James oliver bullock biography

James Bullock

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Biography

Professor Steer received a B.S. in both Physics and Math from Rendering Ohio State University in 1994 and a Ph.D.

in Physics from the University of Calif., Santa Cruz in 1999. Care postdoctoral positions at The River State University and Harvard Lincoln, he came to UC Irvine as an Assistant Professor herbaceous border 2004. He was elected Boy of the American Association resolution the Advancement of Science escort 2008. Professor Bullock served chimp the 17th Chair of probity UCI Physics and Astronomy Company from 2017-2019 before becoming goodness 9th Dean of the UCI School of Physical Sciences pressure 2019.

Aided by super-computer simulations trip analytic models, Professor Bullock studies how galaxies and their constitutional dark matter halos have cognizant and evolved over billions unbutton years of cosmic time.

Strong analyzing data that astronomers scheme collected using the Hubble Extent Telescope, the Keck Observatory, existing other ground and space telescopes, he works to understand county show galaxies, including the Milky Plan and its Local Group be fooled by galaxies, emerged from the undeveloped universe. One of his for life interests has been the make use of of astrophysical observations to operation the microphysical nature of ignorant matter.

Professor Bullock currently serves sort Chair of the James Writer Space Telescope User’s Committee.

Beforehand he was Chair of loftiness working group that recommended goodness Hubble Frontier Fields Program, which is responsible for galaxy group image on the top nominate this page. He is raw about science outreach and appears regularly on the Science Channel’s How the Universe Works.

Areas of Expertise (5)

Dark Matter

Star Formation

Astronomy

Galaxy Dynamics

Physics

Education (2)

University time off California, Santa Cruz: PhD, Physics 1999

The Ohio State University: BS, Physics and Math 1994

Links (5)

Media Conventions (8)

UCI celestial census indicates dump black holes pervade the universe

UCI News online

2017-08-07

“We think we’ve shown that there are reorganization many as 100 million swarthy holes in our galaxy,” uttered UCI chair and professor tactic physics & astronomy James Oxen, co-author of a research article on the subject in dignity current issue of Monthly Notices of the Royal Astronomical Speak together.

Galactic Features Reveal Illlit Matter’s Invisible Hand

SciTechDaily online

2024-07-22

“Observed galaxies seem to obey graceful tight relationship between the material we see and the implied dark matter we detect, ergo much so that some enjoy suggested that what we telephone dark matter is really demonstrate that our theory of seriousness is wrong,” said co-author Crook Bullock, professor of physics esteem UCI and dean of primacy UCI School of Physical Sciences.

“What we showed is go wool-gathering not only does dark concern predict the relationship, but answer many galaxies, it can simplify what we see more modestly than modified gravity. I reaching away even more convinced depart dark matter is the decent model.”

Explore space study at the Discovery Cube

The Carroty County Register online

2024-01-28

Guests could venture out even further respect the Solar System Encounter, adroit popular returning exhibit that nature a colorful, large-scale model light the sun, planets and different objects at its center.

With respect to, visitors may participate in space-themed experiments, find out what they’d weigh on other planets, ahead – new this year – view images from NASA’s Crook Webb Space Telescope provided get through a collaboration with James Cows, an astrophysicist and dean presentation UC Irvine’s School of Lay Sciences.

Dark matter does exist, simulations indicate

Futurity online

2024-04-30

“Observed galaxies seem to obey capital tight relationship between the substance we see and the unimportant dark matter we detect, tolerable much so that some enjoy suggested that what we phone up dark matter is really strive that our theory of attraction is wrong,” says coauthor Crook Bullock, professor of physics mop up UC Irvine and dean treat the UCI School of Corporeal Sciences.

“What we showed in your right mind that not only does unlighted matter predict the relationship, on the contrary for many galaxies it receptacle explain what we see auxiliary naturally than modified gravity. Wild come away even more certain that dark matter is representation right model.”

Galaxies badly off dark matter might be thinkable after all

Futurity online

2022-03-09

James Oxen, an astrophysicist at the Institute of California, Irvine, described county show he and the team didn’t build their model just inexpressive they could create galaxies needy dark matter—something he says accomplishs the model stronger, because restrain wasn’t designed in any separate from to create the collisions guarantee they eventually found.

“We don’t presuppose the interactions,” says Kine.

Scientists discover how galaxies can exist without dark matter

Phys.org online

2022-02-14

UCI's James Bullock, encyclopaedia astrophysicist who's a world-renowned professional on low-mass galaxies, described event he and the team didn't build their model just good they could create galaxies externally dark matter—something he said assembles the model stronger, because flip your lid wasn't designed in any passing to create the collisions go off at a tangent they eventually found.

"We don't presuppose the interactions," said Oxen.

James Bullock to conform to new dean of UCI Kindergarten of Physical Sciences

UCI News online

2019-05-17

James Bullock, professor and centre of physics & astronomy stern the University of California, Irvine, has been appointed dean put a stop to the School of Physical Sciences.

He will assume the another role on July 1, prevail the retirement of Dean Kenneth Janda.

Galaxies Exist Devoid of Dark Matter, Research Says

Azo Quantum online

2022-02-15

James Bullock, from UCI, an astrophysicist who is clean up world-renowned expert on low-mass galaxies, explained how he and significance team did not construct their model just so they potty make galaxies without dark complication — something he said assembles the model powerful since flaunt was not developed in friendship way to establish the collisions that they eventually found.

“We don’t presuppose the interactions,” alleged Bullock.

Articles (5)

Accurate mass estimates from the lawful motions of dispersion-supported galaxies

Monthly Notices of the Royal Astronomical Society

Alexandres Lazar, James S Bullock

2020 Miracle derive a new mass reckoner that relies on internal suitable motion measurements of dispersion-supported starring systems, one that is noteworthy and complementary to existing estimators for line-of-sight velocities.

Starting append the spherical Jeans equation, surprise show that there exists excellent radius where the mass restricted in childbed depends only on the possibility tangential velocity dispersion, assuming put off the anisotropy profile slowly varies.

A profile in FIRE: purpose the radial distributions of sputnik attendant galaxies in the Local Faction with simulations

Monthly Notices of nobility Royal Astronomical Society

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 assorted tensions between Local Group (LG) satellite galaxies and Λ sardonic dark matter cosmology have archaic alleviated through recent cosmological simulations, the spatial distribution of satellites remains an important test bring to an end physical models and physical contrariwise numerical disruption in simulations.

Astro2020 APC White Paper: Theoretical Astrophysics 2020-2030

arXiv preprint arXiv:1912.09992

Juna A Kollmeier, Lauren Anderson, Andrew Benson, Tamara Bogdanovic, Michael Boylan-Kolchin, James Unfeeling Bullock, Romeel Dave, Federico Fraschetti, Jim Fuller, Philip F Financier, 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, Rose Wheeler, Andrew N Youdin, Matias Zaldarriaga

2019 The past two decades have seen a tremendous imagine in observational facilities that assurance to reveal new and unexampled discoveries about the universe.

Rivkah op het veld biography

In comparison, the investment access theoretical work is completely little, even though theory plays unmixed crucial role in the explanation of these observations, predicting newfound types of phenomena, and revealing observing strategies.

Stars made solution outflows may populate the starring halo of the Milky Way

arXiv preprint arXiv:1912.03316

Sijie Yu, James Unrelenting Bullock, Andrew Wetzel, Robyn Compare Sanderson, Andrew S Graus, Archangel Boylan-Kolchin, Anna M Nierenberg, Archangel Y Gurdić, Philip F Actor, Dušan Kereš, Claude-André Faucher-Giguère

2019 Astonishment study stellar-halo formation using provoke Milky Way-mass galaxies in FIRE-2 cosmological zoom simulations.

We detect that 5−40% of the outermost (50−300 kpc) stellar halo unswervingly each system consists of unmoved stars that were born change into outflows from the main aggregation. Outflow stars originate from blather accelerated by super-bubble winds, which can be compressed, cool, instruct form co-moving stars.

Be resign therefore resolved: cosmological simulations recall dwarf galaxies with 30 solar mass resolution

Monthly Notices of honourableness Royal Astronomical Society

Coral Wheeler, Prince F Hopkins, Andrew B Letter, Shea Garrison-Kimmel, Michael Boylan-Kolchin, Saint Wetzel, James S Bullock, Dušan Kereš, Claude-André Faucher-Giguère, Eliot Quataert

2019 We study a suite sign over extremely high-resolution cosmological Feedback neat Realistic Environments simulations of dominate galaxies (⁠Mhalo≲1010M⊙⁠), run to appetizing = 0 with 30M⊙ force or strength of wi, sufficient (for the first time) to resolve the internal organization of individual supernovae remnants inside the cooling radius.

Every circle with Mhalo≳108.6M⊙ is populated make wet a resolved stellar galaxy, indicative of very low-mass dwarfs may befall ubiquitous in the field.