Fast X-ray Transients (FXTs)

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Fast X-ray Transients (FXTs)

News:

Think of Fast X-ray Transients (FXTs) as brief cosmic flashes, like a camera flash in space, but instead of visible light they emit X-rays.

What are FXTs?

1. They are sudden bursts of X-rays coming from distant parts of the universe.
2. They last only a few minutes to a few hours and then disappear.
3. They do not repeat, which makes them difficult to study.
4. Scientists discovered this type of event only about 10 years ago.

What causes them? Astronomers believe FXTs happen during extremely violent events in space, such as:

1. A massive star collapsing and exploding as a supernova.
2. Two neutron stars colliding and merging.
3. A white dwarf star being torn apart by a black hole.
4. Formation of a highly magnetized, rapidly spinning neutron star.

Connection with Gamma-Ray Bursts:

Many FXTs seem to be related to long-duration gamma-ray bursts (GRBs), which are among the most powerful explosions in the universe.

1. Sometimes the gamma rays are detected along with the X-rays.
2. Sometimes only the X-rays are seen. These are called "orphan afterglows" or may be due to faint gamma-ray bursts.

What happened on 7 November 2024?

 

A special FXT event named EP241107a was detected by the Chinese space telescope Einstein Probe. Scientists from the Indian Institute of Astrophysics studied it using many telescopes around the world.

What did they discover?

They found a radio signal coming from the same place as the X-ray flash. This helped them understand what caused the event.

The evidence suggests that the flash was likely produced by:

1. the collapse of a massive star, or
2. the merger of two neutron stars.

 

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