قالب وردپرس درنا توس
Home / Science / "Lone" Neutron Star 200,000 light-years from Earth is the first of its kind discovered outside the Milky Way

"Lone" Neutron Star 200,000 light-years from Earth is the first of its kind discovered outside the Milky Way



About 2000 years ago, a supernova named 1E 0102.2-7219 (E0102 for short) exploded in the Small Magellanic Cloud, a dwarf galaxy near the Milky Way. In the aftermath, a rare kind of neutron star was born, which has never been found outside the boundaries of our galaxy.

What makes this neutron star so unusual is that unlike many other neutron stars (ultra-dense and massive stars from the collapsed nuclei of supernovae), it has a very low magnetic field and lacks a white dwarf companion, NASA reports.

This cosmic curiosity could help as a "lone" neutron star to shed more light in how supernovae form heavy elements such as oxygen and carbon, notes the space agency.

Because the E01

02 residue exists independently of a binary star system and does not emit pulsed X-rays like most fast-rotating and high-magnetic X-ray pulsars fall into a special category of neutron stars, of which only a handful were discovered within the Milky Way.

These include the oxygen-rich neutron stars located at the center of the Cassiopeia. One supe of the Removan residue, about 11,000 light-years from our planet, and the supernova remnant Puppis A, about 7,000 light-years from Earth.

But this particular neutron star is much further away from our planet than the similar neutron stars from the explosions of the supernovae Cassiopeia A and Puppis A.

Discovered more than 30 years ago The E0102 Remnant is located 200,000 light-years from Earth and is actually the first neutron star of its kind ever found outside our own galaxy.

Recent Research with NASA's Chandra X-Ray Telescope and the Very Large of the European Southern Observatory The telescope (VLT) in Chile revealed that the neutron star, two millennia ago, is wrapped in two separate ring-shaped structures of leftover E0102 explosive material ,

The photo below shows a composite of X-ray and optical observations. When two telescopes are used, the neutron star is displayed as a blue dot emitting X-rays.

The star is surrounded by a large blue ring of X-rays generated by the explosion wave of the supernova explosion (X-ray view of Chandra). Within the outer ring is another annular structure, a smaller circle of gas shown in light red (optical view of the VLT).

  Neutron star in supernova remnant E0102
A composite image of the E0102 remnant consisting of X-ray observations of Chandra (blue and violet), visible light data from VLT's MUSE instrument (light red) and additional data from Hubble (dark red and green).

NASA


As NASA explains, the green filamentous structure that floats in the outer ring is debris from the Supernova E0102, which emanates from the original star after a massive explosion and speeds in excess of several million kilometers per hour to be thrown into outer space.

One such material, captured in the above image by the Hubble Space Telescope, was included in the E0102 remnant as the neutron star formed, yielding the most recent observations.

In addition, data from the Multi Unit Spectroscopic Explorer of the VLT (MUSE) showed that the X-ray spectrum of the neutron star (or its X-ray energy signature) is very similar to that of Cassiopeia A and Puppis A remnants, which is a good case represents that the E0102 residue is also rich in oxygen.

This finding is important to understand how heavy elements are created from supernova explosions because these massive stars are out of fuel and collapse into neutron stars.

"Oxygen-rich supernova remnants such as E0102 are important to understanding how massive stars merge lighter elements into heavier ones before they explode."

The agency also plans to monitor the radio of the neutron star to another of the "lonely" "The riddles of the star, namely why it lies outside the blue circle of the X-ray emission.

One theory states that the supernova E0102 exploded near the center of its remnant and ejected the neutron star from the blast at incredible speeds of about 2 million mph.

Another explanation states the supernova blast site somewhere near the neutron star's current position, which would mean that the star is moving very slowly and that the gas ring pictured in the optical red circle could actually originate the E0102 residue as well as the supernova itself.

D The results of the research are published in Nature Astronomy


Source link