Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224l.103s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 224, Sept. 15, 1978, p. L103-L105.
Astronomy and Astrophysics
Astrophysics
28
Galactic Nuclei, Galactic Radiation, Heao, X Ray Sources, Collimators, Compton Effect, Electromagnetic Spectra, Quasars, Seyfert Galaxies
Scientific paper
The scanning modulation collimator (MC) experiment on HEAO 1 has reduced
the size of the location uncertainty of 4U 1651+39 by a factor of 100,
to four possible positions with a total area of about 5 square arcmin.
One of these positions contains the galaxy Markarian 501, including the
BL Lacertae-type nucleus of that galaxy.
Bradt Hale V.
Doxsey Rodger Evans
Griffiths Richard E.
Gursky Herbert
Johnston Matthew D.
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