XPoSat: A X-Ray Polarimeter Satellite

1 Dec 2023

Context: ISRO (India) is set to launch its first X-Ray Polarimeter Satellite. 

X-Ray Polarimeter Satellite (XPoSat): Key Highlights

  • X-Ray Polarimeter Satellite (XPoSat) will be launched by the Polar Satellite Launch Vehicle (PSLV) from the Satish Dhawan Space Center in Sriharikota. 
  •  Aim: It is India’s pioneering polarimetry mission aimed at studying various dynamics of astronomical sources in extreme conditions.
  • It is only the world’s second polarimetry mission using X-ray after NASA’s Imaging X-ray Polarimetry Explorer (IXPE) that was launched in 2021.

About XPoSat

  • XPoSat, India’s pioneering X-ray Polarimeter Satellite, marks the country’s first dedicated mission to delve into the dynamics of astronomical X-ray sources. 
  • XPoSat Objective: To explore various dynamics of bright astronomical X-ray sources in extreme conditions.
  • It carries two main scientific payloads in low Earth orbit:
  • POLIX (Polarimeter Instrument in X-rays): 
    • Measures polarization parameters in the medium X-ray energy range (8-30 keV) from astronomical sources. 
    • Developed by Raman Research Institute (RRI) in collaboration with U R Rao Satellite Centre (URSC).
    • Functionality: Polarimeter for astronomical observations in the 8-30 keV energy band.
    • Components: Includes a collimator, scatterer, and four X-ray proportional counter detectors.
    • Objective: Intends to observe nearly 40 bright astronomical sources over XPoSat’s planned 5-year mission lifespan, providing significant polarimetry insights.
  • XSPECT (X-ray Spectroscopy and Timing)
    • It provides spectroscopic information in the energy range of 0.8-15 keV for various X-ray sources, enhancing timing accuracy and resolution.
    • Features: Provides high-resolution spectroscopic information and timing capabilities in the 0.8-15 keV X-ray energy range.
    • Instrumentation: Employs Swept Charge Devices (SCDs) with superior energy resolution and passive collimators for background reduction.
    • Scope: Targets various sources, including X-ray pulsars, black hole binaries, and active galactic nuclei, enabling long-term monitoring and spectral state observations.
  • Significance of XPoSat in comprehending astronomical sources
    • Diagnostic method: Utilizing polarimetry measurements serves as a crucial diagnostic method for deciphering the emission processes from diverse astronomical sources.
    • Understanding the complexity of Astronomical Emission Mechanisms:  By amalgamating polarimetric observations with spectroscopic and timing measurements, scientists envisage surpassing the constraints of the current comprehension regarding astronomical emission processes.

Source: The Hindu

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UDAAN PRELIMS WALLAH
Comprehensive coverage with a concise format
Integration of PYQ within the booklet
Designed as per recent trends of Prelims questions
हिंदी में भी उपलब्ध

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