Rapid soft X-ray variability in a newly discovered active galaxy - EXO 1128+691

Details Rapid soft X-ray variability in a newly discovered active galaxy - EXO 1128+691 Rapid soft X-ray variability in a newly discovered active galaxy - EXO 1128+691

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.234..319b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 234, Sept. 15, 1988, p. 319-324.

Astronomy and Astrophysics

Astronomy

5

Active Galactic Nuclei, Black Holes (Astronomy), Red Shift, Seyfert Galaxies, X Ray Sources, Exosat Satellite, Variable Stars

Scientific paper

A previously unknown active galaxy has been discovered, and has been tentatively identified as a Seyfert type 1. The X-ray emission differs from that for "normal" Seyferts in that it is very soft and also shows rapid variability (≡15 min to 2 hr). Assuming the galactic value NH ≅ 1.5×2020cm-2 for the column density leads to a power-law spectral index αE ≅ 4, or T ≅ 6×105K for a thermal spectrum for single component models. A separate soft component is suggested. EXO 1128+691 has LX ≡ 1-3×1043erg s-1 (0.05 - 2 keV) for NH ≅ 1.5×1020cm-2, using the measured redshift z = 0.043±0.002.

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