Discovery of a new flaring class in GRS 1915+105 using AstroSat
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912303983624192 |
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| author | Dhaka, Ruchika Yadav, JS Misra, Ranjeev Jain, Pankaj |
| author_facet | Dhaka, Ruchika Yadav, JS Misra, Ranjeev Jain, Pankaj |
| contents | Highly variable Black Hole X-ray Binary (BHXB) GRS~1915+105 has shown many flaring classes when the source oscillates between the High Soft state (HS) and the Hard Intermediate state (HIMS) with a transition time of less than 10 s. The X-ray flux is anti-correlated with hardness ratio (HR2) during these X-ray flaring classes. We have analyzed Astrosat/LAXPC \& SXT data and report here a new X-ray flaring class named $η$ class when the source oscillates between two HS states (the power-law index is always greater than 4) with transition time around 50 s. The X-ray flux is correlated with hardness ratio. This class is quasi-regular, and we have detected High Frequency Quasi Periodic Oscillations (HFQPOs) around 70 Hz during this new flaring class. The accretion rate changes by a factor of three over the burst cycle. We report here the results of our extensive study of spectral and timing characteristics of this new class. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_00892 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Discovery of a new flaring class in GRS 1915+105 using AstroSat Dhaka, Ruchika Yadav, JS Misra, Ranjeev Jain, Pankaj High Energy Astrophysical Phenomena Highly variable Black Hole X-ray Binary (BHXB) GRS~1915+105 has shown many flaring classes when the source oscillates between the High Soft state (HS) and the Hard Intermediate state (HIMS) with a transition time of less than 10 s. The X-ray flux is anti-correlated with hardness ratio (HR2) during these X-ray flaring classes. We have analyzed Astrosat/LAXPC \& SXT data and report here a new X-ray flaring class named $η$ class when the source oscillates between two HS states (the power-law index is always greater than 4) with transition time around 50 s. The X-ray flux is correlated with hardness ratio. This class is quasi-regular, and we have detected High Frequency Quasi Periodic Oscillations (HFQPOs) around 70 Hz during this new flaring class. The accretion rate changes by a factor of three over the burst cycle. We report here the results of our extensive study of spectral and timing characteristics of this new class. |
| title | Discovery of a new flaring class in GRS 1915+105 using AstroSat |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2504.00892 |