Discovery of X-Rays from the Old and Faint Pulsar J1154-6250

Journal
Date Issued
2018
Author(s)
Igoshev, Andrei P.
•
Tsygankov, Sergey S.
•
•
•
Popov, Sergei B.
•
Elfritz, Justin G.
•
Mushtukov, Alexander A.
DOI
Abstract
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 3σ 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 Γ ≈ 3.3 or with an absorbed blackbody with temperature kT = 0.21 ± 0.04 keV and emitting radius R BB ≈ 80 m (assuming a distance of 1.36 kpc). The X-ray luminosity of 4.4 × 1030 erg s-1 derived with the power-law fit corresponds to an efficiency of {η }X={L}Xunabs}/\dot{E}=4.5× {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 Cru OB1 is due to a chance alignment.
Volume
865
Issue
2
Start page
116
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2018ApJ...865..116I
Rights
open.access
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