X-Ray Spectral Variability of the Seyfert Galaxy NGC 4051 Observed with Suzaku

Details X-Ray Spectral Variability of the Seyfert Galaxy NGC 4051 Observed with Suzaku X-Ray Spectral Variability of the Seyfert Galaxy NGC 4051 Observed with Suzaku

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61s.299t&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.61, No.SP1, pp.S299--S316

Astronomy and Astrophysics

Astronomy

3

Galaxies: Active, Galaxies: Individual (Ngc 4051), X-Rays: Galaxies

Scientific paper

We report on results from a Suzaku observation of the narrow-line Seyfert 1 NGC 4051. During our observation, large-amplitude rapid variability was seen, and the averaged 2--10keV flux was 8.1×10-12erg s-1cm-2, which is several times lower than the historical average. The X-ray spectrum hardens when the source flux becomes lower, confirming the trend of spectral variability known for many Seyfert 1 galaxies. The broad-band averaged spectrum and spectra in high- and low-flux intervals were analyzed. The spectra were first fitted with a model consisting of a power-law component, a reflection continuum originating in cold matter, a blackbody component, two zones of ionized absorber, and several Gaussian emission lines. The amount of reflection is rather large (R ˜ 7, where R = 1 corresponds to reflection by an infinite slab), while the equivalent width of the Fe-K line at 6.4keV is modest (140eV) for the averaged spectrum. We then modeled the overall spectra by introducing partial covering for the power-law component and reflection continuum independently. The column density for the former is 1×1023cm-2, while it is fixed at 1×1024cm-2 for the latter. By comparing the spectra in different flux states, we could identify the causes of spectral variability.

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