Non-linear movement of Galaxies?

Doppler shift gives only the radial velocity. If there is also an up/down or left/right component to a galaxy's velocity relative to us we have no way to measure it at present.

BB assumes that nearly all red shift is doppler in nature (resulting from radial speed).

Meanwhile, in the real world ..

For objects within about 1000 ly we can use parallax over a period of <some time> to detect these other components.

For objects outside of that range, radial velocity may or may not be a significant part of the observed red shift. It depends on the object, and right now we just aren't sure about many of them.

LB

You should not assume redshift is caused only by velocity unless you want to join the army of people who raise the BB flag and mindlessly follow that belief. I like the idea about galaxies moving in other than radial directions. How would that motion effect redshift?

I don't. Sorry if I left that impression.

Non radial motion does not have any impact on red shift. Unless, possibly, that non radial motion is part of some mechanism that causes the object to have an intrinsic red shift.

LB

LB, I was refering to the first post here-sorry for not being clear.

<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Jim</i>
<br />You should not assume redshift is caused only by velocity unless you want to join the army of people who raise the BB flag and mindlessly follow that belief. I like the idea about galaxies moving in other than radial directions. How would that motion effect redshift?
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Jim, I too am very interested in the same question you mentioned. I accept the velocity argument because it does not necessarily crush my own argument. Although if we were to discover that certain non-radial motion also created redshift I would again be pleased, such information would be tremendous in either crushing my hypothesis or strenghtening it. That non-raidial element would have to be quantifiable to allow us to complete an accurate picture of the Universe and its motion. I am becoming increasingly interested in the shearing of galaxies as a potential identifier of non-radial motion. I have been looking at spiral galaxies and the radio wave anomolies in them.

Does anyone have any other ideas as to which telescopic image could be best used to identify such shear created by non-radial motion.