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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" (1997) Astrophysical Journal. 491(2 PART I):816-828
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Abstract:

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.

Registro:

Documento: Artículo
Título:A vla study of the expansion of tycho's supernova remnant
Autor:Reynoso, E.M.; Moffett, D.A.; Goss, W.M.; Dubner, G.M.; Dickel, J.R.; Reynolds, S.P.; Giacani, E.B.
Filiación:Institute de Astronomia y Fisica del Espacio, C.C. 67, Sucursal 28, 1428 Buenos Aires, Argentina
Department of Physics and Astronomy, New Mexico Institute of Mining and Technology, Socorro, NM 87801, United States
National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, United States
Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801, United States
Department of Physics, North Carolina State University, P.O. Box 8202, Raleigh, NC 27695-8202, United States
Instituto de Astronomia y Fisica del Espacio, C.C. 67, Sucursal 28, 1428 Buenos Aires, Argentina
CONICET, Argentina
Physics Department, University of Tasmania, GPO Box 252-21, Hobart TAS 7001, Australia
Carrera del Investigador Cientifico of CONICET, Argentina
Palabras clave:ISM: Individual (Tycho, 3C 10); ISM: Kinematics and dynamics supernova remnants
Año:1997
Volumen:491
Número:2 PART I
Página de inicio:816
Página de fin:828
DOI: http://dx.doi.org/10.1086/304997
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v491_n2PARTI_p816_Reynoso

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Citas:

---------- APA ----------
Reynoso, E.M., Moffett, D.A., Goss, W.M., Dubner, G.M., Dickel, J.R., Reynolds, S.P. & Giacani, E.B. (1997) . A vla study of the expansion of tycho's supernova remnant. Astrophysical Journal, 491(2 PART I), 816-828.
http://dx.doi.org/10.1086/304997
---------- CHICAGO ----------
Reynoso, E.M., Moffett, D.A., Goss, W.M., Dubner, G.M., Dickel, J.R., Reynolds, S.P., et al. "A vla study of the expansion of tycho's supernova remnant" . Astrophysical Journal 491, no. 2 PART I (1997) : 816-828.
http://dx.doi.org/10.1086/304997
---------- MLA ----------
Reynoso, E.M., Moffett, D.A., Goss, W.M., Dubner, G.M., Dickel, J.R., Reynolds, S.P., et al. "A vla study of the expansion of tycho's supernova remnant" . Astrophysical Journal, vol. 491, no. 2 PART I, 1997, pp. 816-828.
http://dx.doi.org/10.1086/304997
---------- VANCOUVER ----------
Reynoso, E.M., Moffett, D.A., Goss, W.M., Dubner, G.M., Dickel, J.R., Reynolds, S.P., et al. A vla study of the expansion of tycho's supernova remnant. Astrophys. J. 1997;491(2 PART I):816-828.
http://dx.doi.org/10.1086/304997