Galactic winds push researchers to probe galaxies at unprecedented scale

August 10, 2017, Oak Ridge National Laboratory
Rather than getting pushed, the simulation shows the cold material instead becomes gradually heated until it is fully incorporated into the hot wind. Credit: Credit: Evan Schneider, Princeton University

When astronomers peer into the universe, what they see often exceeds the limits of human understanding. Such is the case with low-mass galaxies—galaxies a fraction of the size of our own Milky Way.

These small, faint systems made up of millions or billions of stars, dust, and gas constitute the most common type of galaxy observed in the universe. But according to astrophysicists' most advanced models, low-mass galaxies should contain many more stars than they appear to contain.

A leading theory for this discrepancy hinges on the fountain-like outflows of gas observed exiting some galaxies. These outflows are driven by the life and death of stars, specifically stellar winds and supernova explosions, which collectively give rise to a phenomenon known as "." As star activity expels gas into intergalactic space, galaxies lose precious raw material to make new stars. The physics and forces at play during this process, however, remain something of a mystery.

To better understand how galactic wind affects star formation in galaxies, a two-person team led by the University of California, Santa Cruz, turned to high-performance computing at the Oak Ridge Leadership Computing Facility (OLCF), a US Department of Energy (DOE) Office of Science User Facility located at DOE's Oak Ridge National Laboratory (ORNL). Specifically, UC Santa Cruz astrophysicist Brant Robertson and University of Arizona graduate student Evan Schneider (now a Hubble Fellow at Princeton University), scaled up their Cholla hydrodynamics code on the OLCF's Cray XK7 Titan supercomputer to create highly detailed simulations of galactic wind.

"The process of generating galactic winds is something that requires exquisite resolution over a large volume to understand—much better resolution than other cosmological simulations that model populations of galaxies," Robertson said. "This is something you really need a machine like Titan to do."

After earning an allocation on Titan through DOE's INCITE program, Robertson and Schneider started small, simulating a hot, supernova-driven wind colliding with a cool cloud of gas across 300 light years of space. (A light year equals the distance light travels in 1 year.) The results allowed the team to rule out a potential mechanism for galactic wind.

Now the team is setting its sights higher, aiming to generate nearly a trillion-cell of an entire galaxy, which would be the largest simulation of a galaxy ever. Beyond breaking records, Robertson and Schneider are striving to uncover new details about galactic wind and the forces that regulate galaxies, insights that could improve our understanding of low-mass galaxies, dark matter, and the evolution of the universe.

Simulating cold clouds

About 12 million light years from Earth resides one of the Milky Way's closest neighbors, a disk galaxy called Messier 82 (M82). Smaller than the Milky Way, M82's cigar shape underscores a volatile personality. The galaxy produces new stars about five times faster than our own galaxy's rate of star production. This star-making frenzy gives rise to galactic wind that pushes out more gas than the system keeps in, leading astronomers to estimate that M82 will run out of fuel in just 8 million years.

Analyzing images from NASA's Hubble Space Telescope, scientists can observe this slow-developing exodus of gas and dust. Data gathered from such observations can help Robertson and Schneider gauge if they are on the right track when simulating galactic wind.

"With galaxies like M82, you see a lot of cold material at large radius that's flowing out very fast. We wanted to see, if you took a realistic cloud of cold gas and hit it with a hot, fast-flowing, supernova-driven outflow, if you could accelerate that cold material to velocities like what are observed," Robertson said.

Answering this question in high resolution required an efficient code that could solve the problem based on well-known physics, such as the motion of liquids. Robertson and Schneider developed Cholla to carry out hydrodynamics calculations entirely on GPUs, highly parallelized accelerators that excel at simple number crunching, thus achieving high-resolution results.

In Titan, a 27-petaflop system containing more than 18,000 GPUs, Cholla found its match. After testing the code on a GPU cluster at the University of Arizona, Robertson and Schneider benchmarked Cholla under two small OLCF Director's Discretionary awards before letting the code loose under INCITE. In test runs, the code has maintained scaling across more than 16,000 GPUs.

"We can use all of Titan," Robertson said, "which is kind of amazing because the vast majority of the power of that system is in GPUs."

The pairing of code and computer gave Robertson and Schneider the tools needed to produce high-fidelity simulations of gas clouds measuring more than 15 light years in diameter. Furthermore, the team can zoom in on parts of the simulation to study phases and properties of galactic wind in isolation. This capability helped the team to rule out a theory that posited close to the galaxy's center could be pushed out by fast-moving, hot wind from supernovas.

"The answer is it isn't possible," Robertson said. "The hot wind actually shreds the clouds and the clouds become sheared and very narrow. They're like little ribbons that are very difficult to push on."

Galactic goals

Having proven Cholla's computing chops, Robertson and Schneider are now planning a full-galaxy simulation about 10 to 20 times larger than their previous effort. Expanding the size of the simulation will allow the team to test an alternate theory for the emergence of galactic in disk like M82. The theory suggests that clouds of cold gas condense out of the hot outflow as they expand and cool.

"That's something that's been posited in analytical models but not tested in simulation," Robertson said. "You have to model the whole galaxy to capture this process because the dynamics of the outflows are such that you need a global simulation of the disk."

The full-galaxy simulation will likely be composed of hundreds of billions of cells representing more than 30,000 light years of space. To cover this expanse, the team must sacrifice resolution. It can rely on its detailed gas cloud simulations, however, to bridge scales and inform unresolved physics within the larger simulation.

"That's what's interesting about doing these simulations at widely different scales," Robertson said. "We can calibrate after the fact to inform ourselves in how we might be getting the story wrong with the coarser, larger simulation."

Explore further: Milky Way's origins are not what they seem

More information: Evan E. Schneider et al, HYDRODYNAMICAL COUPLING OF MASS AND MOMENTUM IN MULTIPHASE GALACTIC WINDS, The Astrophysical Journal (2017). DOI: 10.3847/1538-4357/834/2/144

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MrNewTime
Aug 10, 2017
This comment has been removed by a moderator.
cantdrive85
2.3 / 5 (6) Aug 10, 2017
HYDRODYNAMICAL COUPLING OF MASS AND MOMENTUM IN MULTIPHASE GALACTIC WINDS, The Astrophysical Journal

It's a nice story, but sadly plasma is electrodynamic which makes this hydrodynamical simulation meaningless.
If they want to understand galactic "winds" they had better start to understand galactic circuitry and that these "winds" are currents in the overall circuit.
vacuumforce
Aug 10, 2017
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Captain Stumpy
3.7 / 5 (3) Aug 10, 2017
@nazi sympathizing idiot pseudoscience eu cult preacher
... which makes this hydrodynamical simulation meaningless
your story isn't even nice, it's a sad tale of woe because you're talking pseudoscience

1- where is your replacement for the hydrodynamical simulation that is more accurate?
you have none

2- where is your replacement for plasma physics utilised?
still none

you claim it's pseudoscience all over PO despite the fact that you can't actually provide any empirical evidence for your claims

more to the point: you say they don't understand galactic winds buy you can't point to a better, more predictive and more explanatory model

pseudoscience = statements, beliefs, or practices that are claimed to be scientific and factual in the absence of evidence gathered and constrained by appropriate scientific methods

that is all you've provided: claims

you have no evidence, experimental or otherwise, so why should anyone believe you?
Da Schneib
5 / 5 (1) Aug 11, 2017
We had a recent article here on a paper that did some simulations that seem to show that low-mass galaxies generally tend to eject dust and gas into the interstellar medium (ISM), but high-mass galaxies (like the Milky Way, M31, and M33 in Triangulum, to name the three closest massive galaxies) tend not only to accrete it from the ISM but also tend to re-absorb the "galactic wind" they previously emitted. The paper looked pretty good to me. The article on this site is here: https://phys.org/...lky.html The current article seems to be confirming part of this, too.

Accreting evidence. ;)

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