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Tiziana Di Matteo

Carnegie Mellon University

Extragalactic Astronomy and Cosmology

2018

Aklant K. Bhowmick, Tiziana Di Matteo, Yu Feng, Francois Lanusse (2018): The clustering of z > 7 galaxies: predictions from the BLUETIDES simulation, Monthly Notices of The Royal Astronomy Society, Vol 474, Num 4, pp5393-5405

2017

Y. Feng, and C. Modi (2017): A Fast Algorithm for Identifying Friends-of-Friends Halos, Astronomy and Computing, Elsevier BV, Vol 20, pp44--51
Di Matteo, Tiziana and Croft, Rupert A. C. and Feng, Yu and Waters, Dacen and Wilkins, Stephen (2017): The origin of the most massive black holes at high-z: BlueTides and the next quasar frontier, Monthly Notices of the Royal Astronomical Society, Oxford University Press, Vol 467, Num 4, pp4243-4251
Wilkins, Stephen M., Feng, Yu, Di Matteo, Tiziana, Croft, Rupert, Lovell, Christopher C., and Waters, Dacen (2017): The properties of the first galaxies in the BlueTides simulation, Monthly Notices of the Royal Astronomical Society, Oxford University Press, Vol 469, Num 3, pp2517-2530

2016

Dacen Waters, Stephen M. Wilkins, Tiziana Di Matteo, Yu Feng, Rupert Croft, and Daisuke Nagai (2016): Monsters in the Dark: Predictions for Luminous Galaxies in the Early Universe from the BlueTides Simulation, Monthly Notices of the Royal Astronomical Society: Letters, Oxford University Press (OUP), Vol 461, Num 1, ppL51--L55
Dacen Waters, Tiziana Di Matteo, Yu Feng, Stephen M. Wilkins, and Rupert A.C. Croft (2016): Forecasts for the WFIRST High Latitude Survey using the BlueTides Simulation, Monthly Notices of the Royal Astronomical Society, Oxford University Press, Vol 463, Num 4, pp3520-3530
Stephen M. Wilkins, Yu Feng, Tiziana Di Matteo, Rupert Croft, Elizabeth R. Stanway, Andrew Bunker, Dacen Waters, and Christopher Lovell (2016): The Photometric Properties of Galaxies in the Early Universe, Mon. Not. R. Astron. Soc., Oxford University Press (OUP), Vol 460, Num 3, pp3170--3178
Stephen M. Wilkins, Yu Feng, Tiziana Di Matteo, Rupert Croft, Elizabeth R. Stanway, Rychard J. Bouwens, and Peter Thomas (2016): The Lyman-Continuum Photon Production Efficiency in the High-Redshift Universe, Monthly Notices of the Royal Astronomical Society: Letters, Oxford University Press (OUP), Vol 458, Num 1, ppL6--L9

2015

Rupert Croft, Tiziana Di Matteo, Nishikanta Khandai, and Yu Feng (2015): Petascale Cosmology: Simulations of Structure Formation, Comput. Sci. Eng., Institute of Electrical & Electronics Engineers (IEEE), Vol 17, Num 2, pp40--46
Yu Feng, Tiziana Di Matteo, Rupert Croft, Ananth Tenneti, Simeon Bird, Nicholas Battaglia, and Stephen Wilkins (2015): The Formation of Milky Way-Mass Disk Galaxies in the First 500 Million Years of a Cold Dark Matter Universe, ApJ, The American Astronomical Society, Vol 808, Num 1, ppL17
Yu Feng, Tiziana Di Matteo, Rupert A. Croft, Simeon Bird, Nicholas Battaglia, and Stephen Wilkins (2015): The BlueTides Simulation: First Galaxies and Reionization, Mon. Not. R. Astron. Soc., Oxford University Press (OUP), Vol 455, Num 3, pp2778--2791
Yu Feng, Mark Straka, Tiziana Di Matteo, and Rupert Croft (2015): Sorting at Scale on BlueWaters in a Cosmological Simulation, presented at CUG 2015, Chicago, Illinois, U.S.A.

2013

N. Battaglia, H. Trac, R. Cen, and A. Loeb (2013): Reionization on Large Scales. I. A Parametric Model Constructed from Radiation-Hydrodynamic Simulations, ApJ, The American Astronomical Society, Vol 776, Num 2, pp81

2012

P. F. Hopkins (2012): A General Class of Lagrangian Smoothed Particle Hydrodynamics Methods and Implications for Fluid Mixing Problems, Monthly Notices of the Royal Astronomical Society, The Royal Astronomical Society, Vol 428, Num 4, pp2840--2856

2017

Tiziana Di Matteo (2017): Supermassive Black Holes at The Cosmic Frontier, 2017 Blue Waters Annual Report, pp20-21

2016

Tiziana Di Matteo (2016): The Most Massive Galaxies and Black Holes at The Cosmic Dawn of The Universe, 2016 Blue Waters Annual Report, pp47-50

2015

Tiziana Di Matteo (2015): The First Galaxies and Quasars in The BlueTides Cosmological Simulation, 2015 Blue Waters Annual Report, pp16-17

Yu Feng: First Galaxies and Quasars in the BlueTides Simulation


Blue Waters Symposium 2016, Jun 13, 2016
Yu Feng: Petascale Cosmology with Gadget: Modeling the Formation of the First Quasars with Blue Waters
Blue Waters Symposium 2014, May 13, 2014

Tiziana Di Matteo: The First Quasars


International Astronomical Union XXIX General Assembly (2015); Honolulu, Hawai'i, U.S.A., Aug 6, 2015

Tiziana Di Matteo: AGN Feedback in Simulations of Structure Formation


International Astronomical Union XXIX General Assembly (2015); Honolulu, Hawai'i, U.S.A., Aug 7, 2015

UIUC’s Supercomputer Has a Projected $1B Impact On Illinois’ Economy


May 12, 2017

Nestled on the outskirts of the University of Illinois at Urbana-Champaign campus — at the corner of Oak Street and St. Mary’s Road — is Blue Waters, a supercomputer that was first instituted as a result of a 2007 National Science Foundation grant and an initial $60 million investment from the State of Illinois. A report released this past week on the economic impact of this supercomputer — on the UIUC campus, its five surrounding counties, as well as nationwide spillover effects — puts a whole new meaning to the term “return on investment.”


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Blue Waters Study Dives Deep into Performance Details


May 2, 2017

If you’ve wondered about what, exactly, NCSA supercomputer Blue Waters has been doing since being fired up in 2013, a new report is full of details around workloads, CPU/GPU use patterns, memory and I/O issues, and a plethora of other metrics. Released in March, the study – Final Report: Workload Analysis of Blue Waters – provides a wealth of information around demand and performance. Blue Waters has supplied roughly 17.3 billion core hours to scientists to date.


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Workload study: Blue Waters enables large-scale science


Mar 31, 2017

A technical report analyzing use and performance of NCSA's Blue Waters supercomputer and all the scientific applications it has run—from its launch in April 2013, until September 2016—shows Blue Waters has spent the majority of its computing time solving large-scale scientific applications. These include projects like understanding the 160-million-atom flu virus capsid, or creating high resolution 3D maps of the Arctic from massive amounts of satellite data. The paper also shows many of these large applications could only be performed on Blue Waters. Blue Waters is housed at the National Center for Supercomputing Applications (NCSA) at the University of Illinois at Urbana-Champaign and is the largest leadership-class supercomputer funded by the National Science Foundation.


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Simulating the Early Universe


Aug 11, 2015

A new, large-scale computer simulation has shown for the first time that large disk galaxies, much like our own Milky Way, may have existed in the early days of the universe. The simulation, created by physicists at Carnegie Mellon University’s McWilliams Center for Cosmology and the University of California Berkeley, shows that the early universe —500 million years after the Big Bang — might have had more order and structure than previously thought. Their findings, which will be published in The Astrophysical Journal Letters, will help guide researchers using next-generation telescopes like the Wide Field Infrared Survey Telescope (WFIRST) and the James Webb Space Telescope (JWST) as they search the sky for evidence of the first galaxies.


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Forming Disk Galaxies Early in the Universe


Aug 5, 2015

What were galaxies like in the first 500 million years of the universe? According to simulations by Yu Feng (UC Berkeley) and collaborators, the earliest massive galaxies to form were mostly disk-shaped, rather than the compact clumps previously predicted. Current models for galaxy formation predict that small perturbations in the distribution of matter in the early universe collapsed to form very compact, irregular, clumpy first galaxies. Observations support this: the furthest out that we’ve spotted disk-shaped galaxies is at z=3, whereas the galaxies we’ve observed from earlier times — up to redshifts of z=8–10 — are very compact.


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BlueTides on Blue Waters: The First Galaxies


May 5, 2015

In this special guest feature, Dr. Stephen Perrenod writes that astrophysicists have completed one of the largest cosmological simulations ever on the Blue Waters supercomputer at NCSA. The largest high-redshift cosmological simulation of galaxy formation ever has been recently completed by a group of astrophysicists (Drs. Feng, Di-Matteo, Croft, Bird, and Battaglia) from the U.S. and the U.K. This tour-de-force simulation was performed on the Blue Waters Cray XE/XK system at NCSA and employed 648,000 cores. They utilized approximately 700 billion particles (!) to represent dark matter and ordinary matter and to create virtual galaxies inside the supercomputer. The authors, who represent Carnegie Mellon University, UC Berkeley, Princeton University, and the University of Sussex, have given their simulation the moniker BlueTides.


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