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Atacama Compact Arr...
Atacama Compact Array observations of the pulsar-wind nebula of SNR 0540-69.3
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- Lundqvist, Peter (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Lundqvist, N. (author)
- Stockholms universitet,Institutionen för astronomi
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Vlahakis, C. (author)
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- Björnsson, Claes-Ingvar (author)
- Stockholms universitet,Institutionen för astronomi
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Dickel, J. R. (author)
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Matsuura, M. (author)
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Shibanov, Yu A. (author)
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Zyuzin, D. A. (author)
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- Olofsson, Göran (author)
- Stockholms universitet,Institutionen för astronomi
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(creator_code:org_t)
- 2020-06-13
- 2020
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 496:2, s. 1834-1844
- Related links:
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https://orca.cardiff...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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 F-nu proportional to nu(-alpha nu) with the spectral index alpha(nu) = 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 To conclude how this joins the synchrotron spectrum at higher frequencies, we include hitherto unpublished AKARI mid-infrared data, and evaluate published data in the ultraviolet (UV), optical, and infrared (IR).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 alpha(nu) = 0.87(-0.10)(+0.08). There is room for 2.5 x 10(-3) M-circle dot of dust with a temperature of similar to 55 K if there are dual breaks in the synchrotron spectrum, one around similar to 9 x 10(10) Hz and another at similar to 2 x 10(13) Hz. The spectral index then changes at similar to 9 x 10(10) Hz from alpha(nu) = 0.14 +/- 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 resolve the PWN. In particular, the strong emission similar to 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 similar to 20-35 arcsec west of the pulsar, and for the shell we derive alpha(nu )= 0.64 +/- 0.05 for the range 8.6-145 GHz.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- pulsars: individual: PSR B0540-69.3
- supernovae: general
- ISM: SNR 0540-69.3
- ISM: supernova remnants
- Magellanic Clouds
Publication and Content Type
- ref (subject category)
- art (subject category)
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