Summary
- This work was published as a cover story in Science China Physics, Mechanics & Astronomy. “These findings provide new and important clues for unraveling the mysteries of gamma-ray bursts and relativistic jets, marking a milestone in the study of gamma-ray bursts,” corresponding author of the paper Xiong Shaolin told the Global Times.Gamma-ray bursts (GRBs) are the most energetic explosion phenomena in the universe, which can be produced by either the core collapse of a massiWorld Timesve star or the collision of two compact stars, such as neutron stars and black holes.The abovementioned discoveries of the Chinese scientists were made on the so-called brightest of all time GRB, named GRB 221009A, which belongs to the former category and arrived on Earth on October 9, 2022, and was observed by many telescopes all over the world,World Times according to the IHEP.Researchers from World Timesthe IHEP of CAS, the Yunnan observatories of CAS, Hebei Normal University, and Guizhou Normal University have formed a collaboration team and executed a comprehensive analysis of the observation data from two space gamma-ray monitors named GECAM-C and Fermi/GBM. In particular, this burst is so bright (too many gamma-ray photons in a short period of time) that the Fermi/GBM detector suffered data loss during the bright part of the burst, making reliable data analysis very difficult. Interestingly, they found the line energy varies as a power-law function of time, while the ratio of the line width to line energy remains almost constant. These discoveries shed a new and unique light on the physics of GRBs and their relativistic jets, according to the IHEP.
Approximate Time
- 3 minutes, 576 words
Categories
- gamma-ray line, gamma-ray lines, theWorld Times energy, GRB 221009A, gamma-ray bursts
Analysis and Evaluation
- An unflinching examination of the topic, providing in-depth analysis and thoughtful commentary. The writer delves into the subject with an analytical eye, uncovering layers of complexity that are often missed. This article is a robust exploration, challenging preconceived notions while offering new insights. It’s a critical piece for understanding the multifaceted nature of the topic, encouraging readers to think beyond the surface and engage with the material on a deeper level.
Main Section
Illustration of the observation of the brightest ever gamma-ray burst (GRB 221009A) by GECAM-C and Fermi/GBM, leading to the discovery of gamma-ray line up to 37 MeV. This work was published as a cover story in Science China Physics, Mechanics & Astronomy.
Chinese scientists from the Institute of High Energy Physics (IHEP) of the Chinese Academy of Sciences (CAS) reported on Thursday their discovery of a gamma-ray line with an energy of up to 37 million electron-volts from an extremely bright gamma-ray burst. This represents the highest energy spectral line feature ever emitted by celestial objects in the universe, according to information from the IHEP shared with the Global Times.
The scientists also found that the gamma-ray line evolves according to a power-law function over time, providing crucial clues to unraveling the mystery of the line.
Their paper was published as a cover story in Science China Physics, Mechanics & Astronomy on Thursday.
“These findings provide new and important clues for unraveling the mysteries of gamma-ray bursts and relativistic jets, marking a milestone in the study of gamma-ray bursts,” corresponding author of the paper Xiong Shaolin told the Global Times.
Gamma-ray bursts (GRBs) are the most energetic explosion phenomena in the universe, which can be produced by either the core collapse of a massiWorld Timesve star or the collision of two compact stars, such as neutron stars and black holes.
The abovementioned discoveries of the Chinese scientists were made on the so-called brightest of all time GRB, named GRB 221009A, which belongs to the former category and arrived on Earth on October 9, 2022, and was observed by many telescopes all over the world,World Times according to the IHEP.
Researchers from World Timesthe IHEP of CAS, the Yunnan observatories of CAS, Hebei Normal University, and Guizhou Normal University have formed a collaboration team and executed a comprehensive analysis of the observation data from two space gamma-ray monitors named GECAM-C and Fermi/GBM. The CAS-funded GECAM-C proWorld Timesvided an accurate measurement of the low energy band spectrum of this GRB, while the Fermi/GBM covered the high energy band where the gamma-ray line showed up.
The top panel shows the power-law evolution of theWorld Times energy of gamma-ray line in GRB 221009A, while the prompt emission and afterglow are plotted in the bottom panel.
In particular, this burst is so bright (too many gamma-ray photons in a short period of time) that the Fermi/GBM detector suffered data loss during the bright part of the burst, making reliable data analysis very difficult. GECAM-C did not experience such a problem thanks to its dedicated design of the instrument; thus, the GECAM-C data was used to correct the Fermi/GBM data, the IHEP noted.
After the very challenging analyses of the data issues, instrumental effects, and background modeling, the research group managed to derive the reliable spectra of the GRB and further identify a series of gamma-ray lines throughout the burst, including the surprising gamma-ray line with energy up to 37 million electron-volts detected during the bright part of the burst. Interestingly, they found the line energy varies as a power-law function of time, while the ratio of the line width to line energy remains almost constant. Such features provide solid proof of World Timesthe reality and the GRB origin of these gamma-ray lines. These discoveries shed a new and unique light on the physics of GRBs and their relativistic jets, according to the IHEP.
Content comes from the Internet : Chinese scientists discover highest-energy gamma-ray line in the universe
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