Search for thermal X-ray line emission from the Crab Nebula

Journal Article · Mon Aug 15 04:00:00 EDT 1977 · Astrophys. J., Lett.; (United States)

DOI:https://doi.org/10.1086/182502· OSTI ID:7289127

Kestenbaum, H L; Wolff, R S; Long, K S; Novick, R; Weisskopf, M C

Observations of the Crab Nebula from 1.85 to 8 keV obtained with the large-area graphite crystal spectrometer on OSO-8 show a smooth, featureless continuum with an absence of X-ray emission lines from highly ionized Si and S. Upper limits on the line emission are used to derive an upper limit to the emission measure for a thermal source associated with the Crab Nebula. We discuss existing evidence for an extended thermal source and show that the evidence is not contradicted by the upper limits set with the spectrometer data.

• Research Organization: Columbia Astrophysics Laboratory, Columbia University
• OSTI ID: 7289127
• Journal Information: Astrophys. J., Lett.; (United States), Journal Name: Astrophys. J., Lett.; (United States) Vol. 216:1; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
CRAB NEBULA
INTERSTELLAR GRAINS
IONIZATION
NEBULAE
PARTICLES
PLASMA
SHOCK WAVES
SPECTRA
SUPERNOVA REMNANTS
X-RAY SPECTRA