Reconstructed density and velocity fields from the 2MASS Redshift Survey
نویسندگان
چکیده
منابع مشابه
Wiener Reconstruction of Density, Velocity, and Potential Fields from All-sky Galaxy Redshift Surveys
We present a new method for recovering the cosmological density, velocity, and potential elds from all-sky redshift catalogues. The method is based on an expansion of the elds in orthogonal radial (Bessel) and angular (spherical harmonic) functions. In this coordinate system, peculiar velocities introduce a coupling of the radial harmonics describing the density eld in redshift space but leave ...
متن کاملCosmic Flow from 2mass Redshift Survey: the Origin of Cmb Dipole and Implications for Λcdm Cosmology
We generate the peculiar velocity field for the 2MASS Redshift Survey (2MRS) catalog (Huchra et al. 2005) using an orbit-reconstruction algorithm. The reconstructed velocities of individual objects in 2MRS are well-correlated with the peculiar velocities obtained from high-precision observed distances within 3,000 km s. We estimate the mean matter density to be Ωm = 0.31±0.05 by comparing obser...
متن کاملThe inverse redshift–space operator: reconstructing cosmological density and velocity fields
We present the linear inverse redshift space operator which maps the galaxy density field derived from redshift surveys from redshift space to real space. Expressions are presented for observers in both the CMBR and Local Group rest frames. We show how these results can be generalised to flux–limited galaxy redshift surveys. These results allow the straightforward reconstruction of real space d...
متن کاملVelocity Fields from Iras–pscz Survey
We present a self–consistent nonparametric model of the cosmic velocity field based on the spatial distribution of IRAS galaxies in the recently completed all–sky PSCz redshift survey. The dense sampling of PSCz galaxies allows us to infer peculiar velocities field up to large distances with unprecedented high resolution. The most streaking feature of the PSCz model velocity field is a coherent...
متن کاملthe effect of traffic density on the accident externality from driving the case study of tehran
در این پژوهش به بررسی اثر افزایش ترافیک بر روی تعداد تصادفات پرداخته شده است. به این منظور 30 تقاطع در شهر تهران بطور تصادفی انتخاب گردید و تعداد تصادفات ماهیانه در این تقاطعات در طول سالهای 89-90 از سازمان کنترل ترافیک شهر تهران استخراج گردید و با استفاده از مدل داده های تابلویی و نرم افزار eviews مدل خطی و درجه دوم تخمین زده شد و در نهایت این نتیجه حاصل شد که تقاطعات پر ترافیک تر تعداد تصادفا...
15 صفحه اولذخیره 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: 2006
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2006.11049.x