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 |
Referencias:
- Anderson, M.C., Rudnick, L., (1995) ApJ, 441, p. 307
- Baade, W., (1945) ApJ, 102, p. 309
- Chevalier, R.A., (1981) ApJ, 246, p. 267
- (1982) ApJ, 258, p. 790
- (1982) ApJ, 259, pp. L85
- Cioffi, D.F., McKee, C.F., Bertschinger, E., (1988) ApJ, 334, p. 252
- Colgate, S.A., McKee, C., (1969) ApJ, 157, p. 623
- Dickel, J.R., Eilek, J.A., Jones, E.M., Reynolds, S.P., (1989) ApJS, 70, p. 497
- Dickel, J.R., Sault, R., Arendt, R.G., Matsui, Y., Korista, K.T., (1988) ApJ, 330, p. 254
- Dickel, J.R., Van Breugel, W.J.M., Strom, R.G., (1991) AJ, 101, p. 2151
- Dohm-Palmer, R.C., Jones, T.W., (1996) ApJ, 471, p. 279
- Duin, R.M., Strom, R.G., (1975) A&A, 39, p. 33
- Fomalont, E.B., Goss, W.M., Lyne, A.G., Manchester, R.N., Justtanont, K., (1992) MNRAS, 258, p. 497
- Green, D.A., Gull, S.F., (1983) IAU Symp., 101, p. 329. , Supernova Remnants and Their X-Ray Emission, ed. I. J. Danziger & P. Gorenstein (Dordrecht :Reidel)
- Gull, S.F., Pooley, G.G., (1980) New Sci., 87, p. 923
- Hughes, J.P., (1997) BAAS, 190. , No. 37.03
- Kamper, K.W., Van Den Bergh, S., (1978) ApJ, 224, p. 85
- Long, K.S., Blair, W.P., Van Den Bergh, S., (1988) ApJ, 333, p. 749
- Masson, C.R., (1989) ApJ, 336, p. 294
- McKee, C.F., (1982) Supernovae: A Survey of Current Research, p. 433. , ed. M. J. Rees & R. J. Stoneham (NATO ASI Ser. C, 90) (Dordrecht : Reidel)
- McKee, C.F., Cowie, L.L., (1975) ApJ, 195, p. 715
- McKee, C.F., Ostriker, J.P., (1977) ApJ, 218, p. 148
- Moffett, D.A., Goss, W.M., Reynolds, S.P., (1993) AJ, 106, p. 1566
- Sault, R.J., Teuben, P.J., Vright, M.C.H., (1995) ASP. Conf. Ser., 77, p. 443. , Astronomical Data Analysis Software and Systems IV, ed. R. A. Shaw, H. E. Payne, & J. J. E. Hayes (San Francisco: ASP)
- Shklovskii, I.S., (1968) Supernovae, , London: Wiley
- Schwarz, U.J., Goss, W.M., Kalberia, P.M., Benaglia, P., (1995) A&A, 299, p. 193
- Seward, F., Gorenstein, P.W., Tucker, W., (1983) ApJ, 266, p. 287
- Smith, R.C., Kirshner, R.P., Blair, W.P., Winkler, P.F., (1991) ApJ, 375, p. 652
- Strom, R.G., Goss, W.M., Shaver, P.A., (1982) MNRAS, 200, p. 473
- Tan, S.M., Gull, S.F., (1985) MNRAS, 216, p. 949
- Tuffs, R.J., (1986) MNRAS, 219, p. 13
- Bergh, S., Kamper, K.W., (1983) ApJ, 268, p. 129
- Bergh, S., Marscher, A.P., Terzian, Y., (1973) ApJS, 26, p. 19
- Vancura, O., Gorenstein, P., Hughes, J.P., (1995) ApJ, 441, p. 680
- Woltjer, L., (1972) ARA&A, 10, p. 129
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