Accretion Flow Properties of Swift J1727.8-1613 and Estimation of the BH Mass

The rising phase of the 2023-24 outburst of the recently discovered bright transient black hole candidate Swift J1727.8-1613 was monitored by {\it Insight}-HXMT. We study the evolution of hard ( $4$ -150 $k e V) a n d s o f t ($ 2 $-$ 4 $k e V) b a n d p h o t o n c o u n t r a t e s, t h e h a r d n e s s r a t i o (H R), Q P O f r e q u e n c i e s, a n d s p e c t r a l f e a t u r e s u s i n g d a i l y o b s e r v a t i o n s f r o m t h e H X M T / L E, M E, a n d H E i n s t r u m e n t s b e t w e e n A u g u s t 25 a n d O c t o b e r 5, 2023. T h e Q P O f r e q u e n c y i s f o u n d t o b e s t r o n g l y c o r r e l a t e d w i t h t h e s o f t - b a n d X - r a y c o u n t r a t e s, a n d s p e c t r a l p h o t o n i n d i c e s . I n c o n t r a s t, a s t r o n g a n t i - c o r r e l a t i o n i s o b s e r v e d b e t w e e n H R a n d Q P O f r e q u e n c y, a s w e l l a s b e t w e e n H R a n d p h o t o n i n d e x . B a s e d o n t h e e v o l u t i o n o f t h e t e m p o r a l a n d s p e c t r a l p r o p e r t i e s, t h e r i s i n g p h a s e o f t h e o u t b u r s t i s s u b d i v i d e d i n t o s i x p a r t s . T h e e v o l u t i o n o f t h e Q P O s i n p a r t s 1 - 5 i s f i t t e d w i t h t h e p r o p a g a t i n g o s c i l l a t o r y s h o c k (P O S) s o l u t i o n t o u n d e r s t a n d t h e n a t u r e o f t h e e v o l u t i o n f r o m a p h y s i c a l p e r s p e c t i v e . A n i n w a r d - p r o p a g a t i n g s h o c k w i t h w e a k e n i n g s t r e n g t h (e x c e p t i n p a r t 4) i s o b s e r v e d d u r i n g t h e p e r i o d o f o u r s t u d y . T h e p r o b a b l e m a s s o f t h e s o u r c e i s e s t i m a t e d t o b e$ 13.5 \pm 1.9~M_\odot $u s i n g t h e Q P O f r e q u e n c y ($ ν $) - p h o t o n i n d e x ($ Γ$) scaling method.

Accretion Flow Properties of Swift J1727.8-1613 and Estimation of the BH Mass

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Accretion Flow Properties of Swift J1727.8-1613 and Estimation of the BH Mass

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Accretion Flow Properties of Swift J1727.8-1613 and Estimation of the BH Mass

文献摘要

讨论

|讲解博客

|AI智能校验

Accretion Flow Properties of Swift J1727.8-1613 and Estimation of the BH Mass

文献摘要

讨论

|讲解博客

|AI智能校验

讲解博客

AI智能校验

讲解博客

AI智能校验