The creation of the CTAO-ERIC will enable the observatory’s construction to advance rapidly and provide a framework for distributing its data worldwide, significantly accelerating its progress toward scientific discovery. On Feb. 13, 2025, the ERIC Council approved to immediately negotiate the establishment of Japan as a strategic partner and the United States, Brazil and Australia as third-party members.

“This field did not exist before 1989 when the first the gamma ray source was detected. At that point, we knew of four sources in the world,” said Dave Kieda, professor in the Department of Physics & Astronomy at the University of Utah and the CTAO spokesperson for the U.S. “The past 35 years, we went from detecting the first to now seeing several hundred. With CTAO, we’re going to see thousands. And the University of Utah is part of that legacy.”

The CTAO-ERIC was established with the international support of 11 countries and one intergovernmental organization that contributed to the technological development, construction and operation of the observatory. For Kieda, the new array will give astronomers an unprecedented view of the mysterious radiation he’s spent his career studying.

“Over the last decade, people have discovered that these high energy gamma rays are present in many, many types of very energetic astronomical phenomenon, but we don’t know much about where they come from,” Kieda said.

Read the full story by Lisa Potter in @ The U. Video above:  Animation of a gamma ray hitting Earth’s atmosphere, creating the blue Cherenkov light that flashes for a billionth of a second.

This dual achievement not only expands scientists’ understanding of the black hole population in the universe but also sets the stage for further explorations the formation of the first black holes to form in the universe and their role in galaxy evolution.

With DESI’s early data, the team was able to obtain an unprecedented dataset that includes the spectra of 410,000 galaxies, including roughly 115,000 dwarf galaxies—small, diffuse galaxies containing thousands to several billions of stars and very little gas. This extensive set would allow Pucha and her team to explore the complex interplay between black hole evolution and dwarf galaxy evolution.

While astrophysicists are fairly confident that all massive galaxies, like our Milky Way, host black holes at their centers, the picture becomes unclear as you move toward the low-mass end of the spectrum. Finding black holes is a challenge on its own but identifying them in dwarf galaxies is even more difficult due to their small sizes and the limited ability of our current instruments to resolve the regions close to these objects. An actively feeding black hole, however, is easier to spot.

“When a black hole at the center of a galaxy starts feeding, it unleashes a tremendous amount of energy into its surroundings, transforming into what we call an active galactic nucleus,” said Pucha. “This dramatic activity serves as a beacon, allowing us to identify hidden black holes in these small galaxies.”

The study is online as a pre-print ahead of publication in The Astrophysical Journal.

Read the full story by Lisa Potter in @ The U.

Tanmoy Laskar with his mentees at a radio astronomy workshop at the U in summer 2024.

The three-year initiative aims to advance the foundational science needed to realize the full potential of the Vera C. Rubin Observatory’s upcoming Legacy Survey of Space and Time (LSST).

Funded by the Research Corporation for Science Advancement (RCSA), the 21 separate awards of $60,000 in direct costs each will support a total of 20 scientists from colleges, universities, and research institutions in the United States and Canada. Laskar's team includes Igor Andreoni, Physics and Astronomy, University of North Carolina at Chapel Hill and Mathew Madhavacheril, Physics and Astronomy, University of Pennsylvania. Their research focus is titled Rubin LSST as a Multi-Wavelength Discovery Engine for Relativistic Transients.

Scialog is short for “science + dialog.” Created in 2010 by RCSA, the Scialog format aims to accelerate breakthroughs by building a creative network of scientists that crosses disciplinary silos and stimulating intensive conversation around a scientific theme of global importance. The initiative represents a fulfilling new chapter in the story of RCSA’s long-term support of the Rubin Observatory, located in north-central Chile.

exploiting a novel synergy

With his team, Laskar studies the most energetic explosions in the Universe that hurl matter in fast jets close to the speed of light. This includes gamma-ray bursts from the deaths of massive stars, merging stars that make gravitational waves and provide the Universe with its supply of heavy elements, and tidal disruption events from stars getting ripped apart by black holes. "The rarity of these extreme explosions has made them difficult to find and understand in detail," says Laskar who explains that LSST, which operates at visible wavelengths of light, will discover thousands of these every year. "Unfortunately," he continues, the rarest and most interesting events will be buried in the millions of new alerts the survey will generate every night!. Our Scialog LSST project aims to solve this problem by exploiting a novel synergy of LSST with telescope surveys built for an entirely different purpose: to study the relict microwave light from the Big Bang."

Energetic explosions produce a lot of microwaves, providing an excellent test that can distinguish them from other classes of transients. "Our team will develop tools to search for millimeter emission from candidates found by LSST in data taken by concurrently running CMB surveys in real time. Not only will this help us find the most exciting events, but knowing the millimeter brightness and polarization of these events will be essential in testing our theoretical models about how nature makes these explosions and how physics behaves under the associated extreme conditions of temperature, density, and magnetization."

The team includes members with access to precursor surveys, which will help them quickly develop and test the tools they will need on data already on hand. "

"My expertise," says Laskar, "is on modeling these explosions and extracting physics from the data."

'Taking great data'

In November, at the initiative's  inaugural conference held in Tucson, Arizona, Bob Blum, Rubin Observatory’s Director of Operations, discussed the recent successful use of the commissioning camera, which came online in October 2024.

“There's lots of challenges,” he said. “The system isn't reliable yet, but when it works, we're taking great data.”

With technical first light on the Rubin Observatory LSST Camera (the world’s largest digital camera) expected by early June 2025, full operations could start in September or October 2025. He said the first data preview should be available to researchers in March 2025, and the second in March 2026.

In time, the observatory will be able to survey the entire sky in only three nights and is expected to generate more than 20 terabytes of data each night, amassing a set of data and images that could address some of the deepest questions about the universe, its evolution, and the objects within it.

The Laskar group not only promises to help develop tools to find the most exciting events from those data made available each night, they will lead the modeling and data interpretation efforts. "I am looking forward to discovering and studying new and unusual events that will further our understanding of how physics behaves in some of the most extreme environments in the universe," says Laskar.

The Heising-Simons Foundation, The Brinson Foundation, the Leinweber Foundation, and independent philanthropist Kevin Wells are providing support to RCSA to fund the work of the eight cross-disciplinary teams.

by David Pace