Suzaku x-ray follow-up observations of seven unassociated fermi-lat gamma-ray sources at high galactic latitudes

Y. Takahashi, J. Kataoka, T. Nakamori, K. Maeda, R. Makiya, T. Totani, C. C. Cheung, L. Stawarz, L. Guillemot, P. C.C. Freire, I. Cognard

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

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 20-40ks 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 1FGLJ2302.8+4443. The X-ray spectrum of the detected counterpart was well fit by a blackbody model with temperature of kT ≃ 0.3keV, 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 (1FGLJ0106.7+4853) and MSPs (1FGLJ1312.6+0048, J1902.0-5110, and J2043.2+1709), only upper limits in the 0.5-10keV band were obtained at the flux levels of ≃ 10-14ergcm-2s-1. A weak X-ray source was found in the field of 1FGLJ1739.4+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 1FGLJ1743.8-7620 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.

Original languageEnglish
Article number64
JournalAstrophysical Journal
Volume747
Issue number1
DOIs
Publication statusPublished - 2012 Mar 1

Keywords

  • X-rays: general
  • galaxies: active
  • gamma rays: general
  • pulsars: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Suzaku x-ray follow-up observations of seven unassociated fermi-lat gamma-ray sources at high galactic latitudes'. Together they form a unique fingerprint.

Cite this