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NASA's Chandra Catches Spider Pulsars Destroying Nearby Stars
Omega Centauri
Visual Description:

  • Astronomers have made an X-ray study of “spider pulsars” in the Omega Centauri globular cluster.

  • Spider pulsar are a type of millisecond pulsar that strips their companion stars of their atmospheres through energetic winds.

  • Radio telescopes first spotted 18 millisecond pulsars in Omega Centauri and then Chandra followed up with its observations.

  • The combined data allowed researchers to better understand how spider pulsars prey on their companion stars.

A group of dead stars known as “spider pulsars” are obliterating companion stars within their reach. Data from NASA’s Chandra X-ray Observatory of the globular cluster Omega Centauri is helping astronomers understand how these spider pulsars prey on their stellar companions.

A pulsar is the spinning dense core that remains after a massive star collapses into itself to form a neutron star. Rapidly rotating neutron stars can produce beams of radiation. Like a rotating lighthouse beam, the radiation can be observed as a powerful, pulsing source of radiation, or pulsar. Some pulsars spin around dozens to hundreds of times per second, and these are known as millisecond pulsars.

Spider pulsars are a special class of millisecond pulsars, and get their name for the damage they inflict on small companion stars in orbit around them. Through winds of energetic particles streaming out from the spider pulsars, the outer layers of the pulsar’s companion stars are methodically stripped away.

Astronomers recently discovered 18 millisecond pulsars in Omega Centauri — located about 17,700 light-years from Earth — using the Parkes and MeerKAT radio telescopes. A pair of astronomers from the University of Alberta in Canada then looked at Chandra data of Omega Centauri to see if any of the millisecond pulsars give off X-rays.

They found 11 millisecond pulsars emitting X-rays, and five of those were spider pulsars concentrated near the center of Omega Centauri. The researchers next combined the data of Omega Centauri with Chandra observations of 26 spider pulsars in 12 other globular clusters.

An image of the cluster with a circle illustrated in its middle. The location of 11 pulsars are labeled with small circles and letters. Two of the pulsars are outside the large circle. The remaining pulsars are inside the large circle.
Close-up of Omega Centauri, in X-ray & optical light, showing the locations of some of the objects. Credit: X-ray: NASA/CXC/San Francisco State Univ./A. Cool et al.; Optical: NASA/ESA/STScI/AURA; Image Processing: NASA/CXC/SAO/N. Wolk

There are two varieties of spider pulsars based on the size of the star being destroyed. “Redback” spider pulsars are damaging companion stars weighing between a tenth and a half the mass of the Sun. Meanwhile, the “black widow” spider pulsars are damaging companion stars with less than 5 percent of the Sun’s mass.

The team found a clear difference between the two classes of spider pulsars, with the redbacks being brighter in X-rays than the black widows, confirming previous work. The team is the first to show a general correlation between X-ray brightness and companion mass for spider pulsars, with pulsars that produce more X-rays being paired with more massive companions. This gives clear evidence that the mass of the companion to spider pulsars influences the X-ray dose the star receives.

The X-rays detected by Chandra are mainly thought to be generated when the winds of particles flowing away from the pulsars collide with winds of matter blowing away from the companion stars and produce shock waves, similar to those produced by supersonic aircraft.

Spider pulsars are typically separated from their companions by only about one to 14 times the distance between the Earth and Moon. This close proximity — cosmically speaking — causes the energetic particles from the pulsars to be particularly damaging to their companion stars.

This finding agrees with theoretical models that scientists have developed. Because more massive stars produce a denser wind of particles, there is a stronger shock — producing brighter X-rays — when their wind collides with the particles from the pulsar. The proximity of the companion stars to their pulsars means the X-rays can cause significant damage to the stars, along with the pulsar’s wind.

Chandra's sharp X-ray vision is crucial for studying millisecond pulsars in globular clusters because they often contain large numbers of X-ray sources in a small part of the sky, making it difficult to distinguish sources from each other. Several of the millisecond pulsars in Omega Centauri have other, unrelated X-ray sources only a few arc seconds away. (One arc second is the apparent size of a penny seen at a distance of 2.5 miles.)

The paper describing these results will be published in the December issue of the Monthly Notices of the Royal Astronomical Society, and a preprint of the accepted paper is available online. The authors of the paper are Jiaqi (Jake) Zhao and Craig Heinke, both from the University of Alberta in Canada.

NASA's Marshall Space Flight Center manages the Chandra program. The Smithsonian Astrophysical Observatory's Chandra X-ray Center controls science operations from Cambridge, Massachusetts, and flight operations from Burlington, Massachusetts.

 

Visual Description:

This release features a composite image of a globular cluster, a sphere-shaped collection of stars bound together by gravity. In this conglomeration are eleven spider pulsars, which obliterate their companion stars with strong winds of particles.

In the main image of this release, scores of tiny white stars dot the blackness of space, many appearing to glow with a white or hot pink aura. Like other globular clusters, this conglomeration, named Omega Centauri, is more densely packed near the center.

A close up image of this densely-packed center reveals even more stars, blanketing the frame from corner to corner. This close up is presented fully labeled, with a white ring encircling nine of the eleven marked spider pulsars.

Each spider pulsar is the spinning core of a collapsed massive star. As they spin, the spider pulsars emit beams of radiation, like light from a lighthouse. The pulsars also produce winds of particles that methodically strip away their companion stars, layer by layer.

 

Fast Facts for Omega Centauri:
Credit  X-ray: NASA/CXC/San Francisco State Univ./A. Cool et al.; Optical: NASA/ESA/STScI; IR: NASA/JPL/Caltech; Image Processing: NASA/CXC/SAO/N. Wolk
Release Date  November 30, 2023
Scale  Image is about 16 arcmin (80 light-years) across.
Category  Normal Stars & Star Clusters
Coordinates (J2000)  RA 13h 26m 47s | Dec -47° 28´ 46"
Constellation  Centaurus
Observation Dates  4 observations from Jan 24, 2000 to Apr 16, 2012
Observation Time  80 hours 48 minutes (3 days, 8 hours 48 minutes)
Obs. ID  653, 1519, 13726, 13727
Instrument  ACIS
References Zhao, J. and Heinke, C, 2023, MNRAS, 526, 2736; arXiv:2309.13189
IR
Optical
X-ray
Distance Estimate  About 17,700 light-years
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