Back to Table of contents

Primeur weekly 2013-10-28

Special

Both citizens and scientific communities to benifit from Desktop Grid technology within the IDGF-SP project ...

Desktop Grids technically integrated into wider Grid and Cloud infrastructure for scientific computing ...

Users are now able to build their own Desktop Grid infrastructure in the Cloud ...

Exascale supercomputing

Indiana University Center scores funds for exascale supercomputing ...

The Cloud

Innovative HPC-in-the-Cloud service for China enabled by Bright Cluster Manager ...

City of Rotterdam selects Oracle HCM Cloud to help reduce costs, automate HR processes and improve HR activities ...

HP Aurasma boosts scalability and performance for augmented reality with HP Cloud ...

eMeter, a Siemens Business, provides real-time access to data analytics in the Cloud ...

Oracle buys BigMachines ...

IBM opens Federal Cloud Innovation Center in Washington, D.C. ...

EuroFlash

Notre Dame scales up HPC with Allinea Software's tools ...

ZIB and Intel have established a research centre for many-core high performance computing in Berlin ...

ZIB successfully concluded Phase I of the acceptance test of the HLRN-III Cray supercomputer ...

AMS-IX exceeds 10 Tb/s of connected capacity ...

Saarbrücken physicists aim to make transition to quantum world visible ...

New Belarus-Russian Union State programme on SKIF supercomputers possible in 2014 ...

USFlash

Univa completes acquisition of Grid Engine assets, becoming the sole commercial provider of Grid Engine software ...

Fusion-io expands relationship with Fujitsu worldwide to accelerate PRIMERGY and PRIMEQUEST servers ...

New IDC worldwide HPC end-user study identifies latest trends in high performance computing usage and spending ...

BP opens new facility in Houston to house the world's largest supercomputer for commercial research ...

New explanation for star formation: Computer simulations to provide physical explanation for Larson's Laws ...

SGI launches portfolio of new solutions to enable Big Data innovations and big breakthroughs ...

SGI empowers enterprises with Big Data innovations for big results ...

Game-changing classroom opens in library at Clemson University ...

IBM licenses new ARM technology for custom chips aimed at networking and communications ...

Oracle licenses VMware vSphere storage APIs for Oracle storage ...

NIST/JQI team gets the edge on photon transport in silicon ...

When scaling the quantum slopes, veer for the straight path ...

New explanation for star formation: Computer simulations to provide physical explanation for Larson's Laws


21 Oct 2013 San Diego - A newly published paper by three UC San Diego astrophysics researchers for the first time provides an explanation for the origin of three observed correlations between various properties of molecular clouds in the Milky Way galaxy known as Larson's Laws.

The paper, called 'A Supersonic Turbulence Origin of Larson's Laws' , was published this month in theMonthly Notices of the Royal Astronomical Society, Great Britain's pre-eminent astronomy and astrophysics journal. Larson's Laws, named so by professors teaching the three principles from the seminal 1981 paper by Richard Larson, an Emeritus Professor of Astronomy at Yale, describes the observation-based relationships of the structure and supersonic internal motions of molecular clouds where stars form.

The analysis by the UC San Diego researchers is based on recent observational measurements and data from six simulations of the interstellar medium, including effects of self-gravity, turbulence, magnetic field, and multiphase thermodynamics. The supercomputer simulations support a turbulent interpretation of Larson's relations, and the study concludes that there are not three independent Larson laws, but that all three correlations are due to the same underlying physics, i.e. the properties of supersonic turbulence.

Larson's original paper, published in the same journal, still inspires new advances in the understanding of molecular cloud structure formation and star formation.

"After decades of inconclusive debate about the interpretation of the correlations among molecular cloud properties that I published in 1981, it's gratifying to see that my original idea that they reflect a hierarchy of supersonic turbulent motions is well supported by these detailed new simulations showing that the debated complicating effects of gravity, magnetic fields, and multiphase structure do not fundamentally alter the basic picture of a turbulent cascade", stated Richard Larson in response to the new findings by the UC San Diego researchers .

"This paper is essentially the culmination of seven years of research, aided by the use of large-scale supercomputer simulations conducted at SDSC and elsewhere", stated Alexei Kritsuk, a research physicist with UC San Diego's Physics Department and Center for Astrophysics & Space Sciences (CASS) and lead author of the paper. "Molecular clouds are the birth sites for stars, so this paper relates also to the theory of star formation."

The researcher team includes Michael Norman, Director of the San Diego Supercomputer Center (SDSC) and a Distinguished Professor of physics at UC San Diego, and Christoph T. Lee, an undergraduate researcher with CASS. SDSC's Trestles and Triton clusters, and now-decommissioned DataStar system, were used to generate the simulations, as well as the Kraken and Nautilus systems at the National Institute for Computational Science (NICS), at Oak Ridge National Laboratory.

"None of these new findings and insights would have been possible without the tremendous advances in supercomputer simulations that allow not only cosmologists but scientists in countless other domains an unprecedented level of resolution and data-processing speed to further their research", stated Michael Norman, a globally recognized astrophysicist who has pioneered the use of advanced computational methods to explore the universe and its beginnings. "We believe that this paper paints the complete picture, drawing from earlier published works of ours as well as presenting new simulations that have not been published before."

The research was supported in part by National Science Foundation (NSF) grants AST-0808184, AST-0908740, AST-1109570, and XRAC allocation MCA07S014 under the NSF's Extreme Science and Engineering Discovery Environment (XSEDE) programme.
Source: University of California - San Diego

Back to Table of contents

Primeur weekly 2013-10-28

Special

Both citizens and scientific communities to benifit from Desktop Grid technology within the IDGF-SP project ...

Desktop Grids technically integrated into wider Grid and Cloud infrastructure for scientific computing ...

Users are now able to build their own Desktop Grid infrastructure in the Cloud ...

Exascale supercomputing

Indiana University Center scores funds for exascale supercomputing ...

The Cloud

Innovative HPC-in-the-Cloud service for China enabled by Bright Cluster Manager ...

City of Rotterdam selects Oracle HCM Cloud to help reduce costs, automate HR processes and improve HR activities ...

HP Aurasma boosts scalability and performance for augmented reality with HP Cloud ...

eMeter, a Siemens Business, provides real-time access to data analytics in the Cloud ...

Oracle buys BigMachines ...

IBM opens Federal Cloud Innovation Center in Washington, D.C. ...

EuroFlash

Notre Dame scales up HPC with Allinea Software's tools ...

ZIB and Intel have established a research centre for many-core high performance computing in Berlin ...

ZIB successfully concluded Phase I of the acceptance test of the HLRN-III Cray supercomputer ...

AMS-IX exceeds 10 Tb/s of connected capacity ...

Saarbrücken physicists aim to make transition to quantum world visible ...

New Belarus-Russian Union State programme on SKIF supercomputers possible in 2014 ...

USFlash

Univa completes acquisition of Grid Engine assets, becoming the sole commercial provider of Grid Engine software ...

Fusion-io expands relationship with Fujitsu worldwide to accelerate PRIMERGY and PRIMEQUEST servers ...

New IDC worldwide HPC end-user study identifies latest trends in high performance computing usage and spending ...

BP opens new facility in Houston to house the world's largest supercomputer for commercial research ...

New explanation for star formation: Computer simulations to provide physical explanation for Larson's Laws ...

SGI launches portfolio of new solutions to enable Big Data innovations and big breakthroughs ...

SGI empowers enterprises with Big Data innovations for big results ...

Game-changing classroom opens in library at Clemson University ...

IBM licenses new ARM technology for custom chips aimed at networking and communications ...

Oracle licenses VMware vSphere storage APIs for Oracle storage ...

NIST/JQI team gets the edge on photon transport in silicon ...

When scaling the quantum slopes, veer for the straight path ...