Re: Dark matter

On Sep 18, 3:15 am, "Mike Dworetsky"
<platinum...@xxxxxxxxxxxxxxxxxxxx> wrote:
"Friar Broccoli" <Elia...@xxxxxxxxx> wrote in message

news:1190030500.380858.34340@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

On Sep 16, 10:31 am, "Mike Dworetsky"
<platinum...@xxxxxxxxxxxxxxxxxxxx> wrote:
"Friar Broccoli" <Elia...@xxxxxxxxx> wrote in message

news:1189942543.215372.234660@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

On Sep 16, 4:37 am, "Mike Dworetsky"
<platinum...@xxxxxxxxxxxxxxxxxxxx> wrote:

Yes other evidence for it includes the rotation of galaxies and
gravitational lensing of distant objects by clusters of galaxies.

I assume that MOND could also account for the lensing?
Presumably, if gravity is stronger for the purposes of attracting
stars and other masses, it is also stronger for producing a
gravitational lens.

I presume you could kill MOND by demonstrating lumping of
dark matter in locations different from anything detectable.
I don't recall hearing about any evidence for this. Have you?

Hmm, I think I need to check with some expert guys in my department.
IANA
cosmologist. MOND is not finished off yet, but ISTR some recent
measurements have put severe limitations on it.

Google hasn't been working quite right for usenet lately so I'm
not certain I haven't already asked you this but

Since you work in an astronomy department and are asking
something else anyway, I have a long standing request/need for
information (a citable source) on the decreasing amounts of
heavy elements in gas clouds the further out in space we look.

I read a nice simple article on this maybe five years ago, but
can no longer find it or any equivalent info on the net. As I
recall the authors used a few quasars for back lighting and then
determined what was in the clouds at various redshifts using the
hydrogen absorption lines etc as the calibration point in each
cloud.

IANAL (I am not a library). However.

You are not the first, nor I suspect the last to bang my fingers
for making this specific request, but I feel I have to keep trying.

If you do run across this info, I hope you will think of me
thou.


I'm not sure which magazine had the article you read, perhaps Scientific
American, Sky & Telescope, or something similar?

Not SA since about 6 months ago I went through all my copies of
the past 10 years (with wife hovering over me complaining about my
obsessive behavior, the importance of cutting the lawn ...) and failed
to find it. Presumably I purchased something else and failed to keep
it.

You can find lots of literature references easily on the web by using the
ADS:

http://adsabs.harvard.edu

I have already spent at least 2 full days trying this type of thing
and failed to find what I was looking for. I am sure I will try again
and will start here then.


and setting the search parameters for words in the abstract like quasar
metal absorption high redshift (use the "and" button). Something similar
for title searches may also help. Restrict the search to the last few years
or you will get "overflow".

I need it, because I like to handle the "light was faster in the
past" argument, and this is direct evidence that the light
passed through clouds that were then younger, and thus that the
light is old.

There is of course direct evidence that the fine structure constant is not
significantly variable on cosmic time/distance scales (early suggestions not
withstanding later evidence).

I seem to recall reading about that a few years back. I will follow
that lead up, to see if I can work out a simple argument from it
for creationists. (I take the view that my arguments must be
simple enough and clear enough for creationists to understand -
also helps me since I am too thick to understand the complex
stuff myself.)

Thanks

Friar Broccoli
Robert Keith Elias, Quebec, Canada Email: EliasRK (of) gmail * com
Best programmer's & all purpose text editor: http://www.semware.com

--------- I consider ALL arguments in support of my views ---------

.

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