The X-ray spectrum and variability of the Seyfert 2 galaxy NGC 7172
The X-ray spectrum and variability of the Seyfert 2 galaxy NGC 7172
We present evidence of flux variability, on both short (hours) and long (months) time-scales, of the Seyfert 2 galaxy NGC 7172. These results are based on the ASCA observation of NGC 7172 performed in 1996 May. The source was detected at a rather low flux level, about 3 times fainter …