People

Prof. Fiona Harrison

NuSTAR and UVEX PI

Prof. Fiona Harrison is the California Institute of Technology (Caltech) Benjamin M. Rosen Professor of Physics, and the Kent and Joyce Kresa Leadership Chair of the Division of Physics, Mathematics and Astronomy. Prof. Harrison’s research is focused on the study of energetic phenomena ranging from gamma-ray bursts, black holes on all mass scales, to neutron stars and supernovae. Currently she is principal investigator for NASA’s Nuclear Spectroscopic Telescope Array (NuSTAR). She received her Ph.D. in physics from the University of California, Berkeley, and went to Caltech in 1993 as a Robert A. Millikan Prize Fellow in Experimental Physics.

• fiona[at]srl[dot]caltech[dot]edu

• Fiona's Website

Staff Scientist

I am a staff scientist at the NuSTAR Science Operations Center, part of the team that operates and maintains the NuSTAR telescope. My current research interest is in X-ray transients. These are sources of X-rays that come and go that could be black holes or neutron stars undergoing a brief period of accretion, the merger of two neutron stars, supernovae, or flares from stars in our Galaxy.

• murray[at]srl[dot]caltech[dot]edu

NuSTAR Project Scientist

Hannah's primary research interest is in ultraluminous X-ray sources and other accreting X-ray binaries in nearby galaxies. They are also part of the team responsible for calibration and upkeep of the NuSTAR telescope.

• hpearn[at]caltech[dot]edu

Manager, NuSTAR Science Operations Center

Karl supervises the operation of the NuSTAR space telescope, ensuring that scientists around the world obtain the observations requested for their investigations, often leading coordination with other telescopes in space and on the ground.

• krl[at]srl[dot]caltech[dot]edu

• Karl's Website

Research Scientist

Brian works on hardware and mission development as well high energy astronomy. He is one of the principal mission scientists for NuSTAR and leads the calibration efforts. He is also the payload manager for the Ultraviolet Explorer (UVEX) NASA MIDEX responsible for delivering the wide-field UV telescope and its cameras. He uses telescopes to study a wide range of astrophysical phenomena, from the leftover remnants of exploding stars to flares from the Sun and high energy emission from X-ray binaries.

• bwgref[at]srl[dot]caltech[dot]edu

• Brian's Website

Senior Staff Scientist

I am a detector scientist for NuSTAR CZT detector as well as many other radiation detectors. I have been studying CZT/CdTe solid-state pixel detectors for NASA’s future high-energy X-ray missions as part of an APRA program. I have also participate to develop the particles detector for NASA’s STEREO and Parker Solar Probe mission. I am currently working on to develop the detector readout system for the SPHEREx mission.

• miyasaka[at]srl[dot]caltech[dot]edu

Research Scientist and Instruments System Engineer

I am a solid-state physicist working on the UVEX mission. My role encompasses detector related fabrications and characterization setups development.

• mashhadi[at]caltech[dot]edu

NuSTAR Deputy PI

I primarily study extreme supermassive black holes at a variety of wavelengths, including very distant ones, heavily enshrouded ones, and ones that are rapidly changing in brightness.

• daniel[dot]k[dot]stern[at]gmail[dot]com

Postdoctoral Research Associate

I analyze X-ray data to investigate the connection between spectral states and the geometry of accretion flows in black hole X-ray binaries (BHXBs) during outbursts, with a particular focus on the influence of mass accretion rate on this relationship. My research also explores the physics of outflows, disk winds, and obscuration commonly observed in highly inclined BHXBs, which are often transient or state-dependent phenomena. Additionally, I am deeply interested in the multi-wavelength variability characteristics of active galactic nuclei (AGN).

• oadegoke[at]caltech[dot]edu

Postdoctoral Research Associate

I study the structure and evolution of the environment surrounding growing supermassive black holes with broadband X-ray spectral analysis and multi-wavelength observations. This includes finding and classifying black holes that grow behind thick layers of obscuring material, as well as analysing the growth of black holes across a broad range of mass, luminosity and accretion rate. I'm also interested in new ways to analyse astrophysical data including parameter exploration and data visualisation.

• boorman[at]caltech[dot]edu

• Peter's Website

Postdoctoral Research Associate

I am a black hole astronomer. I study how black holes grow, evolve, and shape the universe. My focus is on the supermassive ones that power the centers of active galaxies. I investigate their behavior, ranging from the innermost regions - exceptional laboratories for studying gravity at its glory - to the more extended regions where black holes inject power and matter into their host galaxies, altering their evolution. In my research, I combine observational and modeling techniques to understand the multi-wavelength spectral and timing properties of black holes.

• ekammoun[at]caltech[dot]edu

• Elias's Website

Postdoctoral Research Associate

My main focus of research is compact objects, particularly black holes and neutron stars. I enjoy working with observations and theory, aiming to bridge the two to deepen our understanding of physics and the universe. Some particular areas I am passionate about are: accretion physics, AGN and black hole variability, multi-wavelength astronomy, jets, magnetars, and studying compact objects and transient phenomena through spectral-timing analysis, imaging and polarimetry. Most of the time I am working on developing novel timing methodologies for astronomy and applying them on accreting black holes to study time lags and variability. When I’m not doing that, I’m working on spectropolarimetry and imaging of supernova remnants, magnetars and X-ray binaries, or running simulations for upcoming high time/spectral /spatial resolution and high effective area missions, exploring their applications to physics and instrumentation design.

• demet[at]caltech[dot]edu

Visiting Postdoctoral Fellow

I am a high-energy astrophysicist and my main research focus is chasing supermassive black holes at the dawn of the Universe that power relativistic jets. I use both NASA satellites in space that explore the universe at the highest X- and gamma-ray energies, as well ground-based infrared and optical facilities, to find and study the most powerful, most distant of these sources. Among the questions I am trying to answer: how did these black grow so big so early on? How did they evolve, from then to us? What is the process of triggering these extreme relativistic jets from their cores?

• lea[dot]marcotulli[at]yale[dot]edu

• Lea's Website

Postdoctoral Research Associate

Coming from a PhD background in galaxy evolution in optical observations and cosmological simulations, I joined Caltech to study the central engines in massive galaxies - their Active Galactic Nuclei in X-ray, optical and UV wavelengths. In my research I combine conventional statistical methods with machine learning to extract information otherwise not captured from the data with standard analysis techniques. Apart from galaxies and supermassive black holes I am also interested in the development of numerical methods, in particular (pseudo-) spectral schemes applied to discontinuous problems, e.g. shock discontinuities in fluids.

• joannapk[at]caltech[dot]edu

Troesh Postdoctoral Scholar Research Associate in Physics

My research focuses on multi-messenger astrophysics (with light across the spectrum, gravitational waves, and occasionally neutrinos), and relativistic explosions. Generally I am interested in using astrophysical phenomena to probe physics that is otherwise inaccessible to terrestrial laboratories. I focus much of my time developing new space telescopes and experiments targeted at compelling astrophysical mysteries, as well as novel data analysis techniques and control systems to enhance the capabilities of existing instruments.

• tohuvavo[at]caltech[dot]edu

• Aaron's Website

Graduate Student

Black hole, neutron star…I am interested in the most powerful objects in the Universe. I have been working on X-ray binary and Active Galactic Nucleus (AGN) with X-ray satellites since I was an undergrad. My current research includes both theoretical and observational work, like modeling accretion disk reflection and studying AGN-Galaxy co-evolution with X-ray telescopes.

• yding[dot]caltech[dot]edu

• Yuanze's Website