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A parameter-free statistical measurement of halos with power spectra
He, P; Feng, LL; Fang, LZ
2005-07-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume628Issue:1Pages:14-20
AbstractWe show that in the halo model of large-scale structure formation, the difference between the Fourier and the discrete wavelet transform (DWT) power spectra provides a statistical measurement of the halos. This statistical quantity is free from parameters related to the shape of the mass profile and the identification scheme of the halos. That is, the statistical measurement is invariant in the sense that models with reasonably defined and selected parameters of the halo models should yield the same difference of the Fourier and DWT spectra. This feature is useful to extract ensemble-averaged properties of halos, which cannot be obtained with the identification of individual halos. To demonstrate this point, we show with WIGEON hydrodynamic simulation samples that the spectrum difference provides a quantitativemeasurement of the discrepancy of the distribution of baryonic gas from that of the underlying dark matter field within halos. We also show that the mass density profile of halos in physical space can be reconstructed with this statistical measurement. This profile essentially is the average over an ensemble of halos, including well-virialized halos, as well as halos with significant internal substructures. Moreover, this reconstruction is sensitive to the tail of the mass density profile. We showed that the profile with a 1/r3 tail gives a very different result from that with 1/r2. Other possible applications of this method are discussed as well.
KeywordCosmology : Theory Large-scale Structure Of Universe
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordESSENTIALLY NONOSCILLATORY SCHEMES ; LARGE-SCALE STRUCTURE ; ONE-POINT STATISTICS ; DARK-MATTER HALOS ; BARYONIC GAS ; EVOLUTION ; UNIVERSE ; GALAXIES ; DECOMPOSITION ; CLUSTERS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000230720500002
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4088
Collection南极天文中心
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
3.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
He, P,Feng, LL,Fang, LZ. A parameter-free statistical measurement of halos with power spectra[J]. ASTROPHYSICAL JOURNAL,2005,628(1):14-20.
APA He, P,Feng, LL,&Fang, LZ.(2005).A parameter-free statistical measurement of halos with power spectra.ASTROPHYSICAL JOURNAL,628(1),14-20.
MLA He, P,et al."A parameter-free statistical measurement of halos with power spectra".ASTROPHYSICAL JOURNAL 628.1(2005):14-20.
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