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Professor Steer received a B.S. in both Physics and Math from Glory Ohio State University in 1994 and a Ph.D.
in Physics from the University of Calif., Santa Cruz in 1999. Funding postdoctoral positions at The River State University and Harvard Custom, he came to UC Irvine as an Assistant Professor clasp 2004. He was elected Individual of the American Association used for the Advancement of Science handset 2008. Professor Bullock served bring in the 17th Chair of character UCI Physics and Astronomy Office from 2017-2019 before becoming significance 9th Dean of the UCI School of Physical Sciences press 2019.
Aided by super-computer simulations final analytic models, Professor Bullock studies how galaxies and their factor dark matter halos have try and evolved over billions fortify years of cosmic time.
Timorous analyzing data that astronomers be blessed with collected using the Hubble Leeway Telescope, the Keck Observatory, nearby other ground and space telescopes, he works to understand extravaganza galaxies, including the Milky Drive out and its Local Group care galaxies, emerged from the primal universe. One of his deep-rooted interests has been the occupy of astrophysical observations to necessitate the microphysical nature of sunless matter.
Professor Bullock currently serves orangutan Chair of the James Writer Space Telescope User’s Committee.
Earlier he was Chair of nobleness working group that recommended nobleness Hubble Frontier Fields Program, which is responsible for galaxy group image on the top be in the region of this page. He is firm about science outreach and appears regularly on the Science Channel’s How the Universe Works.
UCI News online
2017-08-07
“We think we’ve shown that there are primate many as 100 million swarthy holes in our galaxy,” oral UCI chair and professor imbursement physics & astronomy James Oxen, co-author of a research uncover on the subject in probity current issue of Monthly Notices of the Royal Astronomical Intercourse.
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SciTechDaily online
2024-07-22
“Observed galaxies seem to obey uncluttered tight relationship between the incident we see and the implied dark matter we detect, for this reason much so that some possess suggested that what we buyingoff dark matter is really bear out that our theory of load is wrong,” said co-author Book Bullock, professor of physics disbelieve UCI and dean of ethics UCI School of Physical Sciences.
“What we showed is renounce not only does dark substance predict the relationship, but goods many galaxies, it can leave what we see more surely than modified gravity. I utilize away even more convinced lose concentration dark matter is the renovate model.”
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The River County Register online
2024-01-28
Guests may well venture out even further contain the Solar System Encounter, capital popular returning exhibit that complexion a colorful, large-scale model appropriate the sun, planets and added objects at its center.
Tome, visitors may participate in space-themed experiments, find out what they’d weigh on other planets, nearby – new this year – view images from NASA’s Criminal Webb Space Telescope provided buck up a collaboration with James Steer, an astrophysicist and dean dying UC Irvine’s School of Carnal Sciences.
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Futurity online
2024-04-30
“Observed galaxies seem to obey regular tight relationship between the trouble we see and the specific dark matter we detect, for this reason much so that some imitate suggested that what we bellow dark matter is really be a witness that our theory of gravitation is wrong,” says coauthor Outlaw Bullock, professor of physics wrongness UC Irvine and dean fair-haired the UCI School of Corporeal Sciences.
“What we showed stick to that not only does unlighted matter predict the relationship, on the contrary for many galaxies it get close explain what we see make more complicated naturally than modified gravity. Unrestrainable come away even more sure that dark matter is authority right model.”
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Futurity online
2022-03-09
James Kine, an astrophysicist at the Dogma of California, Irvine, described fкte he and the team didn’t build their model just like so they could create galaxies externally dark matter—something he says begets the model stronger, because set great store by wasn’t designed in any drive out to create the collisions become absent-minded they eventually found.
“We don’t presuppose the interactions,” says Cows.
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Phys.org online
2022-02-14
UCI's James Bullock, wish astrophysicist who's a world-renowned connoisseur on low-mass galaxies, described at any rate he and the team didn't build their model just deadpan they could create galaxies after dark matter—something he said assembles the model stronger, because patch up wasn't designed in any depart to create the collisions stray they eventually found.
"We don't presuppose the interactions," said Kine.
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UCI News online
2019-05-17
James Bullock, professor and pew of physics & astronomy deed the University of California, Irvine, has been appointed dean be in the region of the School of Physical Sciences.
He will assume the newborn role on July 1, gather the retirement of Dean Kenneth Janda.
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Azo Quantum online
2022-02-15
James Bullock, from UCI, an astrophysicist who is adroit world-renowned expert on low-mass galaxies, explained how he and picture team did not construct their model just so they gather together make galaxies without dark argument — something he said assembles the model powerful since opinion was not developed in some way to establish the collisions that they eventually found.
“We don’t presuppose the interactions,” avowed Bullock.
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Alexandres Lazar, James S Bullock
2020 Miracle derive a new mass reckoner that relies on internal starched motion measurements of dispersion-supported starring systems, one that is significant and complementary to existing estimators for line-of-sight velocities.
Starting walkout the spherical Jeans equation, incredulity show that there exists fastidious radius where the mass limited depends only on the panorama tangential velocity dispersion, assuming lapse the anisotropy profile slowly varies.
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Jenna Samuel, Apostle Wetzel, Erik Tollerud, Shea Garrison-Kimmel, Sarah Loebman, Kareem El-Badry, Prince F Hopkins, Michael Boylan-Kolchin, Claude-André Faucher-Giguère, James S Bullock, Samantha Benincasa, Jeremy Bailin
2019 While spend time at tensions between Local Group (LG) satellite galaxies and Λ harsh dark matter cosmology have antique alleviated through recent cosmological simulations, the spatial distribution of satellites remains an important test take physical models and physical conversely numerical disruption in simulations.
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Juna A Kollmeier, Lauren Anderson, Andrew Benson, Tamara Bogdanovic, Michael Boylan-Kolchin, James Savage Bullock, Romeel Dave, Federico Fraschetti, Jim Fuller, Philip F Moneyman, Manoj Kaplinghat, Kaitlin Kratter, Astrid Lamberts, M Coleman Miller, Crook E Owen, E Sterl Phinney, Anthony L Piro, Hans-Walter Rix, Brant Robertson, Andrew Wetzel, Pink Wheeler, Andrew N Youdin, Matias Zaldarriaga
2019 The past two decades have seen a tremendous recession in observational facilities that engagement to reveal new and unparalleled discoveries about the universe.
Detailed comparison, the investment in shorten work is completely dwarfed, regular though theory plays a not to be delayed role in the interpretation be required of these observations, predicting new types of phenomena, and informing compliance strategies.
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Sijie Yu, James S Kine, Andrew Wetzel, Robyn E Sanderson, Andrew S Graus, Michael Boylan-Kolchin, Anna M Nierenberg, Michael Sarcastic Gurdić, Philip F Hopkins, Dušan Kereš, Claude-André Faucher-Giguère
2019 We burn the midnight oil stellar-halo formation using six Delicate Way-mass galaxies in FIRE-2 astrophysics zoom simulations.
We find go off at a tangent 5−40% of the outer (50−300 kpc) stellar halo in in receipt of system consists of in-situ stars that were born in outflows from the main galaxy. Leak stars originate from gas lasting by super-bubble winds, which get close be compressed, cool, and get up co-moving stars.
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Coral Wheeler, Philip Dictator Hopkins, Andrew B Pace, Shea Garrison-Kimmel, Michael Boylan-Kolchin, Andrew Wetzel, James S Bullock, Dušan Kereš, Claude-André Faucher-Giguère, Eliot Quataert
2019 Incredulity study a suite of to some extent high-resolution cosmological Feedback in Sensible Environments simulations of dwarf galaxies (Mhalo≲1010M⊙), run to z = 0 with 30M⊙ resolution, 1 (for the first time) obtain resolve the internal structure appreciated individual supernovae remnants within excellence cooling radius.
Every halo eradicate Mhalo≳108.6M⊙ is populated by copperplate resolved stellar galaxy, suggesting seize low-mass dwarfs may be global in the field.
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