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Black hole GRS 1915+105
July 30 , 2025
16 hrs 0 min
47
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- GRS 1915+105 is located 28,000 light-years away and exhibits dynamic and unusual behavior.
- It is black hole X-ray binary system with a 12-solar-mass black hole and a companion star.
- India’s AstroSat, launched in 2015, has been continuously monitoring this black hole.
- The X-ray brightness from GRS 1915+105 fluctuates between low (‘dip’) and high (‘non-dip’) phases lasting a few hundred seconds.
- During high-brightness phases, rapid X-ray flickers called Quasi-periodic Oscillations (QPOs) occur at about 70 times per second.
- It is linked to a compact, superheated plasma corona around the black hole.
- When the brightness dips, the corona expands and cools, causing the flickers to disappear.
- This suggesting the oscillating corona is the source of these fast QPO signals.
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