دورية أكاديمية
Rapid Neutrino Cooling in the Neutron Star MXB 1659-29.
| العنوان: | Rapid Neutrino Cooling in the Neutron Star MXB 1659-29. |
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| المؤلفون: | Brown EF; Department of Physics and Astronomy, Michigan State University, 567 Wilson Road, East Lansing, Michigan 48864, USA., Cumming A; Department of Physics and McGill Space Institute, McGill University, 3600 rue University, Montreal, Quebec, Canada H3A 2T8., Fattoyev FJ; Center for Exploration of Energy and Matter and Department of Physics, Indiana University, Bloomington, Indiana 47405, USA., Horowitz CJ; Center for Exploration of Energy and Matter and Department of Physics, Indiana University, Bloomington, Indiana 47405, USA., Page D; Instituto de Astronomía, Universidad Nacional Autónoma de México, México, CDMX 04510, Mexico., Reddy S; Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195, USA. |
| المصدر: | Physical review letters [Phys Rev Lett] 2018 May 04; Vol. 120 (18), pp. 182701. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: American Physical Society Country of Publication: United States NLM ID: 0401141 Publication Model: Print Cited Medium: Internet ISSN: 1079-7114 (Electronic) Linking ISSN: 00319007 NLM ISO Abbreviation: Phys Rev Lett Subsets: PubMed not MEDLINE |
| أسماء مطبوعة: | Original Publication: New York : American Physical Society |
| مستخلص: | We show that the neutron star in the transient system MXB 1659-29 has a core neutrino luminosity that substantially exceeds that of the modified Urca reactions (i.e., n+n→n+p+e^{-}+ν[over ¯]_{e} and inverse) and is consistent with the direct Urca (n→p+e^{-}+ν[over ¯]_{e} and inverse) reaction occurring in a small fraction of the core. Observations of the thermal relaxation of the neutron star crust following 2.5 yr of accretion allow us to measure the energy deposited into the core during accretion, which is then reradiated as neutrinos, and infer the core temperature. For a nucleonic core, this requires that the nucleons are unpaired and that the proton fraction exceeds a critical value to allow the direct Urca reaction to proceed. The neutron star in MXB 1659-29 is the first with a firmly detected thermal component in its x-ray spectrum that needs a fast neutrino-cooling process. Measurements of the temperature variation of the neutron star core during quiescence would place an upper limit on the core specific heat and serve as a check on the fraction of the neutron star core in which nucleons are unpaired. |
| تواريخ الأحداث: | Date Created: 20180519 Date Completed: 20180521 Latest Revision: 20180521 |
| رمز التحديث: | 20240628 |
| DOI: | 10.1103/PhysRevLett.120.182701 |
| PMID: | 29775364 |
| قاعدة البيانات: | MEDLINE |
| تدمد: | 1079-7114 |
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| DOI: | 10.1103/PhysRevLett.120.182701 |