Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..645w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, June 1, 1987, p. 645-654.
Astronomy and Astrophysics
Astronomy
31
Energy Spectra, Periodic Variations, Pulse Amplitude, Spectrum Analysis, X Ray Sources, Exosat Satellite, Heao 2, Neutron Stars, Radio Astronomy, X Ray Absorption
Scientific paper
The results of three Exosat observations of X0142+614 made in August 1984 and November and December 1985 are reported. A 25-min coherent modulation was detected during the first observation, but not during the following two. The modulation peak-to-peak amplitude was 55 percent between 3 and 8 keV and less than 1 percent between 1 and 3 keV. The 1-10-keV spectrum was fit with a power law of energy index about 3 in all three observations, except during the observation when X-ray pulsations were detected, when a second power-law component with an energy index of about 1 and a high absorption column density was also required. The data are consistent with the modulation being confined to the flatter spectral component. New position measurements from both Exosat and the Einstein HRI are presented, and a search has been made for an optical counterpart to the X-ray source; no candidate star brigher than R = about 22.5 was found. A radio map of the vicinity of the X-ray source at 5 GHz yielded an upper limit of 5 mJy. The X-ray spectrum is absorbed by the equivalent of 1.5 x 10 to the 22nd H/sq cm which, if interstellar, would cause five magnitudes of extinction in the R-band. The X-ray properties of X0142+614 do not resemble those of any other Galactic or extragalactic X-ray source, and its nature is puzzling.
Angelini Leonardo
Branduardi-Raymont Graziella
Giommi Paolo
Mason Keith O.
Murdin P. G.
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