Discovery of X-Rays from the Old and Faint Pulsar J1154-6250
Popov SB; Elfritz JG; Mushtukov AA; Mereghetti S; Rigoselli M; Igoshev AP; Tsygankov SS
Discovery of X-Rays from the Old and Faint Pulsar J1154-6250
Popov SB
Elfritz JG
Mushtukov AA
Mereghetti S
Rigoselli M
Igoshev AP
Tsygankov SS
IOP PUBLISHING LTD
Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021042719882
https://urn.fi/URN:NBN:fi-fe2021042719882
Tiivistelmä
We report on the first X-ray observation of the 0.28 s isolated radio pulsar PSR J1154-6250 obtained with the XMM-Newton observatory in 2018 February. A point-like source is firmly detected at a position consistent with that of PSR J1154-6250. The two closest stars are outside the 3 sigma confidence limits of the source position and thus unlikely to be responsible for the observed X-ray emission. The energy spectrum of the source can be fitted equally well either with an absorbed power law with a steep photon index Gamma approximate to 3.3 or with an absorbed blackbody with temperature kT = 0.21 +/- 0.04 keV and emitting radius R-BB approximate to 80 m (assuming a distance of 1.36 kpc). The X-ray luminosity of 4.4 x 10(30) erg s(-1) derived with the power-law fit corresponds to an efficiency of eta(X) = L-X(unabs) /(E) over dot= 4.5 x 10(-3), similar to those of other old pulsars. The X-ray properties of PSR J1154-6250 are consistent with an old age and suggest that the spatial coincidence of this pulsar with the OB association Cm OB1 is due to a chance alignment.
Kokoelmat
- Rinnakkaistallenteet [19207]