Gilbert Holder

Theoretical astrophysics and data analysis

(bahc)
Aug 2017 - Sep 2018

2017

Y. Omori, R. Chown, G. Simard, K. T. Story, K. Aylor, E. J. Baxter, B. A. Benson, L. E. Bleem, J. E. Carlstrom, C. L. Chang, H-M. Cho, T. M. Crawford, A. T. Crites, T. de Haan, M. A. Dobbs, W. B. Everett, E. M. George, N. W. Halverson, N. L. Harrington, G. P. Holder, Z. Hou, W. L. Holzapfel, J. D. Hrubes, L. Knox, A. T. Lee, E. M. Leitch, D. Luong-Van, A. Manzotti, D. P. Marrone, J. J. McMahon, S. S. Meyer, L. M. Mocanu, J. J. Mohr, T. Natoli, S. Padin, C. Pryke, C. L. Reichardt, J. E. Ruhl, J. T. Sayre, K. K. Schaffer, E. Shirokoff, Z. Staniszewski, A. A. Stark, K. Vanderlinde, J. D. Vieira, R. Williamson, O. Zahn (2017): A 2500 deg(2) CMB Lensing Map from Combined South Pole Telescope and Planck Data, Astrophysical Journal, The American Astronomical Society, Vol 849, Num 2, pp124

2016

Yashar D. Hezaveh and Neal Dalal and Daniel P. Marrone and Yao-Yuan Mao and Warren Morningstar and Di Wen and Roger D. Blandford and John E. Carlstrom and Christopher D. Fassnacht and Gilbert P. Holder and Athol Kemball and Philip J. Marshall and Norman Murray and Laurence Perreault Levasseur and Joaquin D. Vieira and Risa H. Wechsler (2016): Detection of Lensing Substructure Using Alma Observations of the Dusty Galaxy SDP.81, Astrophysical Journal, American Astronomical Society, Vol 823, Num 1, pp37

2017

Gilbert Holder (2017): Theoretical astrophysics and data analysis, 2017 Blue Waters Annual Report, pp22-23

Mapping the skies with Blue Waters


Aug 8, 2017

Space is filled with an unseen dark energy. So confirm new measurements from data processed by the Dark Energy Survey Data Management (DESDM) project at the National Center for Supercomputing Applications (NCSA). Hosted by the University of Illinois at Urbana-Champaign (UIUC) the DESDM data verifies the theory that 26 percent of the universe is in the form of mysterious dark matter.


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Researchers map dark matter and dark energy in space


Aug 8, 2017

New measurements from data processed at the University of Illinois verify the theory that 26 percent of the universe is in the form of mysterious dark matter and that space is filled with an also-unseen dark energy, which is causing the accelerating expansion of the universe and makes up 70 percent of the universe’s contents. The new results come from data from the first year of observations of the Dark Energy Survey. These measurements of the amount and distribution of dark matter in the present-day cosmos were made with a precision that, for the first time, rivals that of measurements of the early universe captured by the European Space Agency's orbiting Planck observatory.


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New Clues to Universe Structure Revealed


Aug 7, 2017

What is our universe made of, and has its composition changed over time? Scientists have new insights about these fundamental questions, thanks to an international collaboration of more than 400 scientists called the Dark Energy Survey . Three scientists from NASAs Jet Propulsion Laboratory in Pasadena, California, are part of this group that is helping to further our understanding of the structure of the universe. The advances in astrophysics from DES are crucial to preparations for two upcoming space missions that will probe similar questions about the nature of the universe: ESA`s Euclid mission (which has significant NASA participation) and NASA`s Wide-Field Infrared Survey Telescope mission, both expected to launch in the 2020s.


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Survey reveals most accurate measurement of dark matter structure in the Universe


Aug 5, 2017

Imagine planting a single seed and, with great precision, being able to predict the exact height of the tree that grows from it. Now imagine traveling to the future and snapping photographic proof that you were right. If you think of the seed as the early universe, and the tree as the universe the way it looks now, you have an idea of what the Dark Energy Survey (DES) collaboration has just done. In a presentation at the American Physical Society Division of Particles and Fields meeting at the U.S. Department of Energy’s (DOE) Fermi National Accelerator Laboratory, DES scientists unveiled the most accurate measurement ever made of the present large-scale structure of the Universe.


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Into the Unknown: Researchers Think They've Proven the Existence of Dark Matter


Aug 5, 2017

Three scientists from NASA's Jet Propulsion Laboratory in Pasadena, California, are part of this group that is helping to further our understanding of the structure of the universe. Both will prepare scientists for future surveys, including ones with the Large Synoptic Survey Telescope (LSST). Map of dark matter made from gravitational lensing measurements of 26 million galaxies in the Dark Energy Survey.


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Most accurate measurement of universe’s dark matter unveiled


Aug 5, 2017

With a survey covering about 1/30th of the entire sky and spanning several billion light-years in extent, scientists have made the most accurate measurement of universe's dark matter. The results support the view that dark matter and dark energy make up most of the cosmos. The scientists unveiled the dark matter map in a presentation at the American Physical Society Division of Particles and Fields meeting at the US Department of Energy's (DOE) Fermi National Accelerator Laboratory.


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Astronomers Unveil Most Accurate Map Of Dark Matter In The Universe


Aug 5, 2017

New research conducted as a part of the ongoing Dark Energy Survey (DES) has used the way mass distorts light to produce a bigger, more highly detailed map of the Universe's dark matter structure. Today we can use the fact that mass changes space to "see" dark matter by measuring how light behind it distorts as it passes by, giving us a way to measure the amount and distribution of both kinds of matter across a portion of the Universe. The results are part of the Dark Energy Survey, and show how dark matter is distributed across the galaxy - scientists hitherto used models to show where it fell, largely based the Standard Model of particle physics, an incomplete theory that was nonetheless the best explanation of how matter across the universe interacts.


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Survey Provides High-Precision Measurements of Universe’s Makeup


Aug 3, 2017

New measurements – made possible by the 570-megapixel Dark Energy Camera in Chile – of the amount and “clumpiness” of dark matter in the present-day cosmos were made with a precision that rivals that of inferences from the early universe by a space telescope, the European Space Agency’s Planck observatory. The new result by the Dark Energy Survey (DES) collaboration is close to “forecasts” made from Planck measurements of the distant past, which allow scientists to understand more about the ways the universe has evolved over 14 billion years.


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University of Illinois researchers help discover ‘dark galaxy’


Apr 14, 2016

Researchers have uncovered the existence of a dwarf "dark galaxy" lurking nearly 4 billion light-years away from Earth. The discovery was made when a team of researchers, including astronomers at the University of Illinois, using the Blue Waters supercomputer at the National Center for Supercomputing Applications (NCSA), noticed subtle distortions in the image of gravitational lens SDP.81. The discovery paves the way to spot many more such objects, which could help astronomers address important questions on the true nature of dark matter.


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