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The gravitational-wave signal generated by a galactic population of double neutron-star binaries
Yu, Shenghua1,2; Jeffery, C. Simon3,4
2015-04-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume448Issue:2Pages:1078-1098
AbstractWe 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.
KeywordGravitational Waves Binaries: Close Galaxy: Stellar Content Galaxy: Structure
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stv059
WOS KeywordWHITE-DWARF BINARIES ; MASS-RATIO DISTRIBUTION ; FORMATION HISTORY ; COMMON-ENVELOPE ; RADIO PULSARS ; SPECTROSCOPIC BINARIES ; VELOCITY DISTRIBUTION ; STELLAR EVOLUTION ; MAGELLANIC-CLOUD ; COMPACT OBJECTS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000350274500004
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15780
Collection毫米波和亚毫米波技术实验室
Affiliation1.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
Recommended Citation
GB/T 7714
Yu, Shenghua,Jeffery, C. Simon. The gravitational-wave signal generated by a galactic population of double neutron-star binaries[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,448(2):1078-1098.
APA Yu, Shenghua,&Jeffery, C. Simon.(2015).The gravitational-wave signal generated by a galactic population of double neutron-star binaries.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,448(2),1078-1098.
MLA Yu, Shenghua,et al."The gravitational-wave signal generated by a galactic population of double neutron-star binaries".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 448.2(2015):1078-1098.
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