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Article: Surface photon emissivity of bare strange stars

TitleSurface photon emissivity of bare strange stars
Authors
KeywordsDense matter
Elementary particles
Radiation mechanisms: nonthermal
Issue Date2003
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2003, v. 596 n. 1 I, p. 451-463 How to Cite?
AbstractWe consider the bremsstrahlung surface photon emissivity of strange quark stars, by systematically taking into account the effects of the multiple scatterings of highly relativistic quarks in a dense medium (the Landau-Pomeranchuk-Migdal effect). Because of interference between amplitudes of nearby interactions, the bremsstrahlung emissivity from a strange star surface is suppressed for frequencies smaller than a critical frequency. The range of the suppressed frequencies is a function of the quark matter density at the star's surface and of the QCD coupling constant. For temperatures much smaller than the Fermi energy of the quarks, the bremsstrahlung spectrum has the same temperature dependence as equilibrium blackbody radiation. Multiple collisions could reduce by an order of magnitude the intensity of the bremsstrahlung radiation. The effect of the thin electron layer at the surface of the quark star on the bremsstrahlung spectrum is also analyzed in detail. It is shown that absorption in the semidegenerate electron gas can also significantly reduce the intensity of the quark-quark bremsstrahlung radiation and, consequently, the surface radiation of the quark star. Hence, the combined effects of multiple collisions and absorption in the electron layer could make the soft photon surface radiation of quark stars 6 orders of magnitude smaller than equilibrium blackbody radiation.
Persistent Identifierhttp://hdl.handle.net/10722/43407
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorHarko, Ten_HK
dc.date.accessioned2007-03-23T04:45:07Z-
dc.date.available2007-03-23T04:45:07Z-
dc.date.issued2003en_HK
dc.identifier.citationAstrophysical Journal Letters, 2003, v. 596 n. 1 I, p. 451-463en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43407-
dc.description.abstractWe consider the bremsstrahlung surface photon emissivity of strange quark stars, by systematically taking into account the effects of the multiple scatterings of highly relativistic quarks in a dense medium (the Landau-Pomeranchuk-Migdal effect). Because of interference between amplitudes of nearby interactions, the bremsstrahlung emissivity from a strange star surface is suppressed for frequencies smaller than a critical frequency. The range of the suppressed frequencies is a function of the quark matter density at the star's surface and of the QCD coupling constant. For temperatures much smaller than the Fermi energy of the quarks, the bremsstrahlung spectrum has the same temperature dependence as equilibrium blackbody radiation. Multiple collisions could reduce by an order of magnitude the intensity of the bremsstrahlung radiation. The effect of the thin electron layer at the surface of the quark star on the bremsstrahlung spectrum is also analyzed in detail. It is shown that absorption in the semidegenerate electron gas can also significantly reduce the intensity of the quark-quark bremsstrahlung radiation and, consequently, the surface radiation of the quark star. Hence, the combined effects of multiple collisions and absorption in the electron layer could make the soft photon surface radiation of quark stars 6 orders of magnitude smaller than equilibrium blackbody radiation.en_HK
dc.format.extent311003 bytes-
dc.format.extent122136 bytes-
dc.format.extent12158 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.rightsThe Astrophysical Journal. Copyright © University of Chicago Press.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectDense matteren_HK
dc.subjectElementary particlesen_HK
dc.subjectRadiation mechanisms: nonthermalen_HK
dc.titleSurface photon emissivity of bare strange starsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=596&issue=1 pt 1&spage=451&epage=463&date=2003&atitle=Surface+Photon+Emissivity+of+Bare+Strange+Starsen_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.emailHarko, T: harko@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.identifier.authorityHarko, T=rp01333en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1086/377711en_HK
dc.identifier.scopuseid_2-s2.0-0142168019en_HK
dc.identifier.hkuros85372-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0142168019&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume596en_HK
dc.identifier.issue1 Ien_HK
dc.identifier.spage451en_HK
dc.identifier.epage463en_HK
dc.identifier.isiWOS:000185814300038-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.scopusauthoridHarko, T=7006485783en_HK

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