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Article: Pulsed and unpulsed gamma-ray emission from millisecond pulsars
Title | Pulsed and unpulsed gamma-ray emission from millisecond pulsars |
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Authors | |
Keywords | Gamma rays: theory Pulsars: general Radiation mechanisms: nonthermal |
Issue Date | 1996 |
Publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205 |
Citation | Astrophysical Journal Letters, 1996, v. 468 n. 1 PART I, p. 207-213 How to Cite? |
Abstract | We use the outer gap model to study the gamma-ray emission and pair production processes of millisecond pulsars. The small light cylinder of millisecond pulsars results in a large optical depth for gamma rays produced inside the light cylinder. Electron/position cascade will take place until the energy of emitted gamma rays is less than a specific threshold energy (E crit). The model for the pulsed gamma-ray spectrum is F1(Eγ) ∼ Eγ -2 for Eγ ≤ E crit. Furthermore, electrons/positrons accelerated in the outer gap can continue to interact with the low-energy gamma rays beyond the light cylinder to produce very high energy gamma rays. The subsequent pair production and radiation processes can produce unpulsed high-energy photons in the energy range of the EGRET detector on board the Compton Gamma Ray Observatory with a model spectrum F 2(Eγ) ∼ Eγ∼ -3/2 for most millisecond pulsars. We have calculated the theoretical spectra of PSR J0751 + 18, PSR 1821-24, and PSR 1937+21 to illustrate our model. Unpulsed gamma-ray emission from other sources, e.g., 47 Tuc, are discussed also. © 1996. The American Astronomical Society. All rights reserved. |
Persistent Identifier | http://hdl.handle.net/10722/43178 |
ISSN | 2023 Impact Factor: 8.8 2023 SCImago Journal Rankings: 2.766 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Wei, DM | en_HK |
dc.contributor.author | Cheng, KS | en_HK |
dc.contributor.author | Lu, T | en_HK |
dc.date.accessioned | 2007-03-23T04:40:47Z | - |
dc.date.available | 2007-03-23T04:40:47Z | - |
dc.date.issued | 1996 | en_HK |
dc.identifier.citation | Astrophysical Journal Letters, 1996, v. 468 n. 1 PART I, p. 207-213 | en_HK |
dc.identifier.issn | 2041-8205 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/43178 | - |
dc.description.abstract | We use the outer gap model to study the gamma-ray emission and pair production processes of millisecond pulsars. The small light cylinder of millisecond pulsars results in a large optical depth for gamma rays produced inside the light cylinder. Electron/position cascade will take place until the energy of emitted gamma rays is less than a specific threshold energy (E crit). The model for the pulsed gamma-ray spectrum is F1(Eγ) ∼ Eγ -2 for Eγ ≤ E crit. Furthermore, electrons/positrons accelerated in the outer gap can continue to interact with the low-energy gamma rays beyond the light cylinder to produce very high energy gamma rays. The subsequent pair production and radiation processes can produce unpulsed high-energy photons in the energy range of the EGRET detector on board the Compton Gamma Ray Observatory with a model spectrum F 2(Eγ) ∼ Eγ∼ -3/2 for most millisecond pulsars. We have calculated the theoretical spectra of PSR J0751 + 18, PSR 1821-24, and PSR 1937+21 to illustrate our model. Unpulsed gamma-ray emission from other sources, e.g., 47 Tuc, are discussed also. © 1996. The American Astronomical Society. All rights reserved. | en_HK |
dc.format.extent | 1191002 bytes | - |
dc.format.extent | 12158 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.format.mimetype | text/plain | - |
dc.language | eng | en_HK |
dc.publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205 | en_HK |
dc.relation.ispartof | Astrophysical Journal Letters | en_HK |
dc.rights | The Astrophysical Journal. Copyright © University of Chicago Press. | en_HK |
dc.subject | Gamma rays: theory | en_HK |
dc.subject | Pulsars: general | en_HK |
dc.subject | Radiation mechanisms: nonthermal | en_HK |
dc.title | Pulsed and unpulsed gamma-ray emission from millisecond pulsars | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=468&spage=207&epage=213&date=1996&atitle=Pulsed+and+Unpulsed+Gamma-Ray+Emission+from+Millisecond+Pulsars | en_HK |
dc.identifier.email | Cheng, KS: hrspksc@hkucc.hku.hk | en_HK |
dc.identifier.authority | Cheng, KS=rp00675 | en_HK |
dc.description.nature | published_or_final_version | en_HK |
dc.identifier.doi | 10.1086/177683 | en_HK |
dc.identifier.scopus | eid_2-s2.0-21444441780 | en_HK |
dc.identifier.hkuros | 21110 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-21444441780&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 468 | en_HK |
dc.identifier.issue | 1 PART I | en_HK |
dc.identifier.spage | 207 | en_HK |
dc.identifier.epage | 213 | en_HK |
dc.identifier.isi | WOS:A1996VE59200019 | - |
dc.publisher.place | United Kingdom | en_HK |
dc.identifier.scopusauthorid | Wei, DM=7202908906 | en_HK |
dc.identifier.scopusauthorid | Cheng, KS=9745798500 | en_HK |
dc.identifier.scopusauthorid | Lu, T=7402684810 | en_HK |
dc.identifier.issnl | 2041-8205 | - |