NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login

Press Enter or click the Search button to begin your search.

Back to Results
X-ray observations of BL Lac objectsThe BL Lac objects MK501 and MK421 have been observed by the HEAO-1 experiment A-2 in the 2-60-keV band. Their spectra are similar with best-fitting power laws having an energy index between -0.2 and 0.2. There was no detectable X-ray absorption with implied column densities of less than 1.5 x 10 to the 22nd H atoms/sq cm. MK421 was a factor 6 weaker in November 1977 then in May 1977. A new identification of PKS0548-322 with a source near 4U 0543-31 is suggested.
Document ID
19790046025
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Mushotzky, R. F. (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)
Serlemitsos, P. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Swank, J. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rothschild, R. H. (NASA Goddard Space Flight Center Laboratory for High Energy Astrophysics, Greenbelt, Md., United States)
Pravdo, S. H. (NASA Goddard Space Flight Center Laboratory for High Energy Astrophysics, Greenbelt; Maryland, University, College Park, Md., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1978
Subject Category
Astrophysics
Meeting Information
Meeting: Pittsburgh Conference on BL Lac Objects
Location: Pittsburgh, PA
Start Date: April 24, 1978
End Date: April 26, 1978
Sponsors: NSF
Accession Number
79A30038
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.

Related Records

There are no records associated with this record.
No Preview Available