XMM-NEWTON Observation of the Seyfert 2 Galaxy NGC 4138
L. Foschini, F. Panessa, A. L. Longinotti, L. C. Ho, L. Bassani, M. Cappi, M. Dadina, G. Malaguti, G. Di Cocco, F. Gianotti, J. B. Stephen, M. Trifoglio
Abstract
The XMM-Newton data presented here are the first X-ray observation of the Seyfert 2 galaxy NGC4138. Although the galaxy has been pointed by ROSAT-HRI, it was not detected, with a flux upper limit of about 1.1x10-13 erg cm-2 s-1 in the 0.2-2.4 keV energy band. XMM-Newton performed the observation on 26 November 2001. The source is detected for the first time in X-rays with F[0.2-2.4]=1.0x10-13 erg cm-2 s-1, in agreement with the upper limit of ROSAT. The source spectrum is typical of Seyfert 2 galaxies. We find heavy obscuration (NH about 8x1022 cm-2) and a flat photon index (1.6). The source intrinsic luminosity is about 5x1041 erg/s in the 0.5-10 keV energy band.
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