G55.0+0.3: A Highly Evolved Supernova Remnant | Zendy

Brenda C. Matthews | Zendy; B. J. Wallace | Zendy; A. R. Taylor | Zendy

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G55.0+0.3: A Highly Evolved Supernova Remnant

Author(s) -

Brenda C. Matthews,

B. J. Wallace,

A. R. Taylor

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/305112

Subject(s) - supernova remnant , physics , galactic plane , supernova , astrophysics , hydrogen line , line (geometry) , resolution (logic) , astronomy , object (grammar) , order (exchange) , galaxy , computer science , geometry , artificial intelligence , mathematics , finance , economics

Multi-frequency analysis has revealed the presence of a new supernovaremnant, G55.0+0.3, in the Galactic plane. A kinematic distance of 14 kpc hasbeen measured from HI spectral line data. The faint, clumpy half-shell isnon-thermal and has a physical radius of 70 pc. Using an evolutionary model,the age of the remnant is estimated to be on the order of one million years,which exceeds conventional limits by a factor of five. The remnant may beassociated with the nearby pulsar J1932+2020, which has a spin-down age of 1.1million years. This work implies that the radiative lifetimes of remnants couldbe much longer than previously suggested.Comment: 27 pages, 7 figures in 9 files (figures 1 and 2 require 2 files each), Accepted for publication in The Astrophysical Journal (Jan. 20, 1998 volume

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