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Title:
A new galactic supernova remnant, G312.4-0.4
Authors:
Caswell, J. L.; Barnes, P. J.
Affiliation:
AA(CSIRO, Div. of Radiophysics, Epping, Australia), AB(Sydney, University, Australia)
Publication:
Royal Astronomical Society, Monthly Notices (ISSN 0035-8711), vol. 216, Oct. 1, 1985, p. 753-760. (MNRAS Homepage)
Publication Date:
10/1985
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL MAPS, GALACTIC STRUCTURE, RADIO SOURCES (ASTRONOMY), SUPERNOVA REMNANTS, BRIGHTNESS, FORMALDEHYDE, H II REGIONS
Bibliographic Code:
1985MNRAS.216..753C

Abstract

A new continuum map at 408 MHz is presented for a portion of the galactic plane near longitude 312°. Comparison with 5000-MHz measurements of similar angular resolution (several arcminutes), in both the radio continuum and hydrogen recombination lines, has allowed the authors to distinguish a hitherto unnoticed supernova remnant (SNR), G312.4-0.4, with angular diameter ≡0°.5 and distance ≡5 kpc. Other discrete sources on the map include: (1) a previously known SNR, G311.5-0.3; (2) four sources that are non-thermal and most likely extragalactic; (3) 16 H II regions, of which two are located in an extremely distant portion of the Carina spiral arm, ≡16 kpc from the Sun, with galactocentric radius ≡12.3 kpc.

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