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2MTF-VI. Measuring the velocity power spectrum
Howlett, Cullan1,2; Staveley-Smith, Lister1,2; Elahi, Pascal J.1,2; Hong, Tao2,3; Jarrett, Tom H.4; Jones, D. Heath5; Koribalski, Barbel S.6; Macri, Lucas M.7; Masters, Karen L.8; Springob, Christopher M.1,2
2017-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume471Issue:3Pages:3135-3151
AbstractWe present measurements of the velocity power spectrum and constraints on the growth rate of structure f sigma(8), at redshift zero, using the peculiar motions of 2062 galaxies in the completed 2MASS Tully-Fisher survey (2MTF). To accomplish this we introduce a model for fitting the velocity power spectrum including the effects of non-linear redshift space distortions (RSD), allowing us to recover unbiased fits down to scales k= 0.2 h Mpc(-1) without the need to smooth or grid the data. Our fitting methods are validated using a set of simulated 2MTF surveys. Using these simulations we also identify that the Gaussian distributed estimator for peculiar velocities of Watkins & Feldman is suitable for measuring the velocity power spectrum, but sub-optimal for the 2MTF data compared to using magnitude fluctuations delta m, and that, whilst our fits are robust to a change in fiducial cosmology, future peculiar velocity surveys with more constraining power may have to marginalize over this. We obtain scale-dependent constraints on the growth rate of structure in two bins, finding f sigma(8) = [0.55(-0.13)(+0.16), 0.40(-0.17)(+0.16)] in the ranges k = [0.007-0.055, 0.55-0.150] h Mpc(-)1. We also find consistent results using four bins. Assuming scale-independence we find a value f sigma(8) = 0.51(-0.08)(+0.09), a similar to 16 per cent measurement of the growth rate. Performing a consistency check of general relativity (GR) and combining our results with cosmic microwave background data only we find gamma = 0.45(-0.11)(+0.10), a remarkable constraint considering the small number of galaxies. All of our results are completely independent of the effects of galaxy bias, and fully consistent with the predictions of GR (scale-independent f sigma(8) and gamma approximate to 0.55).
SubtypeArticle
KeywordCosmological Parameters Large-scale Structure Of Universe Cosmology: Observations
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationAustralian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)(CE110001020) ; Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)(CE110001020) ; ICG ; ICG ; SEPNet ; SEPNet ; University of Portsmouth ; University of Portsmouth ; (GBT06A-027) ; (GBT06A-027) ; (GBT06B-021) ; (GBT06B-021) ; (GBT06C-049) ; (GBT06C-049) ; (GBT08B-003) ; (GBT08B-003) ; Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)(CE110001020) ; Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)(CE110001020) ; ICG ; ICG ; SEPNet ; SEPNet ; University of Portsmouth ; University of Portsmouth ; (GBT06A-027) ; (GBT06A-027) ; (GBT06B-021) ; (GBT06B-021) ; (GBT06C-049) ; (GBT06C-049) ; (GBT08B-003) ; (GBT08B-003)
DOI10.1093/mnras/stx1521
WOS Keyword2MASS REDSHIFT SURVEY ; COLD DARK-MATTER ; LARGE-SCALE STRUCTURE ; TULLY-FISHER CATALOG ; PECULIAR VELOCITIES ; BULK FLOW ; COSMOLOGICAL PARAMETERS ; LUMINOSITY FUNCTION ; SPACE DISTORTIONS ; ELLIPTIC GALAXIES
Indexed BySCI
Language英语
Funding OrganizationAustralian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)(CE110001020) ; Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)(CE110001020) ; ICG ; ICG ; SEPNet ; SEPNet ; University of Portsmouth ; University of Portsmouth ; (GBT06A-027) ; (GBT06A-027) ; (GBT06B-021) ; (GBT06B-021) ; (GBT06C-049) ; (GBT06C-049) ; (GBT08B-003) ; (GBT08B-003) ; Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)(CE110001020) ; Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)(CE110001020) ; ICG ; ICG ; SEPNet ; SEPNet ; University of Portsmouth ; University of Portsmouth ; (GBT06A-027) ; (GBT06A-027) ; (GBT06B-021) ; (GBT06B-021) ; (GBT06C-049) ; (GBT06C-049) ; (GBT08B-003) ; (GBT08B-003)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000409035700046
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20091
Collection射电天文研究部
Affiliation1.Univ Western Australia, Int Ctr Radio Astron Res, Crawley, WA 6009, Australia
2.Univ Western Australia, ARC Ctr Excellence All Sky Astrophys CAASTRO, Nedlands, WA, Australia
3.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
4.Univ Cape Town, Astron Dept, Private Bag X3, ZA-7701 Rondebosch, South Africa
5.Univ Newcastle, English Language & Fdn Studies Ctr, Callaghan, NSW 2308, Australia
6.Australia Telescope Natl Facil, CSIRO Astron & Space Sci, POB 76, Epping, NSW 1710, Australia
7.Texas A&M Univ, Dept Phys & Astron, George P & Cynthia Woods Mitchell Inst Fundamenta, 4242 TAMU, College Stn, TX 77843 USA
8.Univ Portsmouth, Inst Cosmol & Gravitat, Dennis Sciama Bldg, Portsmouth PO1 3FX, Hants, England
Recommended Citation
GB/T 7714
Howlett, Cullan,Staveley-Smith, Lister,Elahi, Pascal J.,et al. 2MTF-VI. Measuring the velocity power spectrum[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,471(3):3135-3151.
APA Howlett, Cullan.,Staveley-Smith, Lister.,Elahi, Pascal J..,Hong, Tao.,Jarrett, Tom H..,...&Springob, Christopher M..(2017).2MTF-VI. Measuring the velocity power spectrum.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,471(3),3135-3151.
MLA Howlett, Cullan,et al."2MTF-VI. Measuring the velocity power spectrum".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 471.3(2017):3135-3151.
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