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2MTF-VI. Measuring the velocity power spectrum

文献类型：期刊论文

作者Springob, Christopher M.1,8; Macri, Lucas M.5; Koribalski, Barbel S.4; Jones, D. Heath3; Howlett, Cullan1,8; Staveley-Smith, Lister1,8; Elahi, Pascal J.1,8; Hong, Tao7,8; Jarrett, Tom H.2; Masters, Karen L.6
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2017-11-01
卷号471期号:3页码:3135-3151
关键词Cosmological Parameters Large-scale Structure Of Universe Cosmology: Observations
DOI10.1093/mnras/stx1521
文献子类Article
英文摘要We 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).
WOS关键词2MASS REDSHIFT SURVEY ; COLD DARK-MATTER ; LARGE-SCALE STRUCTURE ; TULLY-FISHER CATALOG ; PECULIAR VELOCITIES ; BULK FLOW ; COSMOLOGICAL PARAMETERS ; LUMINOSITY FUNCTION ; SPACE DISTORTIONS ; ELLIPTIC GALAXIES
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000409035700046
资助机构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) ; 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)
源URL[http://ir.bao.ac.cn/handle/114a11/20091]  
专题国家天文台_射电天文研究部
作者单位1.Univ Western Australia, Int Ctr Radio Astron Res, Crawley, WA 6009, Australia
2.Univ Cape Town, Astron Dept, Private Bag X3, ZA-7701 Rondebosch, South Africa
3.Univ Newcastle, English Language & Fdn Studies Ctr, Callaghan, NSW 2308, Australia
4.Australia Telescope Natl Facil, CSIRO Astron & Space Sci, POB 76, Epping, NSW 1710, Australia
5.Texas A&M Univ, Dept Phys & Astron, George P & Cynthia Woods Mitchell Inst Fundamenta, 4242 TAMU, College Stn, TX 77843 USA
6.Univ Portsmouth, Inst Cosmol & Gravitat, Dennis Sciama Bldg, Portsmouth PO1 3FX, Hants, England
7.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
8.Univ Western Australia, ARC Ctr Excellence All Sky Astrophys CAASTRO, Nedlands, WA, Australia
推荐引用方式
GB/T 7714		 Springob, Christopher M.,Macri, Lucas M.,Koribalski, Barbel S.,et al. 2MTF-VI. Measuring the velocity power spectrum[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,471(3):3135-3151.
APA Springob, Christopher M..,Macri, Lucas M..,Koribalski, Barbel S..,Jones, D. Heath.,Howlett, Cullan.,...&Masters, Karen L..(2017).2MTF-VI. Measuring the velocity power spectrum.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,471(3),3135-3151.
MLA Springob, Christopher M.,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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