We report on the BeppoSAX detection of a hard X-ray excess in the X-ray spectrum of the classical high-ionization Seyfert 2 galaxy Tot 0109-383. The X-ray emission of this source observed below 7 keV is dominated by reflection from both cold and ionized gas, as seen in the ASCA data. The excess hard X-ray emission is presumably caused by the central source absorbed by an optically thick obscuring torus with N-H similar to 2 x 10(24) cm(-2). The strong cold X-ray reflection, if it is produced at the inner surface of the torus, is consistent with the picture where much of the inner nucleus of Tot 0109-383 is exposed to direct view, as indicated by optical and infrared properties. However, the X-ray absorption must occur at small radii in order to hide the central X-ray source but leave the optical high-ionization emission-line region unobscured. This may also be the case for objects such as the Seyfert 1 galaxy Mrk231.
Iwasawa, K., Matt, G., Fabian, A.c., Bianchi, S., Brandt, W.n., Guainazzi, M., et al. (2001). Nuclear obscuration in the high-ionization Seyfert 2 galaxy Tol 0109-383 RID B-4804-2010. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 326(1), 119-125 [10.1046/j.1365-8711.2001.04585.x].
Nuclear obscuration in the high-ionization Seyfert 2 galaxy Tol 0109-383 RID B-4804-2010
MATT, Giorgio;
2001-01-01
Abstract
We report on the BeppoSAX detection of a hard X-ray excess in the X-ray spectrum of the classical high-ionization Seyfert 2 galaxy Tot 0109-383. The X-ray emission of this source observed below 7 keV is dominated by reflection from both cold and ionized gas, as seen in the ASCA data. The excess hard X-ray emission is presumably caused by the central source absorbed by an optically thick obscuring torus with N-H similar to 2 x 10(24) cm(-2). The strong cold X-ray reflection, if it is produced at the inner surface of the torus, is consistent with the picture where much of the inner nucleus of Tot 0109-383 is exposed to direct view, as indicated by optical and infrared properties. However, the X-ray absorption must occur at small radii in order to hide the central X-ray source but leave the optical high-ionization emission-line region unobscured. This may also be the case for objects such as the Seyfert 1 galaxy Mrk231.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
