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Abstract:

H2CO observations in the 110-111 transition (6 cm) obtained with the Very Large Array in the direction of the supernova remnant Cas A are presented. Absorption images are obtained with a resolution of 6″ and a sensitivity of ≳0.003. Molecular structures in the Perseus arm are observed between -34 and -49 km s-1. The distribution of the molecular gas is significantly clumpy. Seventy-two clumps could be identified, with sizes of 0.17 ± 0.05 pc, densities between 0.3 and 14 × 104 cm-3, and masses below 10 M ⊙. In agreement with previous studies, most of the clumps, if not all, appear to be dispersing. The high H2 column density to the west of Cas A accounts for the lack of optical emission in this region. Moreover, the optical extinction, estimated to be 8 mag toward the expansion center of Cas A, might explain why the supernova explosion was not observed in the 17th century. A major objective of the present survey is to search for signs of a possible interaction between Cas A and a western cloud. A striking correlation between the continuum emission and the H2CO absorption distribution, and slight spectral broadenings toward the west, are the only evidence that may suggest that Cas A is interacting with an external cloud. However, the evidence is not enough to draw any definitive conclusion.

Registro:

Documento: Artículo
Título:Very large array observations of 6 centimeter H2CO in the direction of Cassiopeia A
Autor:Reynoso, E.M.; Goss, W.M.
Filiación:Inst. de Astron./Fis. del Espacio, C.C. 67, Sucursal 28, 1428 Buenos Aires, Argentina
School of Physics, University of Sydney, Sydney, NSW 2006, Australia
National Radio Astronomy Observatory, Very Large Array, P.O. Box O, Socorro, NM 87801, United States
Palabras clave:Dust, extinction; ISM: clouds; ISM: individual (Cassiopeia A); ISM: molecules; Supernova remnants
Año:2002
Volumen:575
Número:2 I
Página de inicio:871
Página de fin:885
DOI: http://dx.doi.org/10.1086/341480
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v575_n2I_p871_Reynoso

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Citas:

---------- APA ----------
Reynoso, E.M. & Goss, W.M. (2002) . Very large array observations of 6 centimeter H2CO in the direction of Cassiopeia A. Astrophysical Journal, 575(2 I), 871-885.
http://dx.doi.org/10.1086/341480
---------- CHICAGO ----------
Reynoso, E.M., Goss, W.M. "Very large array observations of 6 centimeter H2CO in the direction of Cassiopeia A" . Astrophysical Journal 575, no. 2 I (2002) : 871-885.
http://dx.doi.org/10.1086/341480
---------- MLA ----------
Reynoso, E.M., Goss, W.M. "Very large array observations of 6 centimeter H2CO in the direction of Cassiopeia A" . Astrophysical Journal, vol. 575, no. 2 I, 2002, pp. 871-885.
http://dx.doi.org/10.1086/341480
---------- VANCOUVER ----------
Reynoso, E.M., Goss, W.M. Very large array observations of 6 centimeter H2CO in the direction of Cassiopeia A. Astrophys. J. 2002;575(2 I):871-885.
http://dx.doi.org/10.1086/341480