MilkyWay@Home Project

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Gavin Shaw
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Re: MilkyWay@Home Project

Post by Gavin Shaw » Tue Jul 06, 2010 12:31 am

05 Jul 2010:

As usual, I go out of town and the server crashes. Work should be flowing, just give the server some time to catch up.--Travis
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Re: MilkyWay@Home Project

Post by Gavin Shaw » Mon Jul 12, 2010 12:01 am

09 Jul 2010:

N-Body simulation based on data compiled by David R. Law et al. Here the simulation is shown intersecting wedge 82. For the stream animation click here.
For those interested in learning more about the origin of the Sagittarius Stream, the above animation is based on data from an N-Body simulation created by David R. Law et al. which shows how the stream may have formed. The simulation was rendered using the same engine that will be used in the MilkyWay@Home screensaver.
A MilkWay@Home team member, Ben Willet has written a brief summary about the simulation and what our next MilkyWay@Home project will be!
This visualization shows the two different components of the Milkyway@home project. The circular wedge that you see is a 2.5 degree wide stripe of SDSS data. The bright overdensity in the stripe is composed of stars that have been torn off of the Sagittarius Dwarf Galaxy (Sgr) as it orbits around the Milky Way. The main goal of the project is to analyze this data stripe to determine the most likely parameters of those stars (e.g. how wide the overdensity is, where it is going, and how many stars are in it). To accomplish this goal, each user's computer analyzes a stripe with a certain parameter set, and determines how well those parameters match the data. These results are fed into the BOINC platform, which takes actions to decide the next parameter values, and chooses the best answer.
The rest of the visualization is a prelude to an upcoming BOINC project. The stars in motion are taken from an N-body simulation of the Sgr Dwarf Galaxy. We take the currently known position and velocity of the Sgr Dwarf Galaxy and run it back in time for anywhere between 3 and 6 billion years within a gravitational field that approximates the Milky Way. We then place a spherical group of stars at that predicted location, and run it forward to the current day. The Milky Way's gravity tears apart the dwarf, causing it to flow out into long streams of stars. It is these stars that are contained within the data wedges. The ultimate goal of this project is to utilize N-body simulations over BOINC to find the best fit model for the Milky Way's gravitational field. The ability to do N-body simulations over BOINC is currently being developed by our team of astronomers and computer scientists, and will soon be available to users.
References:
Law, Johnston & Majewski ApJ 619 807L 2005. http://arxiv.org/abs/astro-ph/0407566 Cole, et al.
ApJ 683 750C 2008. http://arxiv.org/abs/0805.2121
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Re: MilkyWay@Home Project

Post by Gavin Shaw » Tue Aug 03, 2010 12:36 am

02 Aug 2010:

This thread will be continually updated with the screensaver progress in its final stages. Here is the latest screenshot of the wedge and galaxy backdrop with the current Sagittarius stream estimate provided by David R. Law et al. Adding color uses considerably more memory for pre-drawn frames along with a decrease in speed, so at this time, a trade-off would have to be made between having real-time motion and having color given that only a small portion of the CPU is dedicated to graphics. Color seems to be the popular choice so far, but additional votes are welcome.
Click here for a full size image.
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Re: MilkyWay@Home Project

Post by Gavin Shaw » Wed Aug 11, 2010 11:44 pm

11 Aug 2010:

Sorry about the recent outages. It looks like they've been doing some work on the power at RPI so they've had to bring restart the milkyway server a bit. Hopefully they're done and we won't be having so many problems!

On another note, the n-body simulation application and workunits should be going out sometime this week. More on that once I get the first workunits sent out.
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Re: MilkyWay@Home Project

Post by Gavin Shaw » Wed Aug 18, 2010 3:49 am

15 Aug 2010:

I've sent out the first set of nbody simulation workunits, so let me know if you're having any problems with them here. Currently the only application is for 64 bit OS X, so if you're not getting them that's why. I should be putting up linux applications in the next day or so, and windows applications when Matt A. gets them to me.
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Re: MilkyWay@Home Project

Post by Gavin Shaw » Wed Aug 18, 2010 3:50 am

16 Aug 2010:

It looks like the nbody simulation assimilator is up and going. I know the workunits are really short, but right now we're just testing to see if the searches can get to the known best position and trying to debug the assimilator. It's a lot easier when we have a bit more of a work flow going.
Once we have things a bit more debugged, the nbody simulation workunit times should increase quite dramatically. Right now we're simulating around 4000 bodies, but we expect to increase that to around 100,000 to 1,000,000 bodies (or more).
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Re: MilkyWay@Home Project

Post by Buga1 » Thu Feb 17, 2011 1:37 am

Gavin is User of the Day at MilkWay today. :o)

Congrats.

Rick
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Re: MilkyWay@Home Project

Post by Gavin Shaw » Thu Feb 17, 2011 8:58 am

Funny, because I don't have a profile there? Something shows on their homepage but when I click to view the profile, there is no profile to view. It tells me to create one.
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