Why in the News?
Researchers at the Indian Institute of Space Science and Technology (IIST) has detected radio emissions with circular polarisation near a massive young protostar, IRAS 18162-2048.
About Protostars:
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About the Protostar IRAS 18162-2048:
- Overview: Situated about 4,500 light years away in the Milky Way.
- Jet Feature: Powers the HH80-81 jet—one of the galaxy’s largest and brightest protostellar jets.
- Magnetic Detection: First direct evidence of magnetic fields from the protostar itself, not just its jet.
- Observation Challenges: Heavily shrouded in dense gas and dust, making traditional observation difficult.
- Jet Dynamics: Suggests that magnetic fields and rotational energy drive its development.
Recent Observations:
- Detection Method: Observed circular polarisation in radio waves—where electromagnetic fields rotate along their path.
- Rarity: Circular polarisation is extremely faint and seldom detected, even in intense sources like active galactic nuclei.
- Scientific Milestone: First-ever estimation of magnetic field strength near a massive protostar using circular polarisation.
- Magnetic Field Strength: Estimated to be 100 times stronger than Earth’s magnetic field.
- Theoretical Support: Findings reinforce the theory that magnetic fields power jets from both stars and black holes.
| [UPSC 2023] Consider the following pairs:
Objects in space :: Description 1. Cepheids : Giant clouds of dust and gas in space 2. Nebulae : Stars which brighten and dim periodically 3. Pulsars : Neutron stars that are formed when massive stars run out of fuel and collapse How many of the above pairs are correctly matched? Options: (a) Only one* (b) Only two (c) All three (d) None |
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