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Article: Multifrequency radio measurements of supernova 1987a over 22 years

TitleMultifrequency radio measurements of supernova 1987a over 22 years
Authors
KeywordsCircumstellar Matter
Ism: Supernova Remnants
Radio Continuum: General
Supernovae: General
Supernovae: Individual (Sn 1987A)
Issue Date2010
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637X
Citation
Astrophysical Journal, 2010, v. 710 n. 2, p. 1515-1529 How to Cite?
AbstractWe present extensive observations of the radio emission from the remnant of supernova (SN) 1987A made with the Australia Telescope Compact Array (ATCA), since the first detection of the remnant in 1990. The radio emission has evolved in time providing unique information on the interaction of the SN shock with the circumstellar medium. We particularly focus on the monitoring observations at 1.4, 2.4, 4.8, and 8.6 GHz, which have been made at intervals of 4-6 weeks. The flux density data show that the remnant brightness is now increasing exponentially, while the radio spectrum is flattening. The current spectral index value of -0.68 represents an 18±3% increase over the last eight years. The exponential trend in the flux is also found in the ATCA imaging observations at 9 GHz, which have been made since 1992, approximately twice a year, as well as in the 843 MHz data set from the Molonglo Observatory Synthesis Telescope from 1987 to 2007 March. Comparisons with data at different wavelengths (X-ray, Hα) are made. The rich data set that has been assembled in the last 22 years forms a basis for a better understanding of the evolution of the supernova remnant. © 2010. The American Astronomical Society. All rights reserved..
Persistent Identifierhttp://hdl.handle.net/10722/180492
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZanardo, Gen_US
dc.contributor.authorStaveley-Smith, Len_US
dc.contributor.authorBall, Len_US
dc.contributor.authorGaensler, BMen_US
dc.contributor.authorKesteven, MJen_US
dc.contributor.authorManchester, RNen_US
dc.contributor.authorNg, CYen_US
dc.contributor.authorTzioumis, AKen_US
dc.contributor.authorPotter, TMen_US
dc.date.accessioned2013-01-28T01:38:48Z-
dc.date.available2013-01-28T01:38:48Z-
dc.date.issued2010en_US
dc.identifier.citationAstrophysical Journal, 2010, v. 710 n. 2, p. 1515-1529en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/180492-
dc.description.abstractWe present extensive observations of the radio emission from the remnant of supernova (SN) 1987A made with the Australia Telescope Compact Array (ATCA), since the first detection of the remnant in 1990. The radio emission has evolved in time providing unique information on the interaction of the SN shock with the circumstellar medium. We particularly focus on the monitoring observations at 1.4, 2.4, 4.8, and 8.6 GHz, which have been made at intervals of 4-6 weeks. The flux density data show that the remnant brightness is now increasing exponentially, while the radio spectrum is flattening. The current spectral index value of -0.68 represents an 18±3% increase over the last eight years. The exponential trend in the flux is also found in the ATCA imaging observations at 9 GHz, which have been made since 1992, approximately twice a year, as well as in the 843 MHz data set from the Molonglo Observatory Synthesis Telescope from 1987 to 2007 March. Comparisons with data at different wavelengths (X-ray, Hα) are made. The rich data set that has been assembled in the last 22 years forms a basis for a better understanding of the evolution of the supernova remnant. © 2010. The American Astronomical Society. All rights reserved..en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637Xen_US
dc.relation.ispartofAstrophysical Journalen_US
dc.subjectCircumstellar Matteren_US
dc.subjectIsm: Supernova Remnantsen_US
dc.subjectRadio Continuum: Generalen_US
dc.subjectSupernovae: Generalen_US
dc.subjectSupernovae: Individual (Sn 1987A)en_US
dc.titleMultifrequency radio measurements of supernova 1987a over 22 yearsen_US
dc.typeArticleen_US
dc.identifier.emailNg, CY: stephen_ng@hku.hken_US
dc.identifier.authorityNg, CY=rp01706en_US
dc.description.naturelink_to_OA_fulltexten_US
dc.identifier.doi10.1088/0004-637X/710/2/1515en_US
dc.identifier.scopuseid_2-s2.0-76949103304en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-76949103304&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume710en_US
dc.identifier.issue2en_US
dc.identifier.spage1515en_US
dc.identifier.epage1529en_US
dc.identifier.isiWOS:000274233300046-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridZanardo, G=6602108757en_US
dc.identifier.scopusauthoridStaveley-Smith, L=7004532371en_US
dc.identifier.scopusauthoridBall, L=7102282008en_US
dc.identifier.scopusauthoridGaensler, BM=34769921200en_US
dc.identifier.scopusauthoridKesteven, MJ=7004146312en_US
dc.identifier.scopusauthoridManchester, RN=7004270810en_US
dc.identifier.scopusauthoridNg, CY=24830903500en_US
dc.identifier.scopusauthoridTzioumis, AK=7003727686en_US
dc.identifier.scopusauthoridPotter, TM=35503804700en_US
dc.customcontrol.immutablejt 130808-

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