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The Optical/UV Excess of X-Ray-dim Isolated Neutron Stars. I. Bremsstrahlung Emission from a Strangeon Star Atmosphere
Wang,Weiyang1,2,3; Lu,Jiguang1; Tong,Hao4; Ge,Mingyu5; Li,Zhaosheng6; Men,Yunpeng1; Xu,Renxin1,7
2017-03-06
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume837Issue:1
AbstractAbstract X-ray-dim isolated neutron stars (XDINSs) are characterized by Planckian spectra in X-ray bands, but show optical/ultraviolet (UV) excesses: the factors by which the measured photometry exceeds those extrapolated from X-ray spectra. To solve this problem, a radiative model of bremsstrahlung emission from a plasma atmosphere is established in the regime of a strangeon star. A strangeon star atmosphere could simply be regarded as the upper layer of a normal neutron star. This plasma atmosphere, formed and maintained by the interstellar-medium-accreted matter due to the so-called strangeness barrier, is supposed to be of two temperatures. All seven XDINS spectra could be well fitted by the radiative model, from optical/UV to X-ray bands. The fitted radiation radii of XDINSs are from 7 to 13 km, while the modeled electron temperatures are between 50 and 250 eV, except RX J0806.4–4123, with a radiation radius of ~3.5 km, indicating that this source could be a low-mass strangeon star candidate. This strangeon star model could further be tested by soft X-ray polarimetry, such as the Lightweight Asymmetry and Magnetism Probe, which is expected to be operational on China’s space station around 2020.
Keywordelementary particles pulsars: general radiation mechanisms: general stars: atmospheres stars: neutron
DOI10.3847/1538-4357/aa5e52
Language英语
WOS IDIOP:0004-637X-837-1-aa5e52
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/36084
Collection中国科学院国家天文台
Affiliation1.School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China; r.x.xu@pku.edu.cn
2.Key Laboratory of Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China
5.Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
6.Department of Physics, Xiangtan University, Xiangtan 411105, China
7.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China (FAST Fellow distinguished)
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang,Weiyang,Lu,Jiguang,Tong,Hao,et al. The Optical/UV Excess of X-Ray-dim Isolated Neutron Stars. I. Bremsstrahlung Emission from a Strangeon Star Atmosphere[J]. The Astrophysical Journal,2017,837(1).
APA Wang,Weiyang.,Lu,Jiguang.,Tong,Hao.,Ge,Mingyu.,Li,Zhaosheng.,...&Xu,Renxin.(2017).The Optical/UV Excess of X-Ray-dim Isolated Neutron Stars. I. Bremsstrahlung Emission from a Strangeon Star Atmosphere.The Astrophysical Journal,837(1).
MLA Wang,Weiyang,et al."The Optical/UV Excess of X-Ray-dim Isolated Neutron Stars. I. Bremsstrahlung Emission from a Strangeon Star Atmosphere".The Astrophysical Journal 837.1(2017).
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