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Centaurus A /NGC 5128/ at 2 keV-2.3 MeV - HEAO 1 observations and implicationsThe active-nucleus galaxy Centaurus A has been studied at 2 keV-2.3 MeV using data from the UCSD/MIT hard X-ray and low-energy gamma-ray instrument and the GSFC/CIT cosmic X-ray experiment on HEAO-1. It is found that an E exp -1.60 + or - 0.03 power law spectrum breaking to E exp -2.0 + or - 0.2 at 140 keV best describes the January and July 1978 data. The average intensity was 50% higher during the January observations. Upper limits to unresolved lines at 511 keV and 1.6 MeV were found to be 6.5 x 10 to the -4th photons/sq cm-s and 2.2 x 10 to the -4th photons/sq cm-s, respectively, at the 90% confidence level. The present data are consistent with the detailed calculations of the synchrotron self-Compton mechanism; they may also agree, marginally, with the predictions of emission from spherical accretion onto black holes.
Document ID
19810046652
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Baity, W. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rothschild, R. E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lingenfelter, R. E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Stein, W. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nolan, P. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gruber, D. E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Knight, F. K.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Matteson, J. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Peterson, L. E.
(California, University La Jolla, Calif., United States)
Mushotzky, R. F.
(NASA Goddard Space Flight Center Laboratory for High Energy Astrophysics, Greenbelt, Md., United States)
Date Acquired
August 11, 2013
Publication Date
March 1, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
Astronomy
Accession Number
81A31056
Funding Number(s)
CONTRACT_GRANT: NAS8-27974
CONTRACT_GRANT: NAS8-27975
Distribution Limits
Public
Copyright
Other

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