185 lines
7 KiB
HTML
185 lines
7 KiB
HTML
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<div class="clearfix"></div>
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<div class="box_pad"><div class="section" id="m-density-and-peculiar-velocity-fields">
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<h2>2M++ Density and Peculiar Velocity Fields</h2>
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<p>v1.0</p>
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</div>
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<div class="section" id="please-cite">
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<h2>Please cite</h2>
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<ul class="simple">
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<li>"Cosmological parameters from the comparison of peculiar velocities with predictions from the 2M++ density field", Carrick J., Turnbull S., Lavaux G. & Hudson M. J., MNRAS, 2015. <a class="reference external" href="http://adsabs.harvard.edu/abs/2015MNRAS.450..317C">ADS</a></li>
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<div class="section" id="coordinates">
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<h2>Coordinates</h2>
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<p>The density and peculiar velocity fields are both 257 <sup>3</sup> cubes using
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the same coordinate system: configuration ("real") space
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(reconstructed so that the peculiar velocities are removed iteratively
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as described in Carrick et al 15), and smoothed with a Guassian of
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scale 4 Mpc/h.</p>
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<p>Specifically i,j,k index the 257 <sup>3</sup> data cube in Galactic Cartesian
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comoving coordinates X,Y,Z in Mpc/h, with k running fastest. The cell
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centres run from -200 to 200 Mpc/h so the grid spacing is 1.5625 Mpc/h</p>
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<p>To convert Galactic X,Y,Z use:</p>
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<div class="line-block">
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<div class="line">X = (i-128)*400./256.</div>
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<div class="line">Y = (j-128)*400./256.</div>
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<div class="line">Z = (k-128)*400./256.</div>
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</div>
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<!-- -->
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<p>The centre of the cell [0,0,0] therefore corresponds to -200,-200,-200
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and the origin (Local Group) is in the centre of cell [128,128,128].</p>
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<p>The density <span class="mathjaxlatex">\(\delta_g^*\)</span> is the luminosity-weighted density contrast.</p>
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<p>The velocities are predicted peculiar velocities in the CMB frame in
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Galactic Cartesian coordinates, generated from the <span class="mathjaxlatex">\(\delta_g^*\)</span> field with
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<span class="mathjaxlatex">\(\beta^* = 0.43\)</span> and an external dipole <span class="mathjaxlatex">\(V_\mathrm{ext} = [89,-131,17]\)</span> (Carrick et al
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Table 3) has already been added.</p>
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</div>
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<div class="section" id="download">
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<h2>Download</h2>
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<ul class="simple">
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<li><a class="reference external" href="../assets/data/twompp.txt.gz">ASCII</a> (gzipped)</li>
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<li>Numpy arrays<ul>
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<li><a class="reference external" href="../assets/data/twompp_density.npy">Density</a></li>
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<li><a class="reference external" href="../assets/data/twompp_velocity.npy">Peculiar Velocity</a></li>
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<li><a class="reference external" href="../assets/data/twompp_README.txt">README</a></li>
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</ul>
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</li>
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</ul>
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</div>
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<div id="signature">
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© 2014-2020 Guilhem Lavaux, Michael J. Hudson, Jon Carrick & Stephen Turnbull
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Please use closest mirror: <a href="http://cosmicflows.iap.fr">France</a> or <a href="http://cosmicflows.uwaterloo.ca">Canada</a>
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</div>
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<div id="last_updated">
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Last updated: 2020-09-02 16:26:42 +0200
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