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

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

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    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

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    telescopes
    x rays
    pulsars
    rays
    general property
    blazars
    imaging spectrometers
    ellipse
    ellipses
    point sources
    neutron stars
    catalogs
    point source
    confidence
    observatories
    emitters
    spectrometer
    observatory
    photons
    temperature

    Keywords

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

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Suzaku x-ray follow-up observations of seven unassociated fermi-lat gamma-ray sources at high galactic latitudes. / Takahashi, Y.; Kataoka, Jun; Nakamori, T.; Maeda, Keiichi; Makiya, R.; Totani, T.; Cheung, C. C.; Stawarz, L.; Guillemot, L.; Freire, P. C C; Cognard, I.

    In: Astrophysical Journal, Vol. 747, No. 1, 64, 01.03.2012.

    Research output: Contribution to journalArticle

    Takahashi, Y, Kataoka, J, Nakamori, T, Maeda, K, Makiya, R, Totani, T, Cheung, CC, Stawarz, L, Guillemot, L, Freire, PCC & Cognard, I 2012, 'Suzaku x-ray follow-up observations of seven unassociated fermi-lat gamma-ray sources at high galactic latitudes', Astrophysical Journal, vol. 747, no. 1, 64. https://doi.org/10.1088/0004-637X/747/1/64
    Takahashi, Y. ; Kataoka, Jun ; Nakamori, T. ; Maeda, Keiichi ; Makiya, R. ; Totani, T. ; Cheung, C. C. ; Stawarz, L. ; Guillemot, L. ; Freire, P. C C ; Cognard, I. / Suzaku x-ray follow-up observations of seven unassociated fermi-lat gamma-ray sources at high galactic latitudes. In: Astrophysical Journal. 2012 ; Vol. 747, No. 1.
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    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.",
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    AU - Nakamori, T.

    AU - Maeda, Keiichi

    AU - Makiya, R.

    AU - Totani, T.

    AU - Cheung, C. C.

    AU - Stawarz, L.

    AU - Guillemot, L.

    AU - Freire, P. C C

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    N2 - 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.

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