Chandra X-ray Observatory Releases Updated Source Catalog, Astrosphere Imagery, and New Sonifications

NASA's Chandra X-ray Observatory has released an updated version of its comprehensive Chandra Source Catalog (CSC 2.1), alongside new X-ray observations detailing an astrosphere around a young, Sun-like star, HD 61005. The observatory also made public several sonifications, translating X-ray data into sound, including a full-sky compilation from its catalog and separate interpretations of Jupiter, Saturn, and Uranus.

These releases provide new data and perspectives on cosmic phenomena and the solar system.

Chandra Source Catalog Update

The latest iteration of the Chandra Source Catalog, CSC 2.1, incorporates all X-ray data collected by Chandra through the end of 2020. This catalog contains over 400,000 unique compact and extended X-ray sources and more than 1.3 million individual detections. It provides detailed information, including precise sky positions and detected X-ray energies, which can be combined with observations from other telescopes, such as NASA's James Webb and Hubble Space Telescopes, for multi-wavelength studies.

The scope of CSC 2.1 is illustrated by a new image of the Galactic Center, the region encompassing the supermassive black hole Sagittarius A* in the Milky Way. This image, spanning approximately 60 light-years, displays over 3,300 individual X-ray sources and is a composite of 86 observations, representing over three million seconds of Chandra observing time. The catalog is accessible online.

Full-Sky X-ray Sonification

A new sonification has been released, converting 22 years of Chandra's full-sky X-ray observations, from its launch through 2021, into sound. This auditory representation uses different notes to indicate repeat X-ray sightings of sources over time.

The sonification video projects the sky similar to a world map, with the Milky Way's core positioned at the center and the Galactic plane horizontally. Each detection is marked by a circle, with its size reflecting the number of detections in that location over time. A year counter tracks the observations, extending beyond 2021 as Chandra continues operations, with background images produced by Chandra fading in throughout the video.

Discovery of Astrosphere Around Star HD 61005

Astronomers utilizing the Chandra X-ray Observatory have captured the first X-ray image of an astrosphere surrounding HD 61005, a young star similar to the Sun. An astrosphere is a bubble of hot gas formed by stellar winds interacting with cooler galactic gas and dust. Our Sun has a similar structure, the heliosphere. This observation is reported to offer insights into the early behavior and evolution of Sun-like stars.

HD 61005 is located approximately 120 light-years from Earth. It shares similar mass and temperature with the Sun but is significantly younger, estimated to be around 100 million years old compared to the Sun’s approximately 4.6 to 5 billion years. Its stellar wind is three times faster and approximately 25 times denser than the Sun's current wind, believed to be indicative of the Sun's activity billions of years ago. The interstellar medium around HD 61005 is about a thousand times denser than that surrounding the Sun.

Chandra detected the astrosphere through X-rays produced when the star's powerful stellar wind collides with the dense local interstellar dust and gas. The astrosphere of HD 61005 has a diameter approximately 200 times the distance from Earth to the Sun. The star has been nicknamed the “Moth” due to surrounding dust that forms patterns resembling moth wings in infrared views.

Carey Lisse of Johns Hopkins University, who led the study, stated:

"This external view provides information about the Sun's heliosphere and its evolution."

Scott Wolk of the Center for Astrophysics | Harvard & Smithsonian noted the image provides data on the Sun's early wind characteristics, which can inform understanding of space travel. The findings have been accepted for publication in The Astrophysical Journal.

Planetary X-ray Sonifications

On February 25, the Chandra X-ray Observatory also released new sonifications of X-ray data from Jupiter, Saturn, and Uranus.

These sonifications convert astronomical data into an auditory format to expand accessibility for exploring space discoveries.

While Chandra primarily observes distant, extreme cosmic objects, it also detects X-rays emitted by the Sun and reflected by solar system bodies, providing unique insights.

The sonification combines Chandra’s X-ray data with an infrared image from NASA's Hubble Space Telescope. Woodwind sounds represent X-ray emissions, including those from Jupiter's auroras and energetic particles. Additional instrument sounds indicate the planet's cloud layers, with pitch descending over features like the Great Red Spot.

This sonification integrates an optical image from NASA’s Cassini mission with Chandra X-ray data. A siren-like sound follows the arc of Saturn’s rings, while different synthesizer tones represent the planet itself. Higher synthetic tones indicate high-energy X-ray activity observed across the planet, its rings, and poles.

Data from Chandra and the W.M. Keck Observatory were used for Uranus. A cello traces the planet's ring, with notes changing to reflect detected light and its location. Higher frequencies in the sonification mark the X-rays detected by Chandra, which are reflected solar X-rays, particularly over a specific region of the planet.

NASA’s Marshall Space Flight Center manages the Chandra program. Science operations are overseen by the Smithsonian Astrophysical Observatory’s Chandra X-ray Center, with science operations in Cambridge, Massachusetts, and flight operations in Burlington, Massachusetts.