http://antwrp.gsfc.nasa.gov/apod/ap030209.html
(Emphasis at the end was mine.)Credit: DMR, COBE, NASA, Four-Year Sky Map
Explanation: Our Earth is not at rest. The Earth moves around the Sun. The Sun orbits the center of the Milky Way Galaxy. The Milky Way Galaxy orbits in the Local Group of Galaxies. The Local Group falls toward the Virgo Cluster of Galaxies. But these speeds are less than the speed that all of these objects together move relative to the cosmic microwave background (CMB). In the above all-sky map, radiation in the Earth's direction of motion appears blueshifted and hence hotter, while radiation on the opposite side of the sky is redshifted and colder. The map indicates that the Local Group moves at about 600 kilometers per second relative to this primordial radiation. This high speed was initially unexpected and its magnitude is still unexplained. Why are we moving so fast? What is out there?
I just noticed this image as I was looking for other things. As I looked at it, a surprising feature kind of jumped out at me. Is it just me, or is there a "bar" to this spiral? If so, what is the significance of that bar? Can this be equated to "barred spirals?"
Keeping in mind that redshift may not be a reliable indicator of velocity and/or whether things are currently approaching / receding, if Arp is correct.
What am I getting at? I'm not quite sure. Trying to tease something out of the data, I guess. I recall having read an article by plasma physicist Peratt a while back with respect to spiral galaxies in a plasma universe. I'm not sure which of his prolific papers it came out of particularly. But one of them specifically discussed spirals: normal versus barred, and even went so far as to try to pin down a reason for the "bar." IE, there was some kind of interaction between the Birkeland currents or interacting charge clouds wherein under some circumstances, they would interact across the gap between them. I just don't recall the specific circumstances. Perhaps someone can refresh me?
I thought it was one of these two, but didn't see it on first glimpse through?
http://plasmascience.net/tpu/downloadsC ... 6TPS-I.pdf
http://plasmascience.net/tpu/downloadsC ... TPS-II.pdf
In any event, that paper (which ever it was that I read) was what got my knickers in a twist over this image. That faint bar seen between the leading edges of the opposing parts of the spiral form. Maybe I'm reading too much in? Maybe not.
Cheers,
~Michael Gmirkin