Say I want to calculate the comoving volume in the 2dFGRS survey: 2dFGRS

I'm using $H_{0} = 70 km s^{-1} Mpc^{-1}$ and the default values for the matter and vacuum density parameters in this calculator (Cosmological Calculator) to get a comoving volume within 2.5 z of $4.325 Gpc^{3}$.

I know that the full night sky from Earth has angular area of 41,253 square degrees.

What I'm unsure of is how to use this image to calculate the total comoving volume represented by the image, especially if the image doesn't provide the "depth" of these slices. Any ideas?


1 Answer 1


An image from the aao (see wayback) shows the design.

The North Galatic polar band has a depth of 7.5 degrees, and the South Galatictic polar band has 15 degrees, (there were also random sampling around the SGP)

enter image description here

That also gives the volume in the strips, but you should be able to confirm that by calculation.


You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .