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题名: The gravitational-wave signal generated by a galactic population of double neutron-star binaries
作者: Yu, Shenghua1, 2; Jeffery, C. Simon3, 4
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2015-04-01
卷号: 448, 期号:2, 页码:1078-1098
关键词: gravitational waves ; binaries: close ; Galaxy: stellar content ; Galaxy: structure
DOI: 10.1093/mnras/stv059
文章类型: Article
英文摘要: We investigate the gravitational wave (GW) signal generated by a population of double neutron-star (DNS) binaries with eccentric orbits caused by kicks during supernova collapse and binary evolution. The DNS population of a standard Milky Way-type galaxy has been studied as a function of star formation history, initial mass function (IMF) and metallicity and of the binary-star common-envelope ejection process. The model provides birthrates, merger rates and total number of DNS as a function of time. The GW signal produced by this population has been computed and expressed in terms of a hypothetical space GW detector (eLISA) by calculating the number of discrete GW signals at different confidence levels, where 'signal' refers to detectable GW strain in a given frequency-resolution element. In terms of the parameter space explored, the number of DNS-originating GW signals is greatest in regions of recent star formation, and is significantly increased if metallicity is reduced from 0.02 to 0.001, consistent with Belczynski et al. Increasing the IMF power-law index (from -2.5 to -1.5) increases the number of GW signals by a large factor. This number is also much higher for models where the common-envelope ejection is treated using the alpha-mechanism (energy conservation) than when using the gamma-mechanism (angular-momentum conservation). We have estimated the total number of detectable DNS GW signals from the Galaxy by combining contributions from thin disc, thick disc, bulge and halo. The most probable numbers for an eLISA-type experiment are 0-1600 signals per year at S/N >= 1, 0-900 signals per year at S/N >= 3, and 0-570 at S/N >= 5, coming from about 0-65, 0-60 and 0-50 resolved DNS, respectively.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: WHITE-DWARF BINARIES ; MASS-RATIO DISTRIBUTION ; FORMATION HISTORY ; COMMON-ENVELOPE ; RADIO PULSARS ; SPECTROSCOPIC BINARIES ; VELOCITY DISTRIBUTION ; STELLAR EVOLUTION ; MAGELLANIC-CLOUD ; COMPACT OBJECTS
收录类别: SCI
语种: 英语
WOS记录号: WOS:000350274500004
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15780
Appears in Collections:毫米波和亚毫米波技术实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Beijing 100012, Peoples R China
3.Armagh Observ, Armagh BT61 9DG, North Ireland
4.Univ Dublin Trinity Coll, Sch Phys, Dublin 2, Ireland
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