AstroSat observations indicated a fluctuating plasma corona associated with high-frequency Quasi-periodic Oscillations (QPOs)
What exactly is GRS 1915+105?
It is a stellar-mass black hole situated in a binary system, coupled with a normal star, and recognized for its highly variable X-ray emissions.
Found By: Identified in 1992 by the WATCH all-sky surveillance on the Granat
Situated at about 28,000 light-years from Earth in the Aquila constellation, inside the Milky Way galaxy.
Main Characteristics:
Mass: approximately 12 times the solar mass.
High Variability: Displays fluctuating X-ray dips and flares every several hundred seconds.
High Frequency QPOs Observed: Fast flashes at 70 Hz (Quasi-periodic Oscillations) during luminous stages.
Plasma Corona: Alternates between dense-hot and expanded-cool phases, influencing X-ray fluctuations.
Accretion Process: Draws in material from a companion star, creating a rotating accretion disk (1–10 million °C) and an extremely hot corona (~100 million °C).
Importance:
AstroSat Milestone: First Indian telescope to observe real-time dynamic behavior of the corona.
Theoretical Progress: Endorses the notion that compact corona surrounding black holes gives rise to high-frequency X-ray flickers.
Astrophysics Insight: Assists in unraveling the physical conditions adjacent to event horizons where gravitational forces are intense.
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