Multi-frequency Radio Measurements of SN 1987A over 22 Years

Abstract

We present extensive observations of the radio emission from the remnant of 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 supernova 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 8 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 March 2007. 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.

37 pages, 11 figures, accepted by ApJ

References in corpus (12)

• The Triple-Ring Nebula around SN1987A: Fingerprint of a binary merger
• Long Term Radio Monitoring of SN 1993J
• Supernova 1996cr: SN 1987A's Wild Cousin?
• Infrared and X-Ray Evidence for Circumstellar Grain Destruction by the Blast Wave of Supernova 1987A
• Fourier Modeling of the Radio Torus Surrounding Supernova 1987A
• XMM-Newton observations of SN1987A
• Evolution of the Reverse Shock Emission from SNR 1987A
• 8.4GHz VLBI observations of SN2004et in NGC6946
• High resolution 36 GHz imaging of the Supernova Remnant of SN1987A
• Magnetic field in supernova remnant SN 1987A
• Fifteen Years of High-Resolution Radio Imaging of Supernova 1987A
• Chandra Observations of Supernova 1987A

Cited by in corpus (49)

• Herschel Detects a Massive Dust Reservoir in Supernova 1987A
• Dust Production and Particle Acceleration in Supernova 1987A Revealed with ALMA
• A stubbornly large mass of cold dust in the ejecta of Supernova 1987A
• Radio emission from Supernova Remnants
• The timing and location of dust formation in the remnant of SN 1987A
• Thermal and non-thermal emission from circumstellar interaction
• Statistical Analysis of Supernova Remnants in the Large Magellanic Cloud
• High angular resolution ALMA images of dust and molecules in the SN 1987A ejecta
• Universal behaviour of shock precursors in the presence of efficient cosmic-ray acceleration
• The fully developed remnant of a neutrino-driven supernova: Evolution of ejecta structure and asymmetries in SNR Cassiopeia A
• X-ray illumination of the ejecta of Supernova 1987A
• The 3-D Structure of SN 1987A's inner Ejecta
• The Radio Luminosity-Risetime Function of Core-Collapse Supernovae
• Five Years of Mid-Infrared Evolution of the Remnant of SN 1987A: The Encounter Between the Blast Wave and the Dusty Equatorial Ring
• Radio Observations Reveal Unusual Circumstellar Environments for Some Type Ibc Supernova Progenitors
• The influence of supernova remnants on the interstellar medium in the Large Magellanic Cloud seen at 20--600 $\mu$m wavelengths
• Spectral and morphological analysis of the remnant of Supernova 1987A with ALMA & ATCA
• 3D MHD modeling of the expanding remnant of SN 1987A. Role of magnetic field and non-thermal radio emission
• The morphology of the ejecta in Supernova 1987A: a study over time and wavelength
• High-resolution radio observations of SNR 1987A at high frequencies
• Late Spectral Evolution of the Ejecta and Reverse Shock in SN1987A
• Resolution of the Compact Radio Continuum Sources in Arp220
• Radio Evolution of Supernova Remnants Including Non-linear Particle Acceleration: Insights from Hydrodynamic Simulations
• Evolution of the Radio Remnant of Supernova 1987A: Morphological Changes from Day 7000
• Multi-dimensional simulations of the expanding supernova remnant of SN 1987A
• The Re-Acceleration of the Shock Wave in the Radio Remnant of SN 1987A
• Evolution of the Chandra CCD Spectra of SNR 1987A: Probing the Reflected-Shock Picture
• A 3D Simulation of a Type II-P Supernova: from Core Bounce to Beyond Shock Breakout
• Modified equipartition calculation for supernova remnants. Cases α=0.5 and α=1
• Expected gamma-ray emission of supernova remnant SN 1987A
• The remnant of Supernova 1987A resolved at 3 mm wavelength
• Dynamical Evolution and Radiative Processes of Supernova Remnants
• Low Radio Frequency Observations and Spectral Modelling of the Remnant of Supernova 1987A
• The remnant of SN1987A revealed at (sub-)mm wavelengths
• The First VLBI Image of the Young, Oxygen-Rich Supernova Remnant in NGC 4449
• First VLBI Detection of the Radio Remnant of Supernova 1987A: Evidence for Small-scale Features
• Sensitivity of the Cherenkov Telescope Array to TeV photon emission from the Large Magellanic Cloud
• Zooming in on Supernova 1987A at sub-mm wavelengths
• Performing a stellar autopsy using the radio-bright remnant of SN 1996cr
• Re-examination of the Expected gamma-ray emission of supernova remnant SN 1987A
• Discovery of a radio transient in M81
• Polarized radio emission unveils the structure of the pre-supernova circumstellar magnetic field and the radio emission in SN1987A
• Linking gamma-ray spectra of supernova remnants to the cosmic ray injection properties in the aftermath of supernovae
• Modeling particle acceleration and non-thermal emission in supernova remnants
• Radio Observations of Supernova 1987A
• A Possible Gamma-Ray Enhancement Event in Tycho's Supernova Remnant
• The radio remnant of Supernova 1987A at high frequencies and high resolution
• Interacting supernovae and where to find them
• The Radio Remnant of Supernova 1987A - A Broader View