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A new X-ray spectral observation of NGC 1068A new X-ray observation of NGC 1068, in which improved spectral resolution (R is approximately equal to 40) and broad energy range provide important new constraints on models for this galaxy, is reported. The observed X-ray continuum of NGC 1068 from 0.3 to 10 keV is well fitted as the sum of two power-law spectra with no evidence for absorption intrinsic to the source. Strong Fe K emission lines with a total equivalent width of 2700 eV were detected due to iron less ionized than Fe XX and to iron more ionized than Fe XXIII. No evidence was seen for lines due to the recombination of highly ionized oxygen with an upper limit for the O Ly-alpha emission line of 40 eV. The discovery of multiple Fe K and Fe L emission lines indicates a broad range of ionization states for this gas. The X-ray emission from the two components is modeled for various geometries using a photoionization code that calculates the temperature and ionization state of the gas. Typical model parameters are a total Compton depth of a few percent, an inner boundary of the hot component of about 1 pc, and an inner boundary of the warm component of about 20 pc.
Document ID
19930044642
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Marshall, F. E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Netzer, H.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Arnaud, K. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Boldt, E. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Holt, S. S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jahoda, K. M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kelley, R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mushotzky, R. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Petre, R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Serlemitsos, P. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
March 1, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 405
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A28639
Funding Number(s)
CONTRACT_GRANT: NSF BSF-89-00179
Distribution Limits
Public
Copyright
Other

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