2MTF – VI. Measuring the velocity power spectrum
نویسندگان
چکیده
منابع مشابه
A New Method of Measuring the Peculiar Velocity Power Spectrum
We show that by directly correlating the cluster kinetic Sunyaev Zeldovich (KSZ) flux, the cluster peculiar velocity power spectrum can be measured to ∼ 10% accuracy by future large sky coverage KSZ surveys. This method is almost free of systemics entangled in the usual velocity inversion method. The direct correlation brings extra information of density and velocity clustering. We utilize thes...
متن کاملA new method of measuring the cluster peculiar velocity power spectrum
We propose to use spatial correlations of the kinetic Sunyaev–Zeldovich (KSZ) flux as an estimator of the peculiar velocity power spectrum. In contrast with conventional techniques, our new method does not require measurements of the thermal SZ signal or the X–ray temperature. Moreover, this method has the special advantage that the expected systematic errors are always sub–dominant to statisti...
متن کاملPower Spectrum Shape from Peculiar Velocity Data
We constrain the velocity power spectrum shape parameter Γ in linear theory using the nine bulk–flow and shear moments estimated from four recent peculiar velocity surveys. For each survey, a likelihood function for Γ was found after marginalizing over the power spectrum amplitude σ8Ω 0.6 m using constraints obtained from comparisons between redshift surveys and peculiar velocity data. In order...
متن کاملVelocity Modification of HI Power Spectrum
The distribution of atomic hydrogen in the galactic plane is usually mapped using the Doppler shift of 21 cm emission line and this causes the modification of the observed spectrum which is frequently referred to as velocity crowding effect. We calculate HI spectrum in the velocity space and derive the observed spectrum dependence on the statistics of velocity and density fields. We show that t...
متن کاملPower Spectrum of Velocity Fluctuations in the Universe
We investigate the power spectrum of velocity fluctuations in the universe starting from four different measures of velocity: the power spectrum of velocity fluctuations from peculiar velocities of galaxies; the rms peculiar velocity of galaxy clusters; the power spectrum of velocity fluctuations from the power spectrum of density fluctuations in the galaxy distribution; and the bulk velocity f...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2017
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stx1521