Journal
ASTROPHYSICAL JOURNAL
Volume 865, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/aadd93
Keywords
methods: observational; pulsars: individual (J1154-6250); stars: neutron; X-rays: stars
Categories
Funding
- Israel science foundation (ISF) I-CORE [1829/12]
- RSF [14-12-00146]
- Ministry of Education and Science of the Russian Federation [14.W03.31.0021]
- NWO VIDI [A.2320.0076]
- ESA
- NASA
- Space Telescope Science Institute under U.S. Government [NAG W-2166]
- Russian Science Foundation [17-12-00014] Funding Source: Russian Science Foundation
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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.
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