A new galactic supernova remnant, G312.4–0.4
Open Access
- 1 October 1985
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 216 (3) , 753-760
- https://doi.org/10.1093/mnras/216.3.753
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 us 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: (i) a previously known SNR, G311.5–0.3; (ii) four sources that are non-thermal and most likely extragalactic; (iii) 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.Keywords
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