Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· On-line Data
· References in the article
· Citations to the Article (46) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (2)
· Reads History
·
· Translate This Page
Title:
An X-ray and optical study of the interaction of the Cygnus Loop supernova remnant with an interstellar cloud
Authors:
Graham, James R.; Levenson, N. A.; Hester, J. J.; Raymond, J. C.; Petre, R. 
Affiliation:
AA(Astronomy Department, University of California, Berkeley, California 94720), AB(Astronomy Department, University of California, Berkeley, California 94720), AC(Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287-1504), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AE(Goddard Space Flight Center, Code 666, Greenbelt, MD 20771)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 444, no. 2, p. 787-795 (ApJ Homepage)
Publication Date:
05/1995
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Cygnus Constellation, Explosions, Interstellar Gas, Molecular Clouds, Supernova Remnants, X Ray Astronomy, Emission Spectra, High Resolution, Image Resolution, Line Spectra, Radiative Transfer, Rosat Mission, Shock Waves
DOI:
10.1086/175651
Bibliographic Code:
1995ApJ...444..787G

Abstract

We have used the ROSAT high-resolution imager and optical emission line data to study the structure of a bright optical knot on the southeastern rim of the Cygnus Loop supernova remnant. This knot has been identified as an encounter between the blast wave and a small isolated cloud. The knot appears in projection just behind the blast wave, which is traced by Balmer line filaments which bound the X-ray emission. The knot is a prominent X-ray feature, consisting of a numerb of filaments which are correlated with the optical line emission. These data permit a detailed view of the blast wave interaction. By combining the optical and X-ray data it is possible to trace the blast wave as a continuous surface from its southern edge around the western side of the cloud that then continues on to the north. The southeastern knot is an indentation on the surface of the blast wave. Thus the southeastern knot is not a small cloud that has been overrun by the blast wave, but the tip of a larger cloud. Bright X-ray emission is associated with bright radiative filaments. The location of this emission, upstream of the radiative shocks, implies that the enhanced X-rays come from a reverse shock. The presence of a reverse shock is further evidence that the southeastern knot represents an early stage of a blast wave encountering a large cloud. A consistent picture of the Cygnus Loop as an explosion within a preexisting cavity is emerging. These observations agree with that picture.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences



More Article Retrieval Options

HELP for Article Retrieval


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

  New!

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