File:GRB 991216- Chandra Helps Put The Pieces Together On Gamma-Ray Bursts (2000-0596).pdf
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![File:GRB 991216- Chandra Helps Put The Pieces Together On Gamma-Ray Bursts (2000-0596).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/5/5b/GRB_991216-_Chandra_Helps_Put_The_Pieces_Together_On_Gamma-Ray_Bursts_%282000-0596%29.pdf/page1-463px-GRB_991216-_Chandra_Helps_Put_The_Pieces_Together_On_Gamma-Ray_Bursts_%282000-0596%29.pdf.jpg?20240615170814)
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Captions
This composite image shows the X-ray spectrum and CCD image of the gamma-ray burst (GRB) known as GRB991216.
Summary
[edit]DescriptionGRB 991216- Chandra Helps Put The Pieces Together On Gamma-Ray Bursts (2000-0596).pdf |
English: This composite image shows the X-ray spectrum and CCD image of the gamma-ray burst (GRB) known as GRB991216. An international team used Chandra to observe iron emission lines from ejected material surrounding GRB991216, the first time emission lines associated with GRBs have been unambiguously detected and their properties precisely measured at X-ray wavelengths. These data strengthens that GRBs are the result of a "hypernova," a gigantic star collapsing on itself under its own weight. While GRB afterglows have been studied in the optical, radio, and X-ray regimes for some time, high precision X-ray observations were needed to detect the dense, massive medium that would exist if the scenario of a massive progenitor were true. With Chandra, the scientists believe they are seeing the iron emission that is predicted if the surrounding medium becomes heavily ionized and recombination takes place after being hit with the radiation produced by the GRB and its afterglow. Chandra observed GRB991216 on December 18, 1999, using the High Energy Grating Spectrometer (HETG) in conjunction with the Advanced CCD Imaging Spectrometer (ACIS) for 3.4 hours. |
Date | 3 November 2000 (upload date) |
Source | GRB 991216: Chandra Helps Put The Pieces Together On Gamma-Ray Bursts |
Author | NASA/CNR/L.Piro et al. |
Other versions |
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Category InfoField | Miscellaneous Objects |
Constellation InfoField | Pisces |
Coordinates (J2000) InfoField | RA 05h 09m 31.20s |
Distance Estimate InfoField | 8 billion light years |
Observation Date(s) InfoField | December 18, 1999 |
Observation Time InfoField | 3 hours |
Scale InfoField | Image is across. |
Instruments InfoField | HETG |
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This media is a product of the Chandra X-ray Observatory Credit and attribution belongs to the mission team, if not already specified in the "author" row |
Licensing
[edit]Public domainPublic domainfalsefalse |
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ![]() |
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current | 17:08, 15 June 2024 | ![]() | 1,275 × 1,650 (47 KB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://chandra.si.edu/photo/2000/0596/0596_hand.pdf via Commons:Spacemedia |
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Date and time of digitizing | 20:28, 2 July 2003 |
File change date and time | 16:14, 13 March 2018 |
Date metadata was last modified | 16:14, 13 March 2018 |
Software used | Adobe PageMaker 6.52 |
Conversion program | Acrobat Distiller 5.0.2 for Macintosh |
Encrypted | no |
Page size | 612 x 792 pts (letter) |
Version of PDF format | 1.6 |
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f088cc09c98e784c712bb86f3b76eae56bacc632
3 November 2000
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