A new narrow-line Seyfert 1 galaxy: RX J1236.9+2656

We report identification of a narrow-line Seyfert 1 galaxy RX J1236.9+2656. X-ray emission from the: NLS1 galaxy undergoes long-term variability with 0.1-2.0 keV flux changing by a factor of similar to 2 within similar to 3 y r. The ROSAT PSPC spectrum of RX J1236.9+2656 is well represented by a powe r-law of Gamma(X) = 3.7(-0.3)(+0.5) absorbed by matter in our own Galaxy (N -H = 1.33 x 10(20) cm(-2)). Intrinsic soft X-ray luminosity of the NLS1 gal axy is estimated to be similar to 1.5 x 10(43) erg s(-1) in the energy band of 0.1-2.0 keV. The optical spectrum of RX J1236.9+2656 is typical of NLS1 galaxies and shows narrow Palmer emission lines (1100 km s(-1) < EWHM: < 1 700 km s(-1)) of H beta, H alpha, and forbidden lines of [O III] and [N II] . Fe II multiplets, usually present in optical spectra of NLS1 galaxies, ar e also detected in RX J1236.9+2656.