Centaurus X-3, Pulsars & Neutron Stars

Why in News?

Scientists have discovered that Centaurus X-3, one of the brightest X-ray pulsars, is accreting matter through an accretion disk. This behaviour is considered rare for pulsars of its kind. The finding may help improve models of Centaurus X-3 and enhance understanding of binary pulsars.

About Centaurus X-3

• Nature: A high-mass X-ray binary (HMXB) system.
• Location: Approximately 24,000 light-years away, in the constellation Centaurus.
• Discovery: One of the first X-ray pulsars discovered and the third X-ray source identified in the constellation Centaurus.
• Companion star: A massive star with more than 10 times the Sun’s mass.
• Accretion: The pulsar’s strong gravitational field draws material from its companion star. The material can form an accretion disk and emit X-rays as it moves towards the neutron star.

What Is an X-ray Binary Pulsar?

• An X-ray binary pulsar consists of a pulsar and a companion star bound together by gravity.
• When the pulsar pulls matter from its companion, the infalling material releases energy and produces X-rays. Studying these systems helps scientists understand matter under extreme gravitational and magnetic conditions.

What Is a Pulsar?

• A pulsar is a rapidly rotating, highly magnetised neutron star that emits beams of electromagnetic radiation, often from regions near its magnetic poles.
• As the neutron star rotates, its radiation beams sweep across space. When a beam passes across Earth’s line of sight, astronomers detect a pulse of radiation, similar to the light from a rotating lighthouse.

• Origin: Formed when a massive star exhausts its nuclear fuel and collapses.
• High density: A neutron star contains roughly a Sun’s mass compressed into a sphere about the size of a city.
• Rapid rotation: Some pulsars rotate hundreds of times per second and are called millisecond pulsars.
• Wide range of rotation periods: Pulsars range from extremely rapid rotators to very slowly rotating objects.

Astronomers have discovered more than 3,000 pulsars, according to the supplied text.

What Is an Accretion Disk?

• An accretion disk is a rotating structure of gas and other matter that gradually moves towards a massive central object under gravity.
• In an X-ray binary system: The neutron star’s gravity attracts matter from its companion, the transferred matter may form a rotating disk around the neutron star, friction and gravitational energy release heat as matter moves inward, the hot material emits high-energy radiation, including X-rays.

What Are Neutron Stars?

• Neutron stars are extremely dense remnants formed when massive stars collapse after exhausting their nuclear fuel. They may exist alone or in binary systems with companion stars.
• Their intense gravity, strong magnetic fields and rapid rotation make them important objects for studying extreme physical conditions.

Sources: PIB & NASA

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