Hard X-ray emission from the Carina Nebula

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169256· OSTI ID:6163676

Koyama, Katsuji; Asaoka, Ikuko; Ushimaru, Naoko; Yamauchi, Shigeo; Corbet, R H.D. ^[1]

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1. Nagoya Univ. (Japan) Institute of Space and Astronautical Science, Sagamihara (Japan)

Hard X-rays above a few keV from the Carina nebula were observed with the Ginga satellite. The hard X-ray emission was found to originate in a region less than 0.15 deg radius from Eta Car. The X-ray spectrum can be described by emission from a thin hot plasma with a temperature of 4.1 keV. The intensity is consistent with the results of previous observations made with large field-of-view instruments, providing allowance is made for emission from the Galactic ridge; however, it is about twice as large as that obtained by the smaller field-of-view SSS on board the Einstein Observatory. At least some of the hard X-ray emission may be extended with a diameter of 0.1-0.3 deg. The X-ray flux from the Eta Car region shows no intensity variations on a time scale between several seconds and 10 yr at a level greater than 30 percent. 17 refs.

• OSTI ID: 6163676
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 362; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BINARY STARS
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELECTROMAGNETIC RADIATION
GALAXIES
HARD X RADIATION
HOT PLASMA
IONIZING RADIATIONS
MILKY WAY
NEBULAE
PLASMA
RADIATIONS
SATELLITES
SPECTRA
STARS
STELLAR ATMOSPHERES
STELLAR CORONAE
VARIATIONS
X RADIATION
X-RAY SPECTRA