Discovery of the Faint X-Ray Pulsar AX J1820.5-1434 with ASCA

Details Discovery of the Faint X-Ray Pulsar AX J1820.5-1434 with ASCA Discovery of the Faint X-Ray Pulsar AX J1820.5-1434 with ASCA

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...495..435k&link_type=abstract

Astrophysical Journal v.495, p.435

Astronomy and Astrophysics

Astronomy

28

Stars: Pulsars: General, Stars: Pulsars: Individual Alphanumeric: Ax J1820.5-, 434, Stars: Binaries: General, X-Rays: Stars

Scientific paper

A new X-ray pulsar, AX J1820.5-1434, has been discovered during the ASCA Galactic plane survey project on April 9, at R.A. = 18h20m29.s5, decl. = -14 deg34'24" (equinox 2000.0; error radius 0.'5). A coherent pulsation was detected from the source with an apparent barycentric pulse period of 152.26 +/- 0.04 s. The mean flux, not corrected for the interstellar absorption, was 2.3 x 10-11 ergs s-1 cm-2 in the 2-10 keV energy band. The energy spectra obtained by the GIS and SIS can be fitted by a power-law model (photon index = 0.9 +/- 0.2) with a large column density of 9.8 +/- 1.7 x 1022 H atoms cm-2. These parameters indicate that the new pulsar is a highly obscured accretion-driven binary X-ray pulsar. This discovery of a faint pulsar suggests existence of many hidden pulsars in our Galaxy.

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