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Astron. Astrophys. 359, 509-513 (2000)

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BeppoSAX discovery of a new Seyfert 2 galaxy: 1SAXJ2234.8-2541 *

A. Malizia 1,2, L. Bassani 3 and I. Negueruela 1

1 BeppoSAX Science Data Center, ASI, Via Corcolle, 19, 00131 Roma, Italy
2 Department of Physics and Astronomy, Southampton University Southampton, SO17 1BJ, UK
3 Istituto TESRE, CNR, Via Gobetti, 101, 40129 Bologna, Italy

Received 7 April 2000 / Accepted 16 May 2000

Abstract

In the present work we report the BeppoSAX serendipitous discovery of the type 2 AGN 1SAXJ2234.8-2541 in the MECS field of view when pointing at the Seyfert 2 galaxy NGC7314. The source is optical identified with the bright (mB=14.40) galaxy ESO533-G50 at redshift z=0.026. The source is clearly detected at energies above 4 keV but barely visible below this energy implying heavy obscuration intrinsic to the source. Spectral analysis indicates a column density of the order of 2-3 [FORMULA] 1023 cm-2 and a power law photon index compatible with values often seen in active galaxies. These X-ray characteristics suggest a Seyfert 2 classification for 1SAXJ2234.8-2541. Subsequent spectroscopy of the optical counterpart, ESO533-G50, performed with the ESO 1.52m telescope at La Silla Observatory, confirms the type 2 nature of this source and therefore its identification with the X-ray source. We also report the marginal detection of an iron line centered at 7.29 [FORMULA] 0.47 keV and having an equivalent width of [FORMULA] eV; although marginal, this result is indicative of the presence of warm material in the source. If instead the line is associated to cold material, we estimate an upper limit to its equivalent width of 290 eV. The overall characteristics of 1SAXJ2234.8-2541 strongly suggest that the source is Compton thin.

Key words: galaxies: individual: 1SAXJ2234.8-2541 – galaxies: Seyfert – X-rays: galaxies

* Partially based on observations collected at the European Southern Observatory, Chile

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© European Southern Observatory (ESO) 2000

Online publication: July 7, 2000
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