmar, P, Kreykenbohm, I, Pottschmidt, K, Sokolova-Lapa, E, Staubert, R, Wilms, J, Wilson-Hodge, C A & Wolff, M T 2022, ' Accreting on the Edge: A Luminosity-dependent Cyclotron Line in the Be/X-Ray Binary 2S 1553-542 Accompanied by Accretion Regimes Transition ', Astrophysical Journal, vol. 927, no. 2, 194 . https://doi.org/10.3847/1538-4357/ac524f |
| Popis: | Accreting X-ray pulsars (XRPs) undergo luminous X-ray outbursts during which the luminosity-dependent spectral and timing features of the neutron star's emission can be analyzed in detail, thus shedding light on the accretion regime at work. We took advantage of a monitoring campaign performed with NuSTAR, Swift/XRT, AstroSat and NICER, to follow the Be/X-ray Binary 2S 1553-542 along one of its rare outbursts and trace its spectral and timing evolution. We report the discovery of a luminosity-dependent cyclotron line energy for the first time in this source. The pulse profiles and pulsed fraction also show variability along the outburst, consistently with the interpretation that the source transitions from the sub-critical to the super-critical accretion regime, separated by a critical luminosity of L$_{crit}\approx4\times10^{37}$ erg/s. Accepted on ApJ. 11 pages, 7 figures, 3 tables |
| Databáze: | OpenAIRE |
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