Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...463..134t&link_type=abstract
Astrophysical Journal v.463, p.134
Astronomy and Astrophysics
Astronomy
15
Galaxies: Seyfert, Galaxies: Individual Alphanumeric: Exo 055620-3820.2, X-Rays: Galaxies
Scientific paper
We report the results from an ASCA observation which yields the first uncontaminated hard X-ray spectrum of the Seyfert 1 galaxy EXO 055620 - 3820.2. We find the source spectrum to exhibit a complex structure below 2 keV, indicating that the continuum is attenuated either by an ionized absorber fully or partially covering the X-ray source, or a neutral absorber partially covering the source. While the X-ray data alone do not allow us to distinguish between these models, consideration of the optical properties of this highly reddened nucleus suggests that partial covering by neutral material is unlikely, as it implies an unusually large intrinsic optical flux. We find a good fit to the X-ray data, and consistency with the observed optical properties of the source, with either 96% of the source covered by a column of 3.1 x 10^22^ cm^-2^ of low-ionization gas or full covering by a column of 3.6 x 10^22^ cm^-2 of highly ionized gas. Both models required extinction of the optical continuum by dust in the host galaxy with A_V_ ~ 2 mag. We find evidence for a column of neutral material associated with this dust. The partial- covering models leave a residual soft excess below 1 keV, and the possible origin of this soft emission is also discussed. We detect an iron K-shell emission line, which appears to be significantly broad, with an equivalent width (~300 eV) exceeding that predicted from the absorbing material along the line of sight. The line is consistent with emission from neutral iron, and we find a FWHM for the line of 31,000-77,000 km s^-1^ similar to several other Seyfert spectra reported recently.
George Ian Michael
Netzer Hagai
Turner Tracey Jane
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