Query : 2010A&A...509A..99S

2010A&A...509A..99S - Astronomy and Astrophysics, volume 509, A99-99 (2010/1-1)

Low frequency observations of the radio nebula produced by the giant flare from SGR 1806-20. Polarimetry and total intensity measurements.


Abstract (from CDS):

The 2004 december 27 giant flare from SGR 1806-20 produced a radio nebula that was detectable for weeks. It was observed at a wide range of radio frequencies. To investigate the polarized signal from the radio nebula at low frequencies and to perform precise total intensity measurements. We made a total of 19 WSRT observations. Most of these were performed quasi simultaneously at either two or three frequencies, starting 2005 january 4 and ending 2005 january 29. We reobserved the field in 2005 april/may, which facilitated an accurate subtraction of background sources. At 350MHz, we find that the total intensity of the source is lower than expected from the GMRT 240MHz and 610MHz measurements and inconsistent with spectral indices published previously. Our 850MHz flux densities, however, are consistent with earlier results. There is no compelling evidence for significant depolarization at any frequency. We do, however, find that polarization angles differ substantially from those at higher frequencies. Low frequency polarimetry and total intensity measurements provide a number of clues with regard to substructure in the radio nebula associated with SGR 1806-20. In general, for a more complete understanding of similar events, low frequency observations can provide new insights into the physics of the radio source.

Abstract Copyright:

Journal keyword(s): stars: individual: SGR 1806-20 - stars: neutron - radio continuum: stars

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2731 2
2 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4189 2
3 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1203 2
4 PSR B1937+21 Psr 19 39 39.6 +21 37 22           ~ 1035 2

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