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Matthew
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Message 55119 - Posted: 13 Jul 2012, 21:32:36 UTC
Last modified: 21 Sep 2012, 21:00:46 UTC

Some pretty plots:





These are plots that I recently finished cleaning up that show the positions of the centers of the Sagittarius stream (the bases of the arrows) and the directions of the stream (arrows). The numbers represent the Sloan Digital Sky Survey stripe number of that stream detection.

The top plot is looking at the Milky Way edge-on - the dotted line is roughly the size and position of the Galactic disk.

The bottom plot is looking at the Milky Way face-on - the dotted line roughly represents the edge of the Galactic disk.

Black arrows are below the disk of the galaxy, and white arrows are above the disk. Distances are in kiloparsecs (kpc), or thousands of parsecs; a parsec is about 3.26 light-years. "Sgr Core" is th elocation of the Sagittarius Dwarf Galaxy.

As you can see, the results indicate a continuous stream that wraps all the way around the galaxy. (There are no arrows where we don't have data) Also, you can see that this stream is HUGE - its average orbital radius is as large or even larger than the radius of the Milky Way galaxy itself!

See this thread for the previous plot, which looks at the Sagittarius stream from the point of view of an observer on the Earth (which is the only point of view that we have data from, of course!)

Dataman
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Message 55130 - Posted: 14 Jul 2012, 14:03:04 UTC

Thanks for the updates, all the pretty pictures and a big welcome to Steve!!
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Message 55311 - Posted: 8 Aug 2012, 10:06:30 UTC

Oh! This is ....... AMAZING !

Big Thanx, Steve.

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Message 55312 - Posted: 8 Aug 2012, 10:20:54 UTC

Matthew, I have an idea...

Because the plots (yet so beautiful) show the vectors in their in-the-moment direction, it seems unrealistic. Because we all expect them to circulate around in curves. Maybe Thou could let server calculate the motion estimation for them and make the "arrows" round? That would look very nice I think. :)

OR

Maybe Thou coulds create a slow-motion 30 seconds Full-HD video (rotating only with motion paused, say every 7 seconds or so - like in the famous scenes in The Matrix )...
Video, where would be dark-grey-dotted Galactic disc AND the Saggitarius stream displayed in motion, (estimated motion just in very near future) calculated using the NBody engine on a supercomputer (server) ?

That would be really AWESOME! :)

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Message 55318 - Posted: 9 Aug 2012, 6:51:53 UTC
Last modified: 9 Aug 2012, 6:52:25 UTC

The first picture shows everything really well, especially after I read down and saw what the black versus white arrows meant.

Easily interpreted pictures are good and helpful.

Nice!

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Message 56201 - Posted: 15 Nov 2012, 11:54:52 UTC - in response to Message 55119.
Last modified: 15 Nov 2012, 12:03:03 UTC

Hallo!
These two graphs are realy informativ. They show the speed and direction in that the masses of the sagitarius stream are flying. They dont show how much masses, respectively energy, ist flying at each point. I donĀ“t know whether the current data will let you draw this information from it. I think, it would a give a much different view on this and be of much interest.

Kind regards and happy crunching
Martin

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Message 56419 - Posted: 7 Dec 2012, 22:48:05 UTC

Do you have a link to the paper/preprint available? I'd love to read the details.

"Never ascribe to malice that which is adequately explained by incompetence." -Napoleon
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Better is the enemy of the good. -Voltaire
Never ascribe to malice that which is adequately explained by incompetence. - Napoleon

Matthew
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Message 56421 - Posted: 7 Dec 2012, 22:58:16 UTC

We recently received the referee review (as part of the peer review process). Once we address his/her comments and hear back, we will post a more final manuscript to arXiv (http://arxiv.org/archive/astro-ph).

I very much hope that this will be done by the end of the month.


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