Discovery of a new X-ray pulsar GS 1843-02

Details Discovery of a new X-ray pulsar GS 1843-02 Discovery of a new X-ray pulsar GS 1843-02

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasj...42l..59k&link_type=abstract

Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 42, no. 4, 1990, p. L59-L64.

Astronomy and Astrophysics

Astronomy

11

Pulsars, X Ray Binaries, X Ray Spectra, Astronomical Models, B Stars, Energy Spectra, Light Curve, Stellar Mass

Scientific paper

A new X-ray pulsar was discovered with a 94.9-s pulse period in the Scutum region on the Galactic plane. The position of the new pulsar has been determined to be alpha (1950) = 18 h 43.9 min + or - 3.4 min, delta (1950) = -2.5 deg + or - 0.1 deg (named GS 1843-02). The pulse profile is roughly sinusoidal with a similar shape between different energy bands. The X-ray spectrum was fitted by a power-law model with an exponential cut-off: a conventional model for describing a typical binary X-ray pulsar. Evidence for a large hydrogen column density, N(H) of (1.5-3) x 10 to the 23rd H/sq cm was found in a low-energy band and near the iron K edge. The large N(H) value may indicate that the distance of GS 1843-02 is large; perhaps this pulsar lies in the 5-kpc Galactic arm.

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