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]

Soft X-ray image of the Orion-Eridanus Superbubble with ROSAT.

The Orion-Eridanus superbubble in Hydrogen-alpha, with the Barnard's Loop and Eridanus Loop. Image covers the same area of the sky as the left image.

Part of the Orion-Eridanus Superbubble with ROSAT. The contours are 100 Mircon IRAS observations and show the shielding of soft x-rays by a filament.

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

References

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