Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Atacama compact array observations of the pulsar-wind nebula of SNR 0540-69.3

Lundqvist, P., Lundqvist, N., Vlahakis, C., Björnsson, C.-I., Dickel, J. R., Matsuura, M., Shibanov, Yu. A., Zyuzin, D. A. and Olofsson, G. 2020. Atacama compact array observations of the pulsar-wind nebula of SNR 0540-69.3. Monthly Notices of the Royal Astronomical Society 496 (2) , pp. 1834-1844. 10.1093/mnras/staa1675

[img]
Preview
PDF - Published Version
Download (2MB) | Preview

Abstract

We present observations of the pulsar-wind nebula (PWN) region of SNR 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 at 3 cm. For 1.449–233.50 GHz, we obtain a synchrotron spectrum Fν∝ν−αν⁠, with the spectral index αν = 0.17 ± 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 To conclude how this joins the synchrotron spectrum at higher frequencies, we include hitherto unpublished AKARI mid-infrared data, and evaluate published data in the ultraviolet (UV), optical, and infrared (IR).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 αν=0.87+0.08−0.10⁠. There is room for 2.5 × 10−3 M⊙ of dust with a temperature of ∼55 K if there are dual breaks in the synchrotron spectrum, one around ∼9 × 1010 Hz and another at ∼2 × 1013 Hz. The spectral index then changes at ∼9 × 1010 Hz from αν = 0.14 ± 0.07 in the radio to αν=0.35−0.07+0.05 in the millimetre-to-far-IR range. The ACA Band 6 data marginally resolve 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 millimetre range. The ACA data clearly reveal the supernova remnant shell ∼20–35 arcsec west of the pulsar, and for the shell we derive αν = 0.64 ± 0.05 for the range 8.6–145 GHz.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 11 June 2020
Date of Acceptance: 6 June 2020
Last Modified: 14 Jul 2020 10:14
URI: http://orca.cf.ac.uk/id/eprint/132349

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics