Re: CMBR Dipole, which is right???

Androcles wrote:
"OG" <owen@xxxxxxxxxxxxxxxxxxx> wrote in message news:7d0gd5F29chthU1@xxxxxxxxxxxxxxxxxxxxx
Paul Stowe wrote:
On Jul 22, 9:43 am, OG <o...@xxxxxxxxxxxxxxxxxxx> wrote:
Paul Stowe wrote:
http://en.wikipedia.org/wiki/Cosmic_microwave_background_radiation
"From theCMBdata it is seen that our local group of galaxies
(the galactic cluster that includes the Solar System's Milky
Way Galaxy) appears to be moving at 627 ± 22 km/s relative to
the reference frame of theCMB(also called theCMBrest frame)
in the direction of galactic longitude l = 276 ± 3°,
b = 30 ± 3°.[59] This motion results in an anisotropy of the
data (CMBappearing slightly warmer in the direction of movement
than in the opposite direction)."
Or?
http://www.astro.ucla.edu/~wright/CMB-DT.html
"The observed dipole indicates that the Solar System is moving at
368+/-2 km/sec relative to the observable Universe in the direction
galactic longitude l=263.85o and latitude b=48.25o with an
uncertainty slightly smaller than 0.1%. "
They could both be correct

The observed dipole averaged over 12 months corresponds to the 'Solar
System' movement wrt the CMBR.

Taking into account the Solar System's movement within the galaxy and
the galaxy's movement within the local group, the Wikipedia statement
could also be correct.- Hide quoted text -

- Show quoted text -
I very much doubt that what you proposed can account for a 260 Kps
variance...

Why?
It's known that the Solar System is orbiting the centre of the galaxy with a speed of about 220 km/s, so the galaxy only needs to be moving with a relative speed of 40km/s to account for the difference. Given that the galaxy and the Andromeda galaxy have relative velocity of 300km/s this is not a particularly speedy peculiar motion.

I very much doubt that Kps is anything like km/s, whatever numbers
you put in front of them. As usual, usenet conversations drift into
confusion and stupidity.

He's using Kps in the same way that others use mph.
.

Relevant Pages

  • Re: CMBR Dipole, which is right???
    ... "The observed dipole indicates that the Solar System is moving at ... Taking into account the Solar System's movement within the galaxy ... to be otherwise highly otherwise isotropic speeds wrt to it ...
    (sci.physics)
  • Re: CMBR Dipole, which is right???
    ... "The observed dipole indicates that the Solar System is moving at ... Taking into account the Solar System's movement within the galaxy ... to be otherwise highly otherwise isotropic speeds wrt to it ...
    (sci.physics)
  • Re: CMBR Dipole, which is right???
    ... "The observed dipole indicates that the Solar System is moving at ... System' movement wrt the CMBR. ... Taking into account the Solar System's movement within the galaxy ... You imagined he was talking of speeds of over 600Kpc/s? ...
    (sci.physics)
  • Re: CMBR Dipole, which is right???
    ... Way Galaxy) appears to be moving at 627 ± ... "The observed dipole indicates that the Solar System is moving at ... System' movement wrt the CMBR. ... to be otherwise highly otherwise isotropic speeds wrt to it ...
    (sci.physics)
  • Re: CMBR Dipole, which is right???
    ... (the galactic cluster that includes the Solar System's Milky ... Way Galaxy) appears to be moving at 627 ± ... "The observed dipole indicates that the Solar System is moving at ...
    (sci.physics)