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Astron. Astrophys. 360, 107-110 (2000)

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

G.C. Dewangan 1, K.P. Singh 1, P. Szkody *  2 and D.W. Hoard[FORMULA]  3

1 Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Mumbai, 400 005, India
2 Department of Astronomy, University of Washington, Seattle, WA 98195, USA
3 Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile

Received 25 April 2000 / Accepted 30 May 2000


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 [FORMULA] within [FORMULA]. The ROSAT PSPC spectrum of RX J1236.9+2656 is well represented by a power-law of [FORMULA] absorbed by matter in our own Galaxy ([FORMULA]). Intrinsic soft X-ray luminosity of the NLS1 galaxy is estimated to be [FORMULA] in the energy band of [FORMULA]. The optical spectrum of RX J1236.9+2656 is typical of NLS1 galaxies and shows narrow Balmer emission lines ([FORMULA] FWHM [FORMULA]) of H[FORMULA], H[FORMULA], and forbidden lines of [O III] and [N II]. Fe II multiplets, usually present in optical spectra of NLS1 galaxies, are also detected in RX J1236.9+2656.

Key words: galaxies: active – galaxies: individual: RX J1236.9+2656 – galaxies: nuclei – X-rays: galaxies

* Based on observations with the Apache Point Observatory (APO) 3.5m telescope, which is owned and operated by the Astrophysical Research Consortium (ARC).

© European Southern Observatory (ESO) 2000

Online publication: July 27, 2000