Artículo
Reynoso, E.M.; Goss, W.M.; Dubner, G.M.; Winkler, P.F.; Schwarz, U.J. "Neutral hydrogen compact absorption features in Cassiopeia A" (1997) Astronomy and Astrophysics. 317(1):203-211
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Abstract:
Very Large Array (VLA) observations of the λ21 cm H I line towards Cassiopeia A (Cas A) have been performed. The velocity interval observed was from -38 to -362 (LSR) km s -1, with a resolution of 2.6 km s -1 and a beam size of 14.2″ × 11.4×. Opacity images show the presence of a number of small absorption H I features in the velocity interval -62 to -69 km s -1 (LSR) which, on the basis of several arguments, are postulated to be physically associated with Cas A. These cold H I knots have sizes of < 0.1 pc and show spatial substructure. Their velocities lie well outside the range of the intervening H I in the Perseus spiral arm, i.e. 0 to -55 km s -1. We demonstrate that the H I knots cannot be described as shocked interstellar cloudlets engulfed by the blast wave of the supernova remnant (SNR). Instead, we propose that these low velocity H I features are recombined wind driven clumps moving ahead of the supernova (SN) shock front. This hypothesis is supported by the ages derived for the knots, varying from 8 × 10 3 to 5 × 10 4 years, which implies that these features were originally accelerated during the Wolf-Rayet (WR) phase of the precursor star.
Registro:
| Documento: | Artículo |
| Título: | Neutral hydrogen compact absorption features in Cassiopeia A |
| Autor: | Reynoso, E.M.; Goss, W.M.; Dubner, G.M.; Winkler, P.F.; Schwarz, U.J. |
| Filiación: | Inst. Astronomia y Fis. del Espacio, C.C.67, Suc. 28, 1428 Buenos Aires, Argentina National Radio Astronomy Observatory, Very Large Array, P.O. Box 0, Socorro, NM 87801, United States Department of Physics, Middlebury College, Middlebury, VT 05753, United States Kapteyn Astronomical Institute, Postbus 800, NL-9700 AV Groningen, Netherlands CONICET, Argentina Carrera del Investigador Cie., CONICET, Argentina Kitt Peak National Observatory, Assoc. Universities Res. in Astron., National Science Foundation, United States |
| Palabras clave: | ISM: individual: Cas A; ISM: supernova remnants; Stars: mass loss |
| Año: | 1997 |
| Volumen: | 317 |
| Número: | 1 |
| Página de inicio: | 203 |
| Página de fin: | 211 |
| Título revista: | Astronomy and Astrophysics |
| Título revista abreviado: | Astron. Astrophys. |
| ISSN: | 00046361 |
| CODEN: | AAEJA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v317_n1_p203_Reynoso |
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Citas:
---------- APA ----------
Reynoso, E.M., Goss, W.M., Dubner, G.M., Winkler, P.F. & Schwarz, U.J. (1997) . Neutral hydrogen compact absorption features in Cassiopeia A. Astronomy and Astrophysics, 317(1), 203-211.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v317_n1_p203_Reynoso [ ]
---------- CHICAGO ----------
Reynoso, E.M., Goss, W.M., Dubner, G.M., Winkler, P.F., Schwarz, U.J. "Neutral hydrogen compact absorption features in Cassiopeia A" . Astronomy and Astrophysics 317, no. 1 (1997) : 203-211.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v317_n1_p203_Reynoso [ ]
---------- MLA ----------
Reynoso, E.M., Goss, W.M., Dubner, G.M., Winkler, P.F., Schwarz, U.J. "Neutral hydrogen compact absorption features in Cassiopeia A" . Astronomy and Astrophysics, vol. 317, no. 1, 1997, pp. 203-211.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v317_n1_p203_Reynoso [ ]
---------- VANCOUVER ----------
Reynoso, E.M., Goss, W.M., Dubner, G.M., Winkler, P.F., Schwarz, U.J. Neutral hydrogen compact absorption features in Cassiopeia A. Astron. Astrophys. 1997;317(1):203-211.Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v317_n1_p203_Reynoso [ ]
