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Astron. Astrophys. 339, L41-L44 (1998)

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Letter to the Editor

Discovery of a new 170 s X-ray pulsar 1SAX J1324.4-6200

L. Angelini * 1, M.J. Church 2, A.N. Parmar 3, M. Bauciska-Church 2 and T. Mineo 4

1 Laboratory for High Energy Astrophysics, Code 660.2, NASA/Goddard Space Flight Center, MD 20771, USA
2 School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK
3 Astrophysics Division, Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
4 Instituto IFCAI, via La Malfa 153, I-90146 Palermo, Italy

Received 31 August 1998 / Accepted 25 September 1998


We report the discovery with BeppoSAX of a new [FORMULA] s X-ray pulsar, 1SAX J1324.4-6200, found serendipitously in the field of the X-ray binary XB 1323-619 in 1997 August. The source and periodicity are also detected in archival ASCA data taken in 1994. The X-ray spectrum is modeled by a power-law with a photon index of [FORMULA] and absorption of [FORMULA] atom cm-2. The source is located close to the galactic plane and within [FORMULA] of the direction of the dark cloud DC 306.8+0.6. The measured interstellar absorption and cloud size imply a distance [FORMULA]3.4 kpc. This implies a 1-10 keV source luminosity of [FORMULA][FORMULA] erg s-1 during the BeppoSAX observation. The source is not detected in earlier Einstein IPC and EXOSAT CMA observations, most probably due to reduced detector efficency and lower sensitivity to highly absorbed sources. The X-ray properties suggest that 1SAX J1324.4-6200 is an accreting neutron star with a Be star companion.

Key words: X-ray: stars – stars: rotation – pulsar: general – stars: individual: 1SAX J1324.4-6200

* Universities Space Research Association

Send offprint requests to: L. Angelini

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© European Southern Observatory (ESO) 1998

Online publication: October 21, 1998