On Spatial Distribution of Short Gamma-Ray Bursts from Extragalactic Magnetar Flares
Recently, one interesting possibility is proposed that a magnetar can be a progenitor of short and hard gamma-ray bursts (GRBs). If this is true, one may expect that the short and hard GRBs, at least some of GRBs in this class, are distributed in the Euclidean space and that the angular position of...
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| Format: | Article |
| Language: | English |
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The Korean Space Science Society
2002-03-01
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| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2002/v19n1/OJOOBS_2002_v19n1_1.pdf |
| _version_ | 1797329691744403456 |
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| author | Heon-Young Chang Hee Il Kim |
| author_facet | Heon-Young Chang Hee Il Kim |
| author_sort | Heon-Young Chang |
| collection | DOAJ |
| description | Recently, one interesting possibility is proposed that a magnetar can be a progenitor of short and hard gamma-ray bursts (GRBs). If this is true, one may expect that the short and hard GRBs, at least some of GRBs in this class, are distributed in the Euclidean space and that the angular position of these GRBs is correlated with galaxy clusters. Even though it is reported that the correlation is statistically marginal, the observed value of <V/Vmax> deviates from the Euclidean value. The latter fact is often used as evidence against a local extragalactic origin for short GRB class. We demonstrate that GRB sample of which the value of <V/Vmax> deviates from the Euclidean value can be spatially confined within the low value of z. We select very short bursts (T90<0.3 sec) from the BATSE 4B catalog. The value of <V/Vmax> of the short bursts is 0.4459. Considering a conic-beam and a cylindrical beam for the luminosity function, we deduce the corresponding spatial distribution of the GRB sources. We also calculate the fraction of bursts whose redshifts are larger than a certain redshift {z'}, i.e. f> z'. We find that GRBs may be distributed near to us, despite the non-Euclidean value of <V/Vmax>. A broad and uniform beam pattern seems compatible with the magnetar model in that the magnetar model requires a small zmax. |
| first_indexed | 2024-03-08T07:09:08Z |
| format | Article |
| id | doaj.art-de7b060759644c3f89267b9910e6d228 |
| institution | Directory Open Access Journal |
| issn | 2093-5587 2093-1409 |
| language | English |
| last_indexed | 2024-03-08T07:09:08Z |
| publishDate | 2002-03-01 |
| publisher | The Korean Space Science Society |
| record_format | Article |
| series | Journal of Astronomy and Space Sciences |
| spelling | doaj.art-de7b060759644c3f89267b9910e6d2282024-02-03T03:38:28ZengThe Korean Space Science SocietyJournal of Astronomy and Space Sciences2093-55872093-14092002-03-011911610.5140/JASS.2002.19.1.001On Spatial Distribution of Short Gamma-Ray Bursts from Extragalactic Magnetar FlaresHeon-Young Chang0Hee Il Kim1Korea Institute for Advanced Study, Seoul, Korea 130-012Department of Physics, Kunsan National University, Kunsan, Korea 573-701 Recently, one interesting possibility is proposed that a magnetar can be a progenitor of short and hard gamma-ray bursts (GRBs). If this is true, one may expect that the short and hard GRBs, at least some of GRBs in this class, are distributed in the Euclidean space and that the angular position of these GRBs is correlated with galaxy clusters. Even though it is reported that the correlation is statistically marginal, the observed value of <V/Vmax> deviates from the Euclidean value. The latter fact is often used as evidence against a local extragalactic origin for short GRB class. We demonstrate that GRB sample of which the value of <V/Vmax> deviates from the Euclidean value can be spatially confined within the low value of z. We select very short bursts (T90<0.3 sec) from the BATSE 4B catalog. The value of <V/Vmax> of the short bursts is 0.4459. Considering a conic-beam and a cylindrical beam for the luminosity function, we deduce the corresponding spatial distribution of the GRB sources. We also calculate the fraction of bursts whose redshifts are larger than a certain redshift {z'}, i.e. f> z'. We find that GRBs may be distributed near to us, despite the non-Euclidean value of <V/Vmax>. A broad and uniform beam pattern seems compatible with the magnetar model in that the magnetar model requires a small zmax.http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2002/v19n1/OJOOBS_2002_v19n1_1.pdftheorygamma rays: burstsmethods: statistical |
| spellingShingle | Heon-Young Chang Hee Il Kim On Spatial Distribution of Short Gamma-Ray Bursts from Extragalactic Magnetar Flares Journal of Astronomy and Space Sciences theory gamma rays: bursts methods: statistical |
| title | On Spatial Distribution of Short Gamma-Ray Bursts from Extragalactic Magnetar Flares |
| title_full | On Spatial Distribution of Short Gamma-Ray Bursts from Extragalactic Magnetar Flares |
| title_fullStr | On Spatial Distribution of Short Gamma-Ray Bursts from Extragalactic Magnetar Flares |
| title_full_unstemmed | On Spatial Distribution of Short Gamma-Ray Bursts from Extragalactic Magnetar Flares |
| title_short | On Spatial Distribution of Short Gamma-Ray Bursts from Extragalactic Magnetar Flares |
| title_sort | on spatial distribution of short gamma ray bursts from extragalactic magnetar flares |
| topic | theory gamma rays: bursts methods: statistical |
| url | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2002/v19n1/OJOOBS_2002_v19n1_1.pdf |
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