Associate Professor of Physics & Astronomy at the University of California, Davis
NASA has selected Isaiah Santistevan for a Future Investigators in NASA Earth and Space Science and Technology (FINESST) award! This grant will fund the final 2 years of Isaiah’s PhD project: Modeling the Cosmological Evolution of Satellite Dwarf Galaxies in 6D Phase Space. Congratulations Isaiah!
The National Science Foundation (NSF) has awarded me and our group a Faculty Early Career Development Program (CAREER) grant of $800,117 for Galactic Archeology: Understanding the Building Blocks of the Milky Way across Cosmic Time.
Article from UC Davis College of Letters & Science highlights this award.
With this award, we seek to model and understand how our Milky Way and similar galaxies formed across cosmic time. We also will develop a library of interactive Jupyter notebook tutorials, based on these simulations, to promote learning in computational analysis. Thank you to all current and former members of my group, as well as the FIRE collaboration, for helping to enable this science!
NASA’s Astrophysics Theory Program (ATP) has awarded our team (PI Robyn Sanderson, co-PI Andrew Wetzel) a grant for Predicting observable signatures for dynamical interactions between dark-matter substructure and stellar streams in the Milky Way. Congratulations to Robyn Sanderson, who led this grant!
The wealth of ongoing and upcoming observations of the Milky Way promise an era of ‘near-field cosmology’ to test the cold dark matter (CDM) paradigm. One of the most exciting and powerful probes of dark matter is using the Milky Way’s stellar streams as ‘gravitational antennae’, as close passages of small dark-matter subhalos dynamically perturb cold stellar streams, allowing us to test the diverging predictions of different dark-matter models for the low-mass end of the (sub)halo mass function. Our goal with this grant is to use our Latte suite of FIRE-2 simulations of Milky Way-like galaxies to model the dynamics of dark-matter subhalo interactions with stellar streams from disrupted globular clusters and satellite galaxies in realistic detail, including creating synthetic observations of these simulated perturbed streams. Our goal is to provide the first comprehensive end-to-end study that connects cosmological predictions from baryonic simulations to interpretations of, and predictions for, observable perturbations from dark-matter subhalos on stellar streams.
Space Telescope Science Institute has awarded our team
a Hubble Space Telescope (HST) Treasury Program of 244 orbits for Tracing the 6-D Orbital and Formation History of the Complete M31 Satellite System. These Hubble Space Telescope (HST) observations will provide the initial baselines for long-term proper-motion measurements for all of the known satellite galaxies around Andromeda (M31). Our goal is to measure the orbital motions of these satellites as they move across the sky over the next ~10 years, to complete their full 6-dimensional orbital phase-space. Our key science goals are to:
Combined with our existing HST Treasury Program to measure proper motions for all of the satellite galaxies of the Milky Way, we will provide proper motions for all known satellite galaxies across the Local Group.
Space Telescope Science Institute has awarded our team
a Hubble Space Telescope (HST) Legacy Theory grant for Probing the epoch of reionization with the fossil record of nearby dwarf galaxies. Our goal is to use our FIRE-2 simulations to rigorously test and characterize how well HST near-field observations of the star-formation histories of low-mass galaxies in the Local Group can measure the faint end of the galaxy ultra-violet luminosity function during the epoch of reionization at z ~ 7. Furthermore, we will create synthetic HST and JWST observations of these simulated galaxies, to quantify how accurately the SFHs from measured stellar populations in nearby low-mass galaxies can infer their star formation rates and UV luminosities at z ~ 7, and we will release these synthetic observations and simulation data to the scientific community, to help leverage existing HST data and guide upcoming JWST observations.
The Hellman Fellows Program has selected me as a 2019 Hellman Fellow, for my proposed research program: Using stars as gravitational antennae to measure dark matter. The Hellman Fellows Program supports the research of assistant professors, and this fellowship grant will help support the work of our group to use our Latte FIRE simulations to develop new dynamical models to measure the nature of dark matter, by using streams of stars as ‘gravitational antennae’ for interactions with dark-matter subhalos, thus translating dark-matter theories directly into measurable predictions for stellar dynamics.
The Research Corporation, with support of the Heising-Simons Foundation and the Kavli Foundation, once again has selected me to be a Scialog Fellow. I was delighted again to join 50 fellows at the 2019 Scialog conference on Time Domain Astrophysics in Tuscon, Arizona, during which we discussed exciting applications of data from NASA’s TESS satellite, ESA’s Gaia satellite, and the Zwicky Transient Facility.
I am excited that the Heising-Simons Foundation selected the grant that Keith Hawkins, Jennifer van Saders, and I submitted during this meeting: Aging Gracefully: Stellar Ages Across the HR Diagram and Their Implications for Galactic Archaeology. With this seed funding, our goal is two-fold:
NASA’s Astrophysics Theory Program (ATP) has awarded our team
a grant for Modeling Galactic Archaeology of the Milky Way. Kudos in particular to Robyn Sanderson, who led a significant component of our science case. Our primary goal with this grant is to turn our Latte suite of FIRE-2 simulations of Milky Way-like galaxies into synthetic star catalogs and mock surveys of the Milky Way, and make these datasets publically available, to provide theoretical predictions and tools for the many surveys of the Milky Way, including the Gaia satellite.
Space Telescope Science Institute has awarded our team
a Hubble Space Telescope (HST) Theory grant for Understanding the physics of gas stripping and star-formation quenching of the satellite dwarf galaxies in the Local Group. Our goal is to use our Latte suite of FIRE-2 simulations to understand how satellite dwarf galaxies evolve after they fall into a host halo like the Milky Way, with emphasis on how (internal) stellar feedback and (external) environmental processes like ram-pressure stripping remove their gas and quench their star formation, as observed in the satellites of the Milky Way.
Space Telescope Science Institute has awarded our team
a Hubble Space Telescope (HST) Treasury Program of 164 orbits for Milky Way Cosmology: Laying the Foundation for Full 6-D Dynamical Mapping of the Nearby Universe. These Hubble Space Telescope (HST) observations will provide the initial baselines for long-term proper-motion measurements for all of the known satellite dwarf galaxies around the Milky Way. Our goal is to measure the orbital motions of these satellites as they move across the sky over the next 3 – 10 years, to complete their full 6-dimensional orbital phase-space. Our key science goals are to