Orion–Eridanus Superbubble Explained

The Orion–Eridanus Superbubble or Eridanus Soft X-ray Enhancement is a superbubble located west of the Orion Nebula. The region is formed from overlapping supernova remnants that may be associated with the Orion OB1 stellar association; the bubble is approximately 1200 ly across.^[1] It is the nearest superbubble to the Local Bubble containing the Sun, with the respective shock fronts being about 500 ly apart.^[1]

The structure was discovered from 21 cm radio observations by Carl Heiles and interstellar optical emission line observations by Reynolds and Ogden in the 1970s.^[2]

See also

• Barnard's Loop

Notes and References

1. Book: Aschenbach, B. . Hermann-Michael Hahn . Joachim Truemper . The invisible sky: ROSAT and the age of X-ray astronomy. 1998. Springer. 978-0-387-94928-4.
2. Web site: Sanders. Robert. Bursting bubbles in the galactic disk appear to be source of hot gas permeating the Milky Way galaxy and its halo. University of California Berkeley.