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SPECTRAL AND MORPHOLOGICAL ANALYSIS OF THE REMNANT OF SUPERNOVA 1987A WITH ALMA AND ATCA
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Number of Authors: 212014 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 796, no 2, article id 82Article in journal (Refereed) Published
Abstract [en]

We present a comprehensive spectral and morphological analysis of the remnant of supernova (SN) 1987A with the Australia Telescope Compact Array (ATCA) and the Atacama Large Millimeter/submillimeter Array (ALMA). The non-thermal and thermal components of the radio emission are investigated in images from 94 to 672 GHz (lambda 3.2 mm to 450 mu m), with the assistance of a high-resolution 44 GHz synchrotron template from the ATCA, and a dust template from ALMA observations at 672 GHz. An analysis of the emission distribution over the equatorial ring in images from 44 to 345 GHz highlights a gradual decrease of the east-to-west asymmetry ratio with frequency. We attribute this to the shorter synchrotron lifetime at high frequencies. Across the transition from radio to far infrared, both the synchrotron/dust-subtracted images and the spectral energy distribution (SED) suggest additional emission beside the main synchrotron component (S-nu proportional to nu(-0.73)) and the thermal component originating from dust grains at T similar to 22 K. This excess could be due to free-free flux or emission from grains of colder dust. However, a second flat-spectrum synchrotron component appears to better fit the SED, implying that the emission could be attributed to a pulsar wind nebula (PWN). The residual emission is mainly localized west of the SN site, as the spectral analysis yields -0.4 less than or similar to alpha less than or similar to -0.1 across the western regions, with alpha similar to 0 around the central region. If there is a PWN in the remnant interior, these data suggest that the pulsar may be offset westward from the SN position.

Place, publisher, year, edition, pages
2014. Vol. 796, no 2, article id 82
Keywords [en]
ISM: supernova remnants, radiation mechanisms: non-thermal, radiation mechanisms: thermal, radio continuum: general, stars: neutron, supernovae: individual (SN 1987A)
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-160568DOI: 10.1088/0004-637X/796/2/82ISI: 000344878900011OAI: oai:DiVA.org:su-160568DiVA, id: diva2:1254590
Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2018-10-09Bibliographically approved

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Staveley-Smith, ListerGaensler, Bryan M.Barlow, Michael J.Fransson, ClaesBaes, MaartenLakićević, MašaLundqvist, PeterMartí-Vidal, IvanNg, C. -Y.van Loon, Jacco Th.
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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