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 x 10(23) cm(-2), (ii) a narrow Fe K alpha line at 6.4 keV, () soft continuum emission well above the extrapolation of the absorbed hard power law and (iv) a narrow emission line at similar to 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.
Comastri, A., Vignali, C., Cappi, M., Matt, G., Audano, R., Awaki, H., et al. (1998). On the nature of the X-ray absorption in the Seyfert 2 galaxy NGC 4507. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 295(2), 443-450 [10.1046/j.1365-8711.1998.01302.x].
On the nature of the X-ray absorption in the Seyfert 2 galaxy NGC 4507
MATT, Giorgio;
1998-01-01
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 x 10(23) cm(-2), (ii) a narrow Fe K alpha line at 6.4 keV, () soft continuum emission well above the extrapolation of the absorbed hard power law and (iv) a narrow emission line at similar to 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
