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MSH 11-62 and G327.1-1.1: Supernova Shock Waves, Neutron Stars, and Lobsters

  • Two new Chandra images of supernova remnants reveal intricate structures left behind after massive stars exploded.

  • Powerful winds of high-energy particles are released from the dense core of the dead star to create so-called pulsar wind nebulas.

  • MSH 11-62 and G327.1-1.1 are examples of how complex the aftermath of stellar explosions can be.

A supernova that signals the death of a massive star sends titanic shock waves rumbling through interstellar space. An ultra-dense neutron star is usually left behind, which is far from dead, as it spews out a blizzard of high-energy particles. Two new images from NASA's Chandra X-ray Observatory provide fascinating views — including an enigmatic lobster-like feature — of the complex aftermath of a supernova.

When a massive star runs out of fuel resulting in a supernova explosion, the central regions usually collapse to form a neutron star. The energy generated by the formation of the neutron star triggers a supernova. As the outward-moving shock wave sweeps up interstellar gas, a reverse shock wave is driven inward, heating the stellar ejecta.

Meanwhile, the rapid rotation and intense magnetic field of the neutron star, a.k.a. a pulsar, combine to generate a powerful wind of high-energy particles. This so-called pulsar wind nebula can glow brightly in X-rays and radio waves.

A long observation with Chandra of the supernova remnant MSH 11-62 (left image) reveals an irregular shell of hot gas, shown in red, surrounding an extended nebula of high energy X-rays, shown in blue. Even though scientists have yet to detect any pulsations from the central object within MSH 11-62, the structure around it has many of the same characteristics as other pulsar wind nebulas. The reverse shock and other, secondary shocks within MSH 11-62 appear to have begun to crush the pulsar wind nebula, possibly contributing to its elongated shape. (Note: the orientation of this image has been rotated by 24 degrees so that north is pointed to the upper left.)

MSH 11-62 is located about 16,000 light years from Earth. The foreground of MSH 11-62 is speckled with hundreds of sources associated with the open stellar cluster Trumpler 18, located at a distance of about 5,000 light years, revealing a vast collection of stars.

The supernova remnant G327.1-1.1, located about 29,000 light years from Earth, is another spectacular debris field left behind when a massive star exploded. The Chandra image of G327.1-1.1 (right image) shows the outward-moving, or forward, shock wave (seen as the faint red color), and a bright pulsar wind nebula (blue). The pulsar wind nebula appears to have been distorted by the combined action of the reverse shock wave, which may have flattened it, and by the motion of the pulsar, which created a comet, or lobster-like tail. An asymmetric supernova explosion may have given a recoil kick to the pulsar, causing it to move rapidly and drag the pulsar wind nebula along with it.

Two structures resembling lobster claws protrude from near the head of the pulsar wind nebula. The origin of these features, which may be produced by the interaction of the pulsar wind with the reverse shock, is unknown.

These results are presented at the "15 Years of Chandra" symposium ( by Patrick Slane of the Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass., and Tea Temim of NASA's Goddard Space Flight Center, Greenbelt, Md.

NASA's Marshall Space Flight Center in Huntsville, Alabama, manages the Chandra program for NASA's Science Mission Directorate in Washington. The Smithsonian Astrophysical Observatory in Cambridge, Massachusetts, controls Chandra's science and flight operations.

Fast Facts for G327.1-1.1:
Credit  NASA/CXC/GSFC/T.Temim et al.
Release Date  November 19, 2014
Scale  Image is 17.5 arcmin across (150 light years).
Category  Supernovas & Supernova Remnants, Neutron Stars/X-ray Binaries
Coordinates (J2000)  RA 15h 54m 25.0s | Dec -55° 04´ 06.0"
Constellation  Norma
Observation Dates  1 pointing in July, 2001; 3 in May, 2012
Observation Time  107 hours 28 min (4 days 11 hours 28 min)
Obs. IDs  1955, 13767, 13768, 14430
Instrument  ACIS
Color Code  X-ray (Red, Green, Blue)
Distance Estimate  About 29000 light years
distance arrow
Fast Facts for MSH 11-62:
Credit  NASA/CXC/SAO/P.Slane et al
Release Date  November 19, 2014
Scale  Image is 55 arcmin across (256 light years).
Category  Supernovas & Supernova Remnants
Coordinates (J2000)  RA 11h 11m 52.00s | Dec -60° 39´ 12.00"
Constellation  Carina
Observation Dates  1 pointing in Apr 2002; 8 between Oct 2013-Jan 2014
Observation Time  131 hours 17 min (5 days 11 hours 17 min)
Obs. IDs  2782, 14822-14824, 16496, 16497, 16512, 16541, 16566
Instrument  ACIS
Color Code  X-ray (Red, Green, Blue)
Distance Estimate  About 16,000 light years
distance arrow
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