Atacama Compact Array Observations of the Pulsar-Wind Nebula of SNR 0540-69.3

Abstract

We present observations of the pulsar-wind nebula (PWN) region ofSNR 0540-69.3. The observations were made with the Atacama Compact Array (ACA) in Bands 4 and 6. We also add radio observations from the Australia Compact Array (ATCA) at 3 cm. For 1.449 - 233.50 GHz we obtain a synchrotron spectrum $F_{\nu }\propto {\nu }^{-{\alpha }_{\nu }}$, with the spectral index ${\alpha }_{\nu }=0.17\pm 0.02$. To conclude how this joins the synchrotron spectrum at higher frequencies we include hitherto unpublished AKARI mid-infrared data, and evaluate published data in the ultraviolet (UV), optical and infrared (IR). In particular, some broad-band filter data in the optical must be discarded from our analysis due to contamination by spectral line emission. For the UV/IR part of the synchrotron spectrum, we arrive at ${\alpha }_{\nu }=0.87_{-0.10}^{+0.08}$. There is room for $2.5\times 10^{-3}$ solar masses of dust with temperature $\sim 55$ K if there are dual breaks in the synchrotron spectrum, one around $\sim 9\times 10^{10}$ Hz, and another at $\sim 2\times 10^{13}$ Hz. The spectral index then changes at $\sim 9\times 10^{10}$ Hz from ${\alpha }_{\nu }=0.14\pm 0.07$ in the radio, to ${\alpha }_{\nu }=0.35_{+0.05}^{-0.07}$ in the millimetre to far-IR range. The ACA Band 6 data marginally resolves the PWN. In particular, the strong emission 1.5" south-west of the pulsar, seen at other wavelengths, and resolved in the 3-cm data with its 0.8" spatial resolution, is also strong in the millimeter range. The ACA data clearly reveal the supernova remnant shell 20-35 arcsec west of the pulsar, and for the shell we derive ${\alpha }_{\nu }=0.64\pm 0.05$ for the range $8.6-145$~GHz.

MNRAS, accepted

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Cited by in corpus (8)

• Clumps and rings of ejecta in SNR 0540-69.3 as seen in 3D
• Kinematics, structure and abundances of supernova remnant 0540-69.3
• Spitzer and Herschel studies of dust in supernova remnants in the Small Magellanic Cloud
• Pulsar Wind Nebulae
• Spatial Variations and Breaks in the Optical-NIR spectra of the Pulsar and PWN in SNR 0540-69.3
• Near-infrared evolution of the equatorial ring of SN 1987A
• Intermediate-luminosity red transients: Spectrophotometric properties and connection to electron-capture supernova explosions
• A Spectroscopic Study of Supernova Remnants with the Infrared Space Observatory