2002A&A...394...71P


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST13:35:45

2002A&A...394...71P - Astronomy and Astrophysics, volume 394, 71-76 (2002/10-4)

The late-time radio spectrum of SN 1993J.

PEREZ-TORRES M.A., ALBERDI A. and MARCAIDE J.M.

Abstract (from CDS):

We present VLA radio continuum measurements of SN 1993J in M 81 at the frequencies of 0.32 (P-band), 1.3 and 1.7 (L-band), 4.9 (C-band), 8.5 (X-band), and 14.9 (U-band) GHz carried out on December 17 and 21, 2000, about 2820 days after the supernova explosion. We find that a power-law spectrum, free-free absorbed by an homogeneous, or clumpy, distribution of ionized gas yields the best fit to the radio data. A combined homogeneous-clumpy model is not favored, but neither totally excluded. This result contrasts with the modeling of the early (t≲230 days) radio emission from SN 1993J, where a mixture of homogeneous and clumpy absorbers appeared to be necessary to adequately describe the behavior of the light curves. The radio spectrum of supernova SN 1993J between 0.32 and 14.9GHz is well characterized by α=-0.67±0.02 (Sν∝να), typical of an optically thin radio supernova. A fit to the radio spectra of SN 1993J from ∼70 up to 2820 days shows that the observed spectral index of SN 1993J has been slowly evolving since t∼1000 days, with the observed spectral index changing from α≃-1 to α=-0.67. This spectral evolution seems to suggest that, in addition to the radiative (synchrotron) losses, adiabatic cooling and ionization (Coulomb) losses at the lowest frequencies might be contributing significantly to the integrated electron spectrum.

Abstract Copyright:

Journal keyword(s): techniques: interferometric - supernovae: individual: SN 1993J - ISM: supernova remnants - radio continuum: stars - galaxies: individual: M 81

Simbad objects: 8

goto Full paper

goto View the reference in ADS

Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4578 2
2 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1309 1
3 6C 091739+622838 QSO 09 21 36.23106854 +62 15 52.1803472   19.76 19.26 18.96   ~ 323 1
4 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1287 1
5 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4056 5
6 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5445 6
7 3C 268.3 Sy1 12 06 24.70656 +64 13 36.8760   21.847 20.790 19.910   ~ 182 1
8 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3857 2

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2002A&A...394...71P and select 'bookmark this link' or equivalent in the popup menu


2021.04.18-13:35:45

© Université de Strasbourg/CNRS

    • Contact