Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· References in the article
· Citations to the Article (12) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (12)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Very Large Array Observations of 6 Centimeter H2CO in the Direction of Cassiopeia A
Authors:
Reynoso, E. M.; Goss, W. M.
Affiliation:
AA(Instituto de Astronomía y Física del Espacio, C.C. 67, Sucursal 28, 1428 Buenos Aires, Argentina and School of Physics, University of Sydney, 2006 NSW, Australia; ), AB(National Radio Astronomy Observatory, Very Large Array, P.O. Box O, Socorro, NM 87801)
Publication:
The Astrophysical Journal, Volume 575, Issue 2, pp. 871-885. (ApJ Homepage)
Publication Date:
08/2002
Origin:
UCP
ApJ Keywords:
ISM: Dust, Extinction, ISM: Clouds, ISM: Individual: Name: Cassiopeia A, ISM: Molecules, ISM: Supernova Remnants
DOI:
10.1086/341480
Bibliographic Code:
2002ApJ...575..871R

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 Msolar. 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.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints