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

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  <sup>3

1</sup> 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

Abstract

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 within . The ROSAT PSPC spectrum of RX J1236.9+2656 is well represented by a power-law of absorbed by matter in our own Galaxy (). Intrinsic soft X-ray luminosity of the NLS1 galaxy is estimated to be in the energy band of . The optical spectrum of RX J1236.9+2656 is typical of NLS1 galaxies and shows narrow Balmer emission lines ( FWHM ) of H, H, 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).

SIMBAD Objects

Contents

• 1. Introduction
• 2. X-ray observation, analysis and results
• 3. Optical spectroscopy
• 4. Discussion
• 5. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 2000

Online publication: July 27, 2000
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