Toward identifying the unassociated gamma-ray source 1fgl j1311.7-3429 with x-ray and optical observations

Jun Kataoka, Y. Yatsu, N. Kawai, Y. Urata, C. C. Cheung, Y. Takahashi, Keiichi Maeda, T. Totani, R. Makiya, H. Hanayama, T. Miyaji, A. Tsai

    Research output: Contribution to journalArticle

    23 Citations (Scopus)

    Abstract

    We present deep optical and X-ray follow-up observations of the bright unassociated Fermi-LAT gamma-ray source 1FGL J1311.7-3429. The source was already known as an unidentified EGRET source (3EG J1314-3431, EGR J1314-3417), hence its nature has remained uncertain for the past two decades. For the putative counterpart, we detected a quasi-sinusoidal optical modulation of Δm ∼ 2mag with a period of ≃1.5 hr in the Rc, r′, and g′ bands. Moreover, we found that the amplitude of the modulation and peak intensity changed by ≳1mag and ∼ 0.5mag, respectively, over our total six nights of observations from 2012 March to May. Combined with Swift UVOT data, the optical-UV spectrum is consistent with a blackbody temperature, kT≃ 1eV and the emission volume radius R bb ≃ 1.5 × 104 d kpc km (d kpc is the distance to the source in units of 1kpc). In contrast, deep Suzaku observations conducted in 2009 and 2011 revealed strong X-ray flares with a light curve characterized with a power spectrum density of P(f) f -2.0 ± 0.4, but the folded X-ray light curves suggest an orbital modulation also in X-rays. Together with the non-detection of a radio counterpart, and significant curved spectrum and non-detection of variability in gamma-rays, the source may be the second "radio-quiet" gamma-ray emitting millisecond pulsar candidate after 1FGL J2339.7-0531, although the origin of flaring X-ray and optical variability remains an open question.

    Original languageEnglish
    Article number176
    JournalAstrophysical Journal
    Volume757
    Issue number2
    DOIs
    Publication statusPublished - 2012 Oct 1

    Fingerprint

    x rays
    light curve
    gamma rays
    radio
    modulation
    light modulation
    night
    pulsars
    flares
    power spectra
    orbitals
    radii
    temperature
    flaring

    Keywords

    • gamma rays: stars
    • pulsars: general
    • X-rays: general

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Toward identifying the unassociated gamma-ray source 1fgl j1311.7-3429 with x-ray and optical observations. / Kataoka, Jun; Yatsu, Y.; Kawai, N.; Urata, Y.; Cheung, C. C.; Takahashi, Y.; Maeda, Keiichi; Totani, T.; Makiya, R.; Hanayama, H.; Miyaji, T.; Tsai, A.

    In: Astrophysical Journal, Vol. 757, No. 2, 176, 01.10.2012.

    Research output: Contribution to journalArticle

    Kataoka, J, Yatsu, Y, Kawai, N, Urata, Y, Cheung, CC, Takahashi, Y, Maeda, K, Totani, T, Makiya, R, Hanayama, H, Miyaji, T & Tsai, A 2012, 'Toward identifying the unassociated gamma-ray source 1fgl j1311.7-3429 with x-ray and optical observations', Astrophysical Journal, vol. 757, no. 2, 176. https://doi.org/10.1088/0004-637X/757/2/176
    Kataoka, Jun ; Yatsu, Y. ; Kawai, N. ; Urata, Y. ; Cheung, C. C. ; Takahashi, Y. ; Maeda, Keiichi ; Totani, T. ; Makiya, R. ; Hanayama, H. ; Miyaji, T. ; Tsai, A. / Toward identifying the unassociated gamma-ray source 1fgl j1311.7-3429 with x-ray and optical observations. In: Astrophysical Journal. 2012 ; Vol. 757, No. 2.
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    AU - Yatsu, Y.

    AU - Kawai, N.

    AU - Urata, Y.

    AU - Cheung, C. C.

    AU - Takahashi, Y.

    AU - Maeda, Keiichi

    AU - Totani, T.

    AU - Makiya, R.

    AU - Hanayama, H.

    AU - Miyaji, T.

    AU - Tsai, A.

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    N2 - We present deep optical and X-ray follow-up observations of the bright unassociated Fermi-LAT gamma-ray source 1FGL J1311.7-3429. The source was already known as an unidentified EGRET source (3EG J1314-3431, EGR J1314-3417), hence its nature has remained uncertain for the past two decades. For the putative counterpart, we detected a quasi-sinusoidal optical modulation of Δm ∼ 2mag with a period of ≃1.5 hr in the Rc, r′, and g′ bands. Moreover, we found that the amplitude of the modulation and peak intensity changed by ≳1mag and ∼ 0.5mag, respectively, over our total six nights of observations from 2012 March to May. Combined with Swift UVOT data, the optical-UV spectrum is consistent with a blackbody temperature, kT≃ 1eV and the emission volume radius R bb ≃ 1.5 × 104 d kpc km (d kpc is the distance to the source in units of 1kpc). In contrast, deep Suzaku observations conducted in 2009 and 2011 revealed strong X-ray flares with a light curve characterized with a power spectrum density of P(f) f -2.0 ± 0.4, but the folded X-ray light curves suggest an orbital modulation also in X-rays. Together with the non-detection of a radio counterpart, and significant curved spectrum and non-detection of variability in gamma-rays, the source may be the second "radio-quiet" gamma-ray emitting millisecond pulsar candidate after 1FGL J2339.7-0531, although the origin of flaring X-ray and optical variability remains an open question.

    AB - We present deep optical and X-ray follow-up observations of the bright unassociated Fermi-LAT gamma-ray source 1FGL J1311.7-3429. The source was already known as an unidentified EGRET source (3EG J1314-3431, EGR J1314-3417), hence its nature has remained uncertain for the past two decades. For the putative counterpart, we detected a quasi-sinusoidal optical modulation of Δm ∼ 2mag with a period of ≃1.5 hr in the Rc, r′, and g′ bands. Moreover, we found that the amplitude of the modulation and peak intensity changed by ≳1mag and ∼ 0.5mag, respectively, over our total six nights of observations from 2012 March to May. Combined with Swift UVOT data, the optical-UV spectrum is consistent with a blackbody temperature, kT≃ 1eV and the emission volume radius R bb ≃ 1.5 × 104 d kpc km (d kpc is the distance to the source in units of 1kpc). In contrast, deep Suzaku observations conducted in 2009 and 2011 revealed strong X-ray flares with a light curve characterized with a power spectrum density of P(f) f -2.0 ± 0.4, but the folded X-ray light curves suggest an orbital modulation also in X-rays. Together with the non-detection of a radio counterpart, and significant curved spectrum and non-detection of variability in gamma-rays, the source may be the second "radio-quiet" gamma-ray emitting millisecond pulsar candidate after 1FGL J2339.7-0531, although the origin of flaring X-ray and optical variability remains an open question.

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