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

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/100865

Title:	Toward identifying the unassociated gamma-ray source 1fgl j1311.7-3429 with x-ray and optical observations
Authors:	浦田裕次;Kataoka, J.;Yatsu, Y.;Kawai, N.;Urata, Y.;Cheung, C. C.;Takahashi, Y.;Maeda, K.;Totani, T.;Makiya, R.;Hanayama, H.;Miyaji, T.;Tsai, A.
Contributors:	理學院天文研究所
Keywords:	AMPLITUDES;ASTROPHYSICS;ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;Asymptotic properties;COSMIC GAMMA SOURCES;Density;DISTANCE;Flares;GAMMA ASTRONOMY;GAMMA RADIATION;Gamma rays;Light curve;MODULATION;Orbitals;PULSARS;STARS;STELLAR FLARES;ULTRAVIOLET SPECTRA;VISIBLE RADIATION;X RADIATION;X-rays
Date:	2012-10-01
Issue Date:	2026-04-21 14:16:36 (UTC+8)
Publisher:	IOP Publishing Ltd.;United States
Abstract:	摘要： 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 [Delta]m ~ 2 mag with a period of [Asymptotically = to]1.5 hr in the Rc, r', and g' bands. Moreover, we found that the amplitude of the modulation and peak intensity changed by [gap]1 mag and ~0.5 mag, 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 [Asymptotically = to] 1 eV and the emission volume radius R sub(bb) [Asymptotically = to] 1.5 x 10 super(4) d sub(kpc) is the distance to the source in units of 1 kpc). 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) [is proportional to] f super(-2.0 + or - 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. 出版者： United States 出版日期： 2012-10-01 出處： The Astrophysical journal, 2012-10, Vol.757 (2), p.176-9 資源來源： Institute of Physics Journals 識別號： ISSN: 0004-637X 識別號： EISSN: 1538-4357 識別號： DOI: 10.1088/0004-637X/757/2/176
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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