Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...18912013m&link_type=abstract
American Astronomical Society, 189th AAS Meeting, late abstracts, #120.13; Bulletin of the American Astronomical, Vol. 29, p. 73
Astronomy and Astrophysics
Astronomy
Scientific paper
In order to determine the nature of an object identified as a potential supernova remnant (SNR) in a 327 MHz survey of the Galactic plane, continuum data have been taken at 1420 MHz with identical resolution to that of the survey. Additionally, HI spectral line data have been taken in order to determine the distance to the object. Multifrequency analysis shows that a shell feature in the southern part of this object is nonthermal and confirms earlier studies that identified the northern portion as an HII region. The nonthermal nature of the shell and the absence of infrared flux density confirms the speculation of Taylor et al. (1992) that this object, G55.0+0.3, is an SNR. From analysis of atomic hydrogen, its estimated distance is 14 kpc, yielding a radius of 62 pc. This makes it one of the largest known of this class of objects. Additionally, an age estimate of one million years exceeds the conventional limits in the literature by a factor of five. There also exists compelling evidence that the remnant could in fact be associated with the nearby pulsar, J1932+2020. The discovery of G55.0+0.3 implies that the radiative lifetimes of SNR could be much longer than previously suggested. The proposed pulsar/SNR association is older than any previously documented by an order of magnitude. If valid, it suggests that searches for associations should not be restricted to the regions about young pulsars.
Matthews Brenda C.
Taylor Russ A.
Wallace B. J.
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