The discovery of an O VII emission line in the ASCA spectrum of the Seyfert galaxy NGC 3783

Details The discovery of an O VII emission line in the ASCA spectrum of the Seyfert galaxy NGC 3783 The discovery of an O VII emission line in the ASCA spectrum of the Seyfert galaxy NGC 3783

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...438l..67g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 438, no. 2, p. L67-L70

Astronomy and Astrophysics

Astronomy

50

Galactic Nuclei, K Lines, Red Shift, Seyfert Galaxies, Spectrum Analysis, X Ray Astronomy, X Ray Sources, X Ray Spectra, Continuum Mechanics, Imaging Spectrometers, Mathematical Models, Power Series, Solid State Devices, Stellar Models

Scientific paper

We report the first observation of an O VII 0.57 keV emission line in a Seyfert 1 galaxy. NGC 3783 was observed by ASCA twice over a period of 4 days in 1993 December. The source exhibited a approximately 30% change in intensity between the two observations, with most of the variability taking place as a result of steepening of the continuum less than or approximately equal to 1 keV. Spectra from both observations show intense absorption features in the 0.5-1.5 keV band, which can be well fitted by an ionized absorber model of solar composition, column density of 1022.2/sq cm and ionization parameter of approximately 7-8; the strongest absorption features being due to O VII and O VIII. Two emission features are also seen in the spectra which we identify as O VII 0.57 keV (equivalent width approximately equals 36 eV) and O VIII 0.65 keV (equivalent width approximately equals 11 eV). We also show that the 3-6 keV continuum of the source is well fitted by a Gamma = 1.3-1.4 power-law continuum, a narrow neutral iron K-shell fluorescence line and a strong iron K-shell absorption edge, possibly corresponding to highly ionized iron.

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