The Spectral Sharpness Angle of Gamma-ray Bursts
We extend the results of Yu et al. (2015b) of the novel sharpness angle measurement to a large number of spectra obtained from the Fermi gamma-ray burst monitor. The sharpness angle is compared to the values obtained from various representative emission models: blackbody, single-electron synchrotr...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
The Korean Space Science Society
2016-06-01
|
| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2016/v33n2/OJOOBS_2016_v33n2_109.pdf |
| _version_ | 1827392491329945600 |
|---|---|
| author | Hendrik J. van Eerten Jochen Greiner Re’em Sari P. Narayana Bhat Andreas von Kienlin William S. Paciesas Robert D. Preece |
| author_facet | Hendrik J. van Eerten Jochen Greiner Re’em Sari P. Narayana Bhat Andreas von Kienlin William S. Paciesas Robert D. Preece |
| author_sort | Hendrik J. van Eerten |
| collection | DOAJ |
| description | We extend the results of Yu et al. (2015b) of the novel sharpness angle measurement to a large number of spectra
obtained from the Fermi gamma-ray burst monitor. The sharpness angle is compared to the values obtained from various
representative emission models: blackbody, single-electron synchrotron, synchrotron emission from a Maxwellian or
power-law electron distribution. It is found that more than 91% of the high temporally and spectrally resolved spectra are
inconsistent with any kind of optically thin synchrotron emission model alone. It is also found that the limiting case, a
single temperature Maxwellian synchrotron function, can only contribute up to 58+23
-18% of the peak flux. These results show
that even the sharpest but non-realistic case, the single-electron synchrotron function, cannot explain a large fraction of
the observed spectra. Since any combination of physically possible synchrotron spectra added together will always further
broaden the spectrum, emission mechanisms other than optically thin synchrotron radiation are likely required in a full
explanation of the spectral peaks or breaks of the GRB prompt emission phase. |
| first_indexed | 2024-03-08T17:32:18Z |
| format | Article |
| id | doaj.art-fffbf3f860bd4dc482227592b9ab1829 |
| institution | Directory Open Access Journal |
| issn | 2093-5587 2093-1409 |
| language | English |
| last_indexed | 2024-03-08T17:32:18Z |
| publishDate | 2016-06-01 |
| publisher | The Korean Space Science Society |
| record_format | Article |
| series | Journal of Astronomy and Space Sciences |
| spelling | doaj.art-fffbf3f860bd4dc482227592b9ab18292024-01-02T14:45:37ZengThe Korean Space Science SocietyJournal of Astronomy and Space Sciences2093-55872093-14092016-06-0133210911710.5140/JASS.2016.33.2.109The Spectral Sharpness Angle of Gamma-ray BurstsHendrik J. van Eerten0Jochen Greiner1Re’em Sari2P. Narayana Bhat3Andreas von Kienlin4William S. Paciesas5Robert D. Preece6Max Planck Institute for Extraterrestrial Physics, Garching, Bayern 85748, GermanyMax Planck Institute for Extraterrestrial Physics, Garching, Bayern 85748, GermanyThe Hebrew University of Jerusalem, Jerusalem, IsraelCenter for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, Huntsville, AL 35805, USAMax Planck Institute for Extraterrestrial Physics, Garching, Bayern 85748, GermanyUniversities Space Research Association, Huntsville, AL 35805, USASpace Science Department, University of Alabama in Huntsville, Huntsville, AL 35809, USAWe extend the results of Yu et al. (2015b) of the novel sharpness angle measurement to a large number of spectra obtained from the Fermi gamma-ray burst monitor. The sharpness angle is compared to the values obtained from various representative emission models: blackbody, single-electron synchrotron, synchrotron emission from a Maxwellian or power-law electron distribution. It is found that more than 91% of the high temporally and spectrally resolved spectra are inconsistent with any kind of optically thin synchrotron emission model alone. It is also found that the limiting case, a single temperature Maxwellian synchrotron function, can only contribute up to 58+23 -18% of the peak flux. These results show that even the sharpest but non-realistic case, the single-electron synchrotron function, cannot explain a large fraction of the observed spectra. Since any combination of physically possible synchrotron spectra added together will always further broaden the spectrum, emission mechanisms other than optically thin synchrotron radiation are likely required in a full explanation of the spectral peaks or breaks of the GRB prompt emission phase.http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2016/v33n2/OJOOBS_2016_v33n2_109.pdfgamma-rays: starsgamma-ray burst: generalradiation mechanisms: non-thermalradiation mechanisms: thermal |
| spellingShingle | Hendrik J. van Eerten Jochen Greiner Re’em Sari P. Narayana Bhat Andreas von Kienlin William S. Paciesas Robert D. Preece The Spectral Sharpness Angle of Gamma-ray Bursts Journal of Astronomy and Space Sciences gamma-rays: stars gamma-ray burst: general radiation mechanisms: non-thermal radiation mechanisms: thermal |
| title | The Spectral Sharpness Angle of Gamma-ray Bursts |
| title_full | The Spectral Sharpness Angle of Gamma-ray Bursts |
| title_fullStr | The Spectral Sharpness Angle of Gamma-ray Bursts |
| title_full_unstemmed | The Spectral Sharpness Angle of Gamma-ray Bursts |
| title_short | The Spectral Sharpness Angle of Gamma-ray Bursts |
| title_sort | spectral sharpness angle of gamma ray bursts |
| topic | gamma-rays: stars gamma-ray burst: general radiation mechanisms: non-thermal radiation mechanisms: thermal |
| url | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2016/v33n2/OJOOBS_2016_v33n2_109.pdf |
| work_keys_str_mv | AT hendrikjvaneerten thespectralsharpnessangleofgammaraybursts AT jochengreiner thespectralsharpnessangleofgammaraybursts AT reemsari thespectralsharpnessangleofgammaraybursts AT pnarayanabhat thespectralsharpnessangleofgammaraybursts AT andreasvonkienlin thespectralsharpnessangleofgammaraybursts AT williamspaciesas thespectralsharpnessangleofgammaraybursts AT robertdpreece thespectralsharpnessangleofgammaraybursts AT hendrikjvaneerten spectralsharpnessangleofgammaraybursts AT jochengreiner spectralsharpnessangleofgammaraybursts AT reemsari spectralsharpnessangleofgammaraybursts AT pnarayanabhat spectralsharpnessangleofgammaraybursts AT andreasvonkienlin spectralsharpnessangleofgammaraybursts AT williamspaciesas spectralsharpnessangleofgammaraybursts AT robertdpreece spectralsharpnessangleofgammaraybursts |