2011A&A...529A..47M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:36:26

2011A&A...529A..47M - Astronomy and Astrophysics, volume 529A, 47-47 (2011/5-1)

Electron cooling and the connection between expansion and flux-density evolution in radio supernovae.

MARTI-VIDAL I., PEREZ-TORRES M.A. and BRUNTHALER A.

Abstract (from CDS):

Radio supernovae (RSNe) are weak and rare events. Their typical maximum radio luminosities are of the order of only 1027erg/s/Hz. There are, however, very few cases of relatively bright (and/or close) RSNe, from which the expansion of the shock and the radio light curves at several frequencies have been monitored covering several years. Applying the standard model of radio emission from supernovae, it is possible to relate the defining parameters of the modelled expansion curve to those of the modelled light curves in a simple algebraic way by assuming an evolution law for the magnetic field and for the energy density of the population of synchrotron-emitting electrons. However, cooling mechanisms of the electrons may considerably affect this connection between light curves and expansion curve, and lead to wrong conclusions on the details of the electron acceleration and/or on the CSM radial density profile. We study how electron cooling modifies the flux-density decay rate of RSNe for a set of plausible/realistic values of the magnetic field and for different expansion regimes. We use these results to estimate the magnetic fields of different RSNe observed to date and compare them to those obtained by assuming energy equipartition between particles and magnetic fields. For some of the best monitored RSNe, for which deceleration measurements, optically thin spectral index, and power-law time decay have been observed (SN1979C, SN1986J, SN1993J, and SN2008iz), we find self-consistent solutions for the index of the power-law circumstellar density profile (s=2 for all cases), the index of the power-law relativistic electron population (rather steep values, p=2.3-3.0) and the initial magnetic field (ranging from ∼20 to >100G).

Abstract Copyright:

Journal keyword(s): acceleration of particles - radiation mechanisms: nonthermal - radio continuum: stars - supernovae: general

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SN 1986J SN* 02 22 31.33 +42 19 56.4   18.4 18.4     SNII 306 1
2 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1520 2
3 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1253 1
4 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3962 5
5 SN 2008iz SN* 09 55 51.55 +69 40 45.8           SNII: 49 1
6 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5331 6
7 M 100 AGN 12 22 54.9318850854 +15 49 20.294302163 10.04 10.05 9.35     ~ 1646 2
8 SN 1979C SN* 12 22 58.58 +15 47 52.7   11.6       SNIIL 547 1
9 SN 2000ft SN* 23 03 15.45 +08 52 26.5           SNII 34 1
10 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1885 3

    Equat.    Gal    SGal    Ecl

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2020.07.03-22:36:26

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