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New Study Reveals Black Hole Spin Determination Challenged by Model Uncertainty

New Study Reveals Black Hole Spin Determination Challenged by Model Uncertainty

A recent study involving scientists from the Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences and the University of Lodz has found that the perceived spin rate of the black hole in the Cygnus X-1 system is highly dependent on the physical model used to interpret X-ray radiation data. Previous analyses suggested this black hole spun at nearly the fastest physically possible speed. However, by reanalyzing observations from the XRISM X-ray mission, along with simultaneous measurements from the NICER and NuSTAR telescopes, researchers discovered that while a simple model yielded a spin value of approximately 0.99 (on a scale where one is maximum spin), more detailed models produced values ranging from zero to 0.17. When data from all three telescopes were combined, virtually any spin value became possible. This discrepancy arises because the method of inferring black hole spin relies on radiation emitted by orbiting material, and the interpretation of this radiation is significantly in...

NASA Advances PRIMA Far-Infrared Telescope to Next Development Phase

NASA Advances PRIMA Far-Infrared Telescope to Next Development Phase

NASA has announced that the Probe far-Infrared Mission for Astrophysics (PRIMA) is moving into Phase B of its development. This mission represents the first in a new class of astrophysics missions, known as Probe Explorers, within NASA's established Explorers Program. PRIMA is designed to conduct deep and sensitive surveys of the universe using far-infrared light. The mission aims to bridge the observational gap between existing infrared observatories, such as the James Webb Space Telescope, and radio telescopes. By focusing on radiant energy detectable only in the far-infrared spectrum, PRIMA will investigate a broad range of cosmic questions. These include the origins of exoplanets, the growth and evolution of galaxies and their black holes throughout cosmic history, and the accumulation of dust and heavy elements in the universe over time. The project cost for PRIMA is capped at $1.2 billion, excluding launch and other non-project expenses. If confirmed, the observatory is slated for a 2033 launch, with...

Black Hole Jets Influence Galaxy Evolution by Suppressing Star Formation

Black Hole Jets Influence Galaxy Evolution by Suppressing Star Formation

New research published in The Astrophysical Journal Letters, led by astronomers Sanchayeeta Borthakur of Arizona State University and Namrata Roy of the Raman Research Institute, provides evidence that narrow jets of heated plasma emitted by supermassive black holes significantly impact the evolution of galaxies. These jets disrupt the circumgalactic medium (CGM), a vast envelope of gas surrounding galaxies, preventing it from cooling and forming new stars. The study, which combined observations from hundreds of galaxies using data from the Dark Energy Spectroscopic Instrument (DESI) survey and radio jet measurements from the LOFAR Two-meter Sky Survey (LoTSS), found that the jets do not affect the gas uniformly. Instead, they create a distinct impression by causing the gas to shine and become ionized primarily along the radio jet's path. This ionization is brightest near the galaxy where the jet first interacts with the CGM and further out near the CGM's outer edge, where the jet releases most of its ener...

Black Hole 'Burps' Exhibit Consistent Physics Regardless of Size, New Research Suggests

Black Hole 'Burps' Exhibit Consistent Physics Regardless of Size, New Research Suggests

New research indicates that the 'burps' emitted by black holes when they feed on stars are remarkably similar, irrespective of the black hole's size. This finding, which has been difficult to test due to the vast timescales over which supermassive black holes evolve, was made possible by studying tidal disruption events (TDEs). TDEs occur when a star gets too close to a black hole and is 'spaghettified' by immense tidal forces. During this process, the black hole 'spills' a significant amount of stellar material, which is then channeled to its poles and blasted out as near-light-speed jets, referred to as 'burps.' Andrew Mummery of the Institute for Advanced Study (IAS) School of Natural Sciences and Adelle J. Goodwin studied a sample of 20 TDEs using telescope data across various electromagnetic radiation wavelengths. They discovered that jet-launching occurs in two distinct phases: immediately after extreme feeding and much later, when the black hole's feeding drops to 2% of the Eddington limit. This 2% ...

Roaming Black Holes Offer New Insights into Galaxy Evolution and Origins

Roaming Black Holes Offer New Insights into Galaxy Evolution and Origins

Astronomers Emma Jane Weller and Priyamvada Natarajan from Yale University, along with Colin Burke from the University of North Texas, have published a new study in The Astrophysical Journal Letters suggesting that 'wandering black holes' can provide crucial information about the origins and evolution of galaxies. Traditionally, black holes are thought to reside at the centers of galaxies. However, this research indicates that galactic mergers can displace black holes, causing them to wander far from their original positions for billions of years. This phenomenon is particularly pronounced in smaller galaxies, where weaker gravitational fields make it harder for displaced black holes to return to the center. The team utilized the ASTRID cosmological simulation, which tracks the evolution of dark matter, gas, stars, and black holes over 12.6 billion years, to distinguish between centered and wandering black holes. The simulation revealed that low-mass galaxies are more likely to host wandering black holes, ...

NASA Advances PRIMA Mission for Far-Infrared Astrophysics, Involving University of Maryland Astronomers

NASA Advances PRIMA Mission for Far-Infrared Astrophysics, Involving University of Maryland Astronomers

NASA has selected the PRobe far-Infrared Mission for Astrophysics (PRIMA) to advance to Phase B of its development, a stage focused on preliminary design and technology development. This mission, co-developed by University of Maryland (UMD) astronomers, aims to measure far-infrared radiation with unprecedented sensitivity. PRIMA is designed to bridge the observational gap between existing infrared observatories, such as the James Webb Space Telescope, and radio telescopes. The mission, managed by the NASA Jet Propulsion Laboratory (JPL) with contributions from NASA's Goddard Space Flight Center, NASA’s Marshall Space Flight Center, and international partners, is projected to launch in 2033 for a five-year duration. UMD Astronomy Professor Alberto Bolatto is a co-investigator leading research on galaxy evolution, while UMD Astronomy Professor Sylvain Veilleux is a science working group lead for research on active galactic nuclei. The project cost is capped at $1.2 billion, excluding launch and other non-pro...

Astronomers Discover First Confirmed Microblazar in Milky Way, Offering Clues to Cosmic Ray Origins

Astronomers Discover First Confirmed Microblazar in Milky Way, Offering Clues to Cosmic Ray Origins

Astronomers have identified IRAS 18293−0941 as the Milky Way's first confirmed microblazar, a miniature version of the powerful cosmic objects found at the centers of distant galaxies. This system consists of a black hole, estimated to be about ten times the mass of the sun, actively siphoning material from a massive companion star. As this material forms a swirling disk around the black hole, powerful magnetic fields launch two opposing jets into space. One of these jets is pointed almost directly towards Earth, carrying matter at approximately 75% the speed of light, while the other impacts an enormous cloud of interstellar gas in the opposite direction. The object, initially detected in 1983 by the Infrared Astronomical Satellite (IRAS), remained largely unstudied due to obscuring interstellar dust. An international team, led by Josep Martí of the University of Jaén in Spain, used the European VLBI Network and data from the European Space Agency’s Gaia spacecraft to confirm the jet's origin within the s...

New Study Suggests Earth's Closest Alien Life Likely Microbial, Not Advanced

New Study Suggests Earth's Closest Alien Life Likely Microbial, Not Advanced

A recent study published in the International Journal of Astrobiology indicates that extraterrestrial life on exoplanets closest to Earth is probably not highly advanced. Researchers suggest that even older exoplanets, such as TRAPPIST-1e, located approximately 40 light-years away, may only be at a microbial stage of evolution, significantly less developed than Earth's current state. This finding challenges the common assumption that older planets would have had more time to foster advanced life forms. The study's authors, including Cameron Hrabak, a co-author, examined 29 exoplanet neighbors previously identified as potentially having liquid water. They incorporated exoplanet climate simulation maps detailing variables like light, precipitation, and temperature. Their calculations for TRAPPIST-1e showed it possesses only 21 percent of Earth's total fixed carbon, a key indicator for complex life. This research suggests that the mere presence of liquid water does not guarantee the development of advanced ex...

NASA's Chandra Observatory Reveals Diverse Galactic Evolution Through X-ray Imaging

NASA's Chandra Observatory Reveals Diverse Galactic Evolution Through X-ray Imaging

NASA’s Chandra X-ray Observatory has released a new collection of 16 images showcasing galaxies in various stages of their life cycles, from peaceful star factories to cosmic wrecking grounds. These images combine decades of Chandra observations with data from other observatories, including NASA’s James Webb and Hubble Space Telescopes. While visible light reveals stars and dust, X-rays detected by Chandra highlight violent activities within galaxies, such as gas heated to millions of degrees, stellar remnants, and material energized by growing supermassive black holes. These phenomena are crucial for shaping galaxies and distributing chemical elements into space. The gallery includes examples of spiral, elliptical, and irregular galaxies, illustrating how collisions, intense star formation, and powerful black hole jets influence galactic structure and evolution.

Astronomers Detect Radio Signals from Exoplanet Beta Pictoris b, Indicating Strong Magnetic Field

Astronomers Detect Radio Signals from Exoplanet Beta Pictoris b, Indicating Strong Magnetic Field

An international team of astronomers, utilizing South Africa’s MeerKAT radio telescope array, has successfully detected direct radio wave emissions originating from Beta Pictoris b, a massive gas giant exoplanet located approximately 63 light-years from Earth. This marks the first time a radio signal has been confirmed as coming from a single exoplanet, rather than from an entire star system. The discovery allows researchers to calculate the strength of Beta Pictoris b's magnetic field, which is thousands of times stronger than Earth's. The physics behind these signals is similar to the mechanisms that create auroral displays on planets within our Solar System, where energetic, charged particles spiral along magnetic field lines towards a planet's polar regions, exciting atmospheric particles.

Astronomers Discover Universal Rule Governing Black Hole Jet Formation Across All Sizes

Astronomers Discover Universal Rule Governing Black Hole Jet Formation Across All Sizes

An international team of astronomers, co-led by Andrew Mummery of the Institute for Advanced Study and Adelle Goodwin of Curtin University, has identified a universal rule that dictates the production of powerful jets from black holes. This rule applies to black holes of all sizes, from stellar-mass black holes (approximately ten times the mass of our sun) to supermassive black holes (millions of times heavier). The research, published in Nature Astronomy, focused on tidal disruption events (TDEs), where a star passes too close to a supermassive black hole and is torn apart by intense gravitational forces. These events provide a unique opportunity to observe black hole behavior after a sudden influx of stellar material. The study combined years of observations from telescopes across multiple wavelengths, including optical, ultraviolet, X-ray, and radio waves, from various locations globally and in space. The team analyzed ten high-quality TDEs to determine the black hole's feeding rate and the timing of it...

The Knoxville News-Sentinel

Counting the years until Our Favorite Planet goes kaput | Sam Venable

Counting the years until Our Favorite Planet goes kaput | Sam Venable

Sam Venable writes: The problem is with an asteroid named Bennu that is racing through outer space at bazillions of miles per hour.