On the nature of the X-ray absorption in the Seyfert
2 galaxy NGC 4507 |
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| Authors: | AComastri CVignali MCappi GMatt RAudano HAwaki SUeno |
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| Institution: | Osservatorio Astronomico di Bologna, via Zamboni 33, I-40126 Bologna, Italy; Dipartimento di Astronomia, Universitádi Bologna, via Zamboni 33, I-40126 Bologna, Italy; Istituto per le Tecnologie e Studio Radiazioni Extraterrestre/CNR, via Gobetti 101, I-40129 Bologna, Italy; The Institute for Physical and Chemical Research RIKEN, Wako-shi, Saitama 351-01, Japan; Dipartimento di Fisica, Universitádegli Studi 'Roma Tre', via della Vasca Navale 84, I-00146 Roma, Italy; Department of Physics, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan; X-ray Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH |
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| Abstract: | We present results of the ASCA observation of the Seyfert 2 galaxy NGC 4507. The 0.5–10 keV spectrum is rather complex and consists of several components: (i) a hard X-ray power law heavily absorbed by a column density of about 3-1023 cm?2, (ii) a narrow Fe Kα line at 6.4 keV, (iii) soft continuum emission well above the extrapolation of the absorbed hard power law and (iv) a narrow emission line at ～0.9 keV. The line energy, consistent with highly ionized neon (Ne IX ), may indicate that the soft X-ray emission is derived from a combination of resonant scattering and fluorescence in a photoionized gas. Some contribution to the soft X-ray spectrum from thermal emission, as a blend of Fe L lines, by a starburst component in the host galaxy cannot be ruled out with the present data. |
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| Keywords: | galaxies: active galaxies: individual: NGC 4507 galaxies: Seyfert X-rays: galaxies |
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