The Geminga supernova as a possible cause of the local interstellar bubble
Article Abstract:
The explosion of the supernova that produced the Geminga pulsar may have created the cavity of hot low-density X-ray emitting gas known as the Local Bubble. The location and age of Geminga and the proper motion of its optical counterpart provide evidence the the supernova was within 60 parsecs of the Solar System, a location where its explosion might have produced the void. The age of Geminga has been determined to be 300,000 years with a pulsar distance between 150 and 400 parsecs. The proper motion of its optical counterpart has been measured at 0.17" per year.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Detection of Geminga as a radio pulsar
Article Abstract:
The Large Phased Array, a sensitive transit antenna consisting of 16,384 dipoles, has been used to detect pulsed 102.5 MHz radio emission from Geminga, a strong gamma-ray source in the constellation Gemini. The small dispersion measure confirms that Geminga is close to the Sun, and identifies that it is the weakest known radio pulsar. It was possible to use known calibration sources to estimate the flux density of Geminga for each of the 37 days on which observations were obtained.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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Detection of high-velocity 26Al towards the Galactic Centre
Article Abstract:
The release of radioactive 26Al into the interstellar medium by supernova explosions from giant stars and stars in Wolf-Rayet phase gives a high velocity 1809-keV emission line from the direction of the Galactic Centre. The line width of the 1809-keV emission line is triple of that expected from Doppler broadening due to Galactic rotation. The presence of the spectral line acts as a tracer of Galactic nucleosynthesis during the past million years.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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