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India's Astrosat detects 67 bursts coming from a magnetar


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India's first multi-wavelength space-based observatory, AstroSat, has made a significant discovery by detecting bright pulses of energy coming from a magnetar in deep space.





AstroSat, India's premier multi-wavelength space-based observatory detected rapid sub-second X-ray bursts emanating from a novel neutron star boasting an ultrahigh magnetic field, known as a magnetar. This celestial revelation holds the potential to deepen our comprehension of the enigmatic and extreme astrophysical conditions inherent to magnetars. 

In a collaborative effort, scientists from the Raman Research Institute (RRI) and the University of Delhi leveraged the observational prowess of AstroSat to conduct a comprehensive study of the magnetar SGR J1830-0645, identified by NASA's Swift spacecraft in October 2020.

This particular magnetar is relatively new. It is an isolated neutron star and is about 24,000 years old. 

The data, obtained through the Large Area X-Ray Proportional Counter (LAXPC) and Soft X-Ray telescope (SXT) aboard AstroSat, promises to unveil the secrets concealed within the magnetar's high magnetic field.

The study determined that SGR J1830-0645 is a distinctive magnetar, showcasing a unique emission line in its spectra. However, what remains a captivating subject for further investigation is the presence of these emission lines, and their potential origin, whether from iron fluorescence, proton cyclotron line features, or instrumental effects. 

Dr. Sharma reportedly said, "The energy-dependence in SGR J1830-0645 was different from what was observed in several other magnetars. This research, thus, contributes to our understanding of magnetars and their extreme astrophysical conditions."



Edited by Ajay0
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  • 3 months later...

ISRO's Space Telescope Spots Over 600 Gamma-Ray Bursts Over 8 Years.





India's AstroSat space telescope has achieved a significant milestone by detecting more than 600 Gamma-Ray Burst (GRB), each marking the death of a massive star or merging of neutron stars.

"The detection of the 600th GRB is a great demonstration of the continued undiminished performance of Cadmium Zinc Telluride Imager (CZTI) eight years after launch, and well after its design lifetime," Dipankar Bhattacharya, the principal investigator for CZTI, said.

Dubbed as mini big-bangs, GRBs are the most energetic explosions in the universe, emitting more energy in seconds than the sun will emit in its entire lifetime, Gaurav Waratkar, a Ph.D student at IIT Bombay, who leads the study of GRBs with AstroSat, told PTI.



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AstroSat unravels mysteries surrounding Black Hole X-ray Binary MAXI J1820+070.



In a new study recently accepted in The Astrophysical Journal, an international team of scientists has used India's AstroSat's full multi-wavelength capabilities to unravel the mysteries of an X-ray binary system hosting a black hole.

AstroSat, equipped with three X-ray payloads and a UV telescope, captured soft and hard X-ray emissions and far ultraviolet radiation, painting a comprehensive portrait of the black hole in the X-ray binary system MAXI J1820+070.

This marks a historic achievement for AstroSat, showcasing the first utilisation of its full multi-wavelength capabilities. The collaborative effort includes researchers from India, the United Kingdom, Abu Dhabi, and Poland.

“AstroSat provides unique capability for multi-wavelength observations of X-ray binaries and other cosmic sources, and studies like this are indispensable for unraveling the complexities of these cosmic systems,” Prof. Gulab Dewangan, a faculty member at IUCAA, Pune, said in a statement.




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