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)
· References in the article
· Citations to the Article (7) (Citation History)
· Refereed Citations to the Article
· Reads History
·
· Translate This Page
Title:
Evidence for a compact source of soft X-rays in the Cygnus Loop
Authors:
Bleach, R. D.; Meekins, J. F.; Fritz, G.; Shulman, S. D.; Friedman, H.; Henry, R. C.
Affiliation:
AA(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, D.C; Maryland, University, College Park, Md.), AB(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, D.C.), AC(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, D.C.), AD(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, D.C.), AE(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, D.C.)
Publication:
Astrophysical Journal, vol. 197, Apr. 1, 1975, pt. 2, p. L13-L17. (ApJL Homepage)
Publication Date:
04/1975
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Black Holes (Astronomy), Nebulae, Pulsed Radiation, X Ray Sources, Aerobee Rocket Vehicle, Cygnus Constellation, Periodic Variations, Power Spectra, Proportional Counters, Rocket-Borne Instruments, X Ray Density Measurement
DOI:
10.1086/181765
Bibliographic Code:
1975ApJ...197L..13B

Abstract

X-ray data (44-60 A), which was obtained in a 3-second scan of the Cygnus Loop from an Aerobee rocket, is presented as evidence that a compact object, possibly a black hole, is present within the nebula. The techniques for obtaining the periodic emission and for testing the statistical significance of the result are described, and a 21.4-ms periodicity is found. It is shown that when the pulsed fraction of 50 to 60% is removed, the residual intensity agrees well with previously reported values of the mean Loop intensity. It is suggested that, because of the time scale of the periodicity, the pulsed contribution is due to a compact object in the Loop, which may be variable in both the intensity and spectrum of its emitted X-rays.

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