G64.5+0.9, a new shell supernova remnant with unusual central emission

Abstract

We present observations between 1.4 and 18 GHz confirming that G64.5+0.9 is new Galactic shell supernova remnant, using the Very Large Array and the Arcminute Microkelvin Imager. The remnant is a shell ~8 arcmin in diameter with a spectral index of alpha = 0.47 +/- 0.03 (with alpha defined such that flux density S varies with frequency nu as S proportional to nu to the power of -alpha). There is also emission near the centre of the shell, ~1 arcmin in extent, with a spectral index of alpha = 0.81 +/- 0.02. We do not find any evidence for spectral breaks for either source within our frequency range. The nature of the central object is unclear and requires further investigation, but we argue that is most unlikely to be extragalactic. It is difficult to avoid the conclusion that it is associated with the shell, although its spectrum is very unlike that of known pulsar wind nebulae.

5 pages, 6 figures, submitted to MNRAS

References in corpus (7)

• The ATNF Pulsar Catalogue
• The XMM-Newton Serendipitous Survey. V. The Second XMM-Newton Serendipitous Source Catalogue
• Discovery of 35 New Supernova Remnants in the Inner Galaxy
• The XMM-Newton Serendipitous Survey V. Optical identification of the XMM-Newton Medium sensitivity Survey (XMS)
• DA495 - an aging pulsar wind nebula
• Multifrequency VLA observations of the FR I radio galaxy 3C 31: morphology, spectrum and magnetic field
• Comments on the radio spectrum of HB 3

Cited by in corpus (6)

• A revised Galactic supernova remnant catalogue
• AMI-LA radio continuum observations of Spitzer c2d small clouds and cores: Perseus region
• Sunyaev-Zel'dovich observations of galaxy clusters out to the virial radius with the Arcminute Microkelvin Imager
• AMI Large Array radio continuum observations of Spitzer c2d small clouds and cores
• The Galactic distribution of SNRs
• AMI-LA radio continuum observations of Spitzer c2d small clouds and cores: Serpens region