Search: onr:"swepub:oai:DiVA.org:su-160568" >
SPECTRAL AND MORPHO...
SPECTRAL AND MORPHOLOGICAL ANALYSIS OF THE REMNANT OF SUPERNOVA 1987A WITH ALMA AND ATCA
-
Zanardo, Giovanna (author)
-
Staveley-Smith, Lister (author)
-
Indebetouw, Remy (author)
-
show more...
-
Chevalier, Roger A. (author)
-
Matsuura, Mikako (author)
-
Gaensler, Bryan M. (author)
-
Barlow, Michael J. (author)
-
- Fransson, Claes (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
Manchester, Richard N. (author)
-
Baes, Maarten (author)
-
Kamenetzky, Julia R. (author)
-
Lakićević, Maša (author)
-
- Lundqvist, Peter (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
Marcaide, Jon M. (author)
-
Martí-Vidal, Ivan (author)
-
Meixner, Margaret (author)
-
Ng, C. -Y. (author)
-
Park, Sangwook (author)
-
Sonneborn, George (author)
-
Spyromilio, Jason (author)
-
van Loon, Jacco Th. (author)
-
show less...
-
(creator_code:org_t)
- 2014
- 2014
- English.
-
In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 796:2
- Related links:
-
https://urn.kb.se/re...
-
show more...
-
https://doi.org/10.1...
-
show less...
Abstract
Subject headings
Close
- 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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- ISM: supernova remnants
- radiation mechanisms: non-thermal
- radiation mechanisms: thermal
- radio continuum: general
- stars: neutron
- supernovae: individual (SN 1987A)
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
-
Zanardo, Giovann ...
-
Staveley-Smith, ...
-
Indebetouw, Remy
-
Chevalier, Roger ...
-
Matsuura, Mikako
-
Gaensler, Bryan ...
-
show more...
-
Barlow, Michael ...
-
Fransson, Claes
-
Manchester, Rich ...
-
Baes, Maarten
-
Kamenetzky, Juli ...
-
Lakićević, Maša
-
Lundqvist, Peter
-
Marcaide, Jon M.
-
Martí-Vidal, Iva ...
-
Meixner, Margare ...
-
Ng, C. -Y.
-
Park, Sangwook
-
Sonneborn, Georg ...
-
Spyromilio, Jaso ...
-
van Loon, Jacco ...
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
- Articles in the publication
-
Astrophysical Jo ...
- By the university
-
Stockholm University