A vla study of the expansion of tycho's supernova remnant

We have measured the expansion of Tycho's supernova remnant (SNR) over a 10 yr interval by comparing new VLA observations at 1375 MHz made in 1994 and 1995 with previous observations made in 1983 and 1984 using the same array configurations, bandwidths, calibrators, and integration times. To co...

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Autores principales: Reynoso, E.M., Moffett, D.A., Goss, W.M., Dubner, G.M., Dickel, J.R., Reynolds, S.P., Giacani, E.B.
Formato: JOUR
Materias:
ISM: Individual (Tycho, 3C 10)
ISM: Kinematics and dynamics supernova remnants
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0004637X_v491_n2PARTI_p816_Reynoso
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_0004637X_v491_n2PARTI_p816_Reynoso2023-10-03T14:01:43Z A vla study of the expansion of tycho's supernova remnant Reynoso, E.M. Moffett, D.A. Goss, W.M. Dubner, G.M. Dickel, J.R. Reynolds, S.P. Giacani, E.B. ISM: Individual (Tycho, 3C 10) ISM: Kinematics and dynamics supernova remnants We have measured the expansion of Tycho's supernova remnant (SNR) over a 10 yr interval by comparing new VLA observations at 1375 MHz made in 1994 and 1995 with previous observations made in 1983 and 1984 using the same array configurations, bandwidths, calibrators, and integration times. To compute the expansion of the outer rim, we estimate the expansion rate for radial sectors of 4°. The overall mean expansion obtained is 3″.05 but varies between 1″ and 5″ around the shell. The weighted average fractional expansion rate is 0.1126% yr -1 , corresponding to a power-law index (expansion parameter) v = dlnR/dlnt = 0.471, with an error of ∼6%. We also compute the expansion of interior features, and find a comparable global expansion parameter. The value of v obtained is in excess of the pure Sedov value of 0.4, indicating that Tycho's SNR is still in transition from an earlier phase to the Sedov adiabatic phase of evolution, and supporting expansion into a medium without a strong radial density gradient, as expected for a Type la supernova. In addition, the significant local variations that we observe suggest that a unique average expansion rate is an oversimplified description for Tycho. Both radio flux and polarization were found to remain almost constant during the intervening 10 years. © 1997. The American Astronomical Society. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v491_n2PARTI_p816_Reynoso
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic ISM: Individual (Tycho, 3C 10)
ISM: Kinematics and dynamics supernova remnants
spellingShingle ISM: Individual (Tycho, 3C 10)
ISM: Kinematics and dynamics supernova remnants
Reynoso, E.M.
Moffett, D.A.
Goss, W.M.
Dubner, G.M.
Dickel, J.R.
Reynolds, S.P.
Giacani, E.B.
A vla study of the expansion of tycho's supernova remnant
topic_facet ISM: Individual (Tycho, 3C 10)
ISM: Kinematics and dynamics supernova remnants
description We have measured the expansion of Tycho's supernova remnant (SNR) over a 10 yr interval by comparing new VLA observations at 1375 MHz made in 1994 and 1995 with previous observations made in 1983 and 1984 using the same array configurations, bandwidths, calibrators, and integration times. To compute the expansion of the outer rim, we estimate the expansion rate for radial sectors of 4°. The overall mean expansion obtained is 3″.05 but varies between 1″ and 5″ around the shell. The weighted average fractional expansion rate is 0.1126% yr -1 , corresponding to a power-law index (expansion parameter) v = dlnR/dlnt = 0.471, with an error of ∼6%. We also compute the expansion of interior features, and find a comparable global expansion parameter. The value of v obtained is in excess of the pure Sedov value of 0.4, indicating that Tycho's SNR is still in transition from an earlier phase to the Sedov adiabatic phase of evolution, and supporting expansion into a medium without a strong radial density gradient, as expected for a Type la supernova. In addition, the significant local variations that we observe suggest that a unique average expansion rate is an oversimplified description for Tycho. Both radio flux and polarization were found to remain almost constant during the intervening 10 years. © 1997. The American Astronomical Society. All rights reserved.
format JOUR
author Reynoso, E.M.
Moffett, D.A.
Goss, W.M.
Dubner, G.M.
Dickel, J.R.
Reynolds, S.P.
Giacani, E.B.
author_facet Reynoso, E.M.
Moffett, D.A.
Goss, W.M.
Dubner, G.M.
Dickel, J.R.
Reynolds, S.P.
Giacani, E.B.
author_sort Reynoso, E.M.
title A vla study of the expansion of tycho's supernova remnant
title_short A vla study of the expansion of tycho's supernova remnant
title_full A vla study of the expansion of tycho's supernova remnant
title_fullStr A vla study of the expansion of tycho's supernova remnant
title_full_unstemmed A vla study of the expansion of tycho's supernova remnant
title_sort vla study of the expansion of tycho's supernova remnant
url http://hdl.handle.net/20.500.12110/paper_0004637X_v491_n2PARTI_p816_Reynoso
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