Open AccessThe discovery of 12‐min X‐ray pulsations from 1WGA J1958.2+3232
Author(s) -
Israel G. L.,
Angelini L.,
Campana S.,
Giommi P.,
Stella L.,
White N. E.
Publication year - 1998
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1998.01653.x
Subject(s) - physics , rosat , pulsar , astrophysics , luminosity , flux (metallurgy) , amplitude , x ray , light curve , galactic plane , proportional counter , astronomy , power law , photon , galaxy , optics , detector , statistics , materials science , mathematics , metallurgy
During a systematic search for periodic signals in a sample of ROSAT PSPC (0.1–2.4 keV) light curves, we have discovered ∼12‐min large‐amplitude X‐ray pulsations in 1WGA J1958.2+3232, an X‐ray source which lies close to the Galactic plane. The energy spectrum is well fitted by a power law with a photon index of 0.8, corresponding to an X‐ray flux level of ∼ 10 −12 erg cm −2 s −1 . The source is probably a long‐period, low‐luminosity X‐ray pulsar, similar to X Per, or an intermediate polar.