Astrophys. J., 747, 64 (2012/March-1)
Suzaku X-ray follow-up observations of seven unassociated Fermi-LAT gamma-ray sources at high galactic latitudes.
TAKAHASHI Y., KATAOKA J., NAKAMORI T., MAEDA K., MAKIYA R., TOTANI T., CHEUNG C.C., STAWARZ L., GUILLEMOT L., FREIRE P.C.C. and COGNARD I.
Abstract (from CDS):
We report on our second-year campaign of X-ray follow-up observations of unidentified Fermi Large Area Telescope (LAT) γ-ray sources at high Galactic latitudes (|b| > 10°) using the X-ray Imaging Spectrometer on board the Suzaku X-ray Observatory. In this second year of the project, seven new targets were selected from the First Fermi-LAT Catalog, and studied with 20-40 ks effective Suzaku exposures. We detected an X-ray point source coincident with the position of the recently discovered millisecond pulsar (MSP) PSR J2302+4442 within the 95% confidence error circle of 1FGL J2302.8+4443. The X-ray spectrum of the detected counterpart was well fit by a blackbody model with temperature of kT ≃ 0.3 keV, consistent with an origin of the observed X-ray photons from the surface of a rotating magnetized neutron star. For four other targets that were also recently identified with a normal pulsar (1FGL J0106.7+4853) and MSPs (1FGL J1312.6+0048, J1902.0-5110, and J2043.2+1709), only upper limits in the 0.5-10 keV band were obtained at the flux levels of ≃ 10–14 erg/cm2/s. A weak X-ray source was found in the field of 1FGL J1739.4+8717, but its association with the variable γ-ray emitter could not be confirmed with the available Suzaku data alone. For the remaining Fermi-LAT object 1FGL J1743.8-7620 no X-ray source was detected within the LAT 95% error ellipse. We briefly discuss the general properties of the observed high Galactic-latitude Fermi-LAT objects by comparing their multiwavelength properties with those of known blazars and MSPs.
galaxies: active - gamma rays: general - pulsars: general - pulsars: individual: PSR J2302+4442 - X-rays: general
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