LAXPC / AstroSat Study of ~ 1 and ~ 2 mHz Quasi-periodic Oscillations in the Be/X-ray Binary 4U 0115+63 During its 2015 Outburst
| Autor: | Manojendu Choudhury, Tilak Katoch, Biswajit Paul, Jai Verdhan Chauhan, J. S. Yadav, P. C. Agrawal, Dipankar Bhattacharya, R. K. Manchanda, Ranjeev Misra, Jayashree Roy, Nirmal Iyer, Parag Shah, P. Madhavani, Dhiraj Dedhia, H. M. Antia, Mayukh Pahari |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) 010504 meteorology & atmospheric sciences Astrophysics::High Energy Astrophysical Phenomena X-ray binary Proportional counter FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences Instability law.invention Black hole Telescope Neutron star Accretion disc Space and Planetary Science law 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Quasi periodic Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| DOI: | 10.48550/arxiv.1901.09382 |
| Popis: | The Be X-ray Binary 4U 0115+63 was observed by Large Area X-ray Proportional Counter (LAXPC) instrument on AstroSat on 2015 October 24 during the peak of a giant Type II outburst. Prominent intensity oscillations at ~ 1 and ~ 2 mHz frequency were detected during the outburst. Nuclear Spectroscopic Telescope Array (NuSTAR) observations made during the same outburst also show mHz quasi periodic oscillations (QPOs). Details of the oscillations and their characteristics deduced from LAXPC/AstroSat and NuSTAR observations are reported in this paper. Analysis of the archival Rossi X-ray Timing Explorer (RXTE)/Proportional Counter Array (PCA) data during 2001-11 also show presence of mHz QPOs during some of the outbursts and details of these QPOs are also reported. Possible models to explain the origin of the mHz oscillations are examined. Similar QPOs, albeit at higher frequencies, have been reported from other neutron star and black hole sources and both may have a common origin. Current models to explain the instability in the inner accretion disk causing the intense oscillations are discussed. Comment: Accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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