Further Observations of the Filamentary Nebulosity Around the Cetus Arc (Loop 2)

Details Further Observations of the Filamentary Nebulosity Around the Cetus Arc (Loop 2) Further Observations of the Filamentary Nebulosity Around the Cetus Arc (Loop 2)

May 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970ap%26ss...7..252e&link_type=abstract

Astrophysics and Space Science, Volume 7, Issue 2, pp.252-260

Astronomy and Astrophysics

Astrophysics

19

Scientific paper

Previously some filamentary nebulosity was discovered around the outer edge of the Cetus Arc (Loop 2). Some further observations have now been made of this. To determine an upper limit to its proper motion it was photographed again with the Mount Palomar 48-inch Schmidt telescope. Also, to reveal the full extent of this nebulous region, more photographs have been added to the original mosaic and it has been photographed again with a wider field filter camera. No proper motion greater than 0{./″}5/year was detected. However, some further ridges of nebulosity were discovered. A shell model for Loop 2 based on this upper limit to the proper motion of the nebulosity and its similarity to the Cygnus Loop is presented. Some comments on the excitation mechanism of the nebulosity are also made.

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