Chandra X-ray Observatory Releases New Catalog, Sonifications, and Planetary Data

Chandra Unveils New Cosmic Treasures: From a Young Star's 'Bubble' to Patriotic Nebulae

NASA's Chandra X-ray Observatory has released a series of new astronomical data products, including an updated source catalog, multiple sonifications of space objects, and the first X-ray image of an astrosphere surrounding a young Sun-like star.

Updated Source Catalog

The Chandra X-ray Observatory has released the Chandra Source Catalog (CSC) version 2.1, which includes all X-ray data detected by the observatory up to the end of 2020. The catalog contains over 400,000 unique compact and extended sources and more than 1.3 million individual detections in X-ray light.

The catalog provides precise sky positions and X-ray energy information from Chandra observations. This data allows scientists to combine X-ray information with observations from other telescopes, including NASA's James Webb Space Telescope and Hubble Space Telescope.

A new image of the Galactic Center, the region surrounding the supermassive black hole Sagittarius A* in the Milky Way, demonstrates the catalog's scope. The image spans approximately 60 light-years and shows over 3,300 individual X-ray sources detected by Chandra. It is a composite of 86 observations, representing over three million seconds of observing time.

"The catalog provides precise sky positions and X-ray energy information from Chandra observations."

The Chandra Source Catalog is accessible online at https://cxc.cfa.harvard.edu/csc/. NASA's Marshall Space Flight Center manages the Chandra program, while the Smithsonian Astrophysical Observatory's Chandra X-ray Center oversees science operations from Cambridge, Massachusetts, and flight operations from Burlington, Massachusetts.

US 250th Birthday Cosmic Images and Sonifications

As part of celebrations for the 250th anniversary of the United States, NASA released four cosmic images from the Chandra X-ray Observatory rendered in red, white, and blue, along with three sonifications.

Cassiopeia A: The top panel combines X-ray data from Chandra (blue and purple) with infrared data from the James Webb Space Telescope (red and white). Chandra reveals the blast wave and elements in the debris field, including iron, calcium, and oxygen. Webb shows the expanding shell and cosmic dust.

NGC 3603: Located in the Milky Way, this nebula contains a massive star cluster. Chandra data (red and white) shows diffuse emissions and point-like X-ray sources. Hubble data (red-orange, green, blue, yellow) reveals stars, dust, and gas. Combined colors make the nebula appear primarily red, white, and blue.

NGC 4736 (Messier 94): A spiral galaxy with a starburst ring. Chandra X-rays (red, orange, blue) are layered with ground-based visible light (red, green, blue). New stars are forming, possibly fueled by gas in the oval-shaped structure.

ZwCl 0024+1652: A distant galaxy cluster with evidence for dark matter. Hubble data (blue) shows dark matter distribution; another Hubble image shows galaxies (yellow and white). Chandra data (red) reveals superheated gas, which has more mass than all the galaxies combined.

The sonifications translate astronomical data into sound:

• NGC 3603: Brightness controls volume. Chandra compact sources are heard as piano notes; diffuse X-rays are mapped to audio frequencies. Hubble optical data is represented as sustained tones and acoustic guitar harmonics.

• NGC 4736: Uses a clockwise scan. Chandra X-rays are heard as wind-like sounds; compact sources as glass marimba pitches. Ground-based optical data is a low drone; stars and galaxies are soft piano.

• ZwCl 0024+1652: Uses a circular scan inward. Volume is linked to brightness, peaking at dark matter and core. Background stars are glockenspiel; galaxies are piano; Chandra X-rays are airy synthesizer notes.

"The sonifications translate astronomical data into sound, making space discoveries accessible through hearing."

The sonifications were led by the Chandra X-ray Center as part of NASA's Universe of Learning program. The team includes Kimberly Arcand (CXC), Matt Russo (astrophysicist), Andrew Santaguida (musician), SYSTEM Sounds, and consultant Christine Malec.

Astrosphere Around Young Sun-like Star HD 61005

Astronomers using the Chandra X-ray Observatory have captured the first image of an astrosphere surrounding a young, Sun-like star named HD 61005. The findings have been accepted for publication by The Astrophysical Journal.

An astrosphere is a bubble created by winds from a star's surface, filled with hot gas, that expands into cooler galactic gas and dust. The Sun has a similar structure called the heliosphere, which extends beyond the planets and shields Earth from cosmic radiation. The image of HD 61005's astrosphere shows extended X-ray emission rather than a single point of light.

HD 61005 is located approximately 120 light-years from Earth. It shares similar mass and temperature characteristics with the Sun but is estimated to be about 100 million years old, compared to the Sun's approximately 5 billion years. Due to its youth, HD 61005 possesses a more powerful stellar wind, moving about three times faster and being approximately 25 times denser than the Sun's current wind.

The interstellar medium around HD 61005 is about a thousand times denser than that around the Sun.

Chandra detected the astrosphere because the stellar wind from HD 61005 collides with the dense, cooler local interstellar dust and gas, producing X-rays. The combination of the dense galactic environment, the strong stellar wind, the star's proximity, and Chandra's high-resolution X-ray vision facilitated the discovery. The astrosphere has a diameter approximately 200 times the distance from Earth to the Sun.

An artist's illustration depicts a bow shock—a curved shock wave similar to a sonic boom—that forms as the star and its astrosphere move through interstellar gas.

Carey Lisse of Johns Hopkins University, who led the study, stated that this observation provides an external view of an astrosphere, offering insights into the Sun's heliosphere and its evolution over billions of years. Scott Wolk of the Center for Astrophysics | Harvard & Smithsonian noted that the image offers information about the Sun's early wind characteristics, which can impact satellites and astronauts traveling in space.

Astronomers have nicknamed HD 61005 the "Moth" due to the large amounts of dust surrounding it, which forms patterns resembling moth wings when viewed with infrared telescopes. This dust is residual material from the star's formation, similar to the Kuiper Belt in the solar system.

Planetary Sonifications

The Chandra X-ray Observatory released sonifications on February 25, translating astronomical data from three planets—Jupiter, Saturn, and Uranus—into sound.

Sonifications convert astronomical data into a format that can be experienced through hearing. This method aims to expand accessibility for exploring space discoveries made by telescopes.

While primarily known for observing black holes and other extreme objects, Chandra also detects X-rays emitted by the Sun that are reflected by planets, moons, and other celestial bodies.

Jupiter: The sonification combines X-ray data from Chandra with an infrared image from the Hubble Space Telescope. Woodwind sounds represent Chandra's X-ray data, including emissions from Jupiter's auroras and energetic particles surrounding the planet. Additional instruments contribute sounds for the planet's complex cloud layers, with the pitch descending as the scan passes over features including the Great Red Spot.

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

Uranus: For the ice giant Uranus, data from Chandra and the W.M. Keck Observatory were used. A cello traces the planet's ring, and notes change to reflect the amount of detected light and its location on Uranus. Higher frequencies mark the X-rays detected by Chandra, which are reflected solar X-rays.