Xin-Ke Hu

Fast Optical Variability of the TeV Blazar PKS 1725+123 Observed by SVOM-VT and Insights from Multiwavelength Follow-up Observations

Shuo-Yu Liu, Yu-Wei Yu, Ji-Shun Lian, Xin-Ke Hu et autres

Abstract PKS 1725+123 is a flat-spectrum radio quasar (FSRQ) with a redshift of z = 0.586. The detection of this object in the TeV band was reported by the MAGIC telescopes and High Energy Stereoscopic System in 2025 August. Subsequently, we promptly …

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Fast Optical Variability of the TeV Blazar PKS 1725+123 Observed by SVOM-VT and Insights from Multi-wavelength Follow-up Observations

Liu S, Yu-Wei Yu, Ji-Shun Lian, Xin-Ke Hu et autres

PKS 1725+123 is a flat-spectrum radio quasar (FSRQ) with a redshift of $z=0.586$. The detection of this object in the TeV band was reported by the MAGIC telescopes and H.E.S.S. in August 2025. Subsequently, we promptly initiated Target-of-Opportunity observations using the Space-based …

Spectral Variations of γ -Rays in Mrk 421

Rui-Qi Huang, Xin-Ke Hu, Yu-Wei Yu, Ji-Shun Lian et autres

Abstract We present a comprehensive analysis of the 17 yr Fermi-LAT observational data of Mrk 421 to investigate the spectral variations in the γ -ray bands. The light curve of the source in the 0.1–1000 GeV band with a 14 day time …

cn (code pays fourni par la source)

Spectral Variations of $γ$-rays in Mrk 421

Rui-Qi Huang, Xin-Ke Hu, Yu-Wei Yu, Ji-Shun Lian et autres

We present a comprehensive analysis of the 17-year Fermi-LAT observational data of Mrk 421 to investigate the spectral variations in the $γ$-ray bands. The light curve of the source in the 0.1--1000 GeV band with a 14-day time bin exhibits significant variability …

Spectral Variations of $γ$-rays in Mrk 421

Rui-Qi Huang, Xin-Ke Hu, Yu-Wei Yu, Ji-Shun Lian et autres

We present a comprehensive analysis of the 17-year Fermi-LAT observational data of Mrk 421 to investigate the spectral variations in the $γ$-ray bands. The light curve of the source in the 0.1--1000 GeV band with a 14-day time bin exhibits significant variability …

cn (code pays fourni par la source)

X-Ray Polarization and Spectral Variations in an Extreme High-synchrotron-peaked Blazar 1ES 1101–232

Xin-Ke Hu, Jin Yu Zhang, Fei Xie, Xiang-Gao Wang

Abstract We present the first X-ray polarimetric observation of the extreme high-synchrotron-peaked blazar 1ES 1101–232, conducted by the Imaging X-ray Polarimetry Explorer (IXPE). The data analysis incorporates simultaneous and quasi-simultaneous observations from the Swift X-Ray Telescope and NuSTAR. Our results reveal a …

X-ray Polarization and Spectral Variations in an Extreme High-Synchrotron-Peaked Blazar 1ES 1101--232

Xin-Ke Hu, Jin Zhang, Fei Xie, Xiang-Gao Wang

We present the first X-ray polarimetric observation of the extreme high-synchrotron-peaked blazar 1ES 1101--232, conducted by the Imaging X-ray Polarimetry Explorer (IXPE). The data analysis incorporates simultaneous and quasi-simultaneous observations from Swift-XRT and NuSTAR. Our results reveal a significant detection of X-ray …

Two-component γ-Ray Emission Spectrum and X-Ray Polarization of the Radio Galaxy Pictor A

Jia-Xuan Li, Xin-Ke Hu, Ji-Shun Lian, Yu-Wei Yu et autres

Abstract Pictor A is a γ-ray emitting radio galaxy and has a bright hotspot called the western hotspot (WHS), located ∼4′ away from the nucleus. In this work, we present an analysis of its 16 yr Fermi Large Area Telescope (LAT) data …

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X-Ray Polarization of the High-synchrotron-peaked BL Lac H 1426+428

Xin-Ke Hu, Jia-Xuan Li, Yu-Wei Yu, Ji-Shun Lian et autres

Abstract We report the X-ray polarization properties of the high-synchrotron-peaked BL Lac H 1426+428, based on two-epoch observational data from the Imaging X-ray Polarimetry Explorer (IXPE). For the first observation, only an upper limit of polarization degree (ΠX), ΠX < 19.5%, at …

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X-ray Polarization of the High-Synchrotron-Peaked BL Lac H 1426+428

Xin-Ke Hu, Jia-Xuan Li, Yu-Wei Yu, Ji-Shun Lian et autres

We report the X-ray polarization properties of the high-synchrotron-peaked BL Lac H 1426+428, based on two-epoch observational data from the Imaging X-ray Polarimetry Explorer (IXPE). For the first observation, only an upper limit of polarization degree ($Π_{\rm X}$), $Π_{\rm X}<19.5\%$, at the …

gb (code pays fourni par la source)

Origin of the Very High Energy Gamma Rays in the Low-luminosity Active Galactic Nucleus NGC 4278

Ji-Shun Lian, Jia-Xuan Li, Xin-Ke Hu, Ying-Ying Gan et autres

Abstract NGC 4278, a low-luminosity active galactic nucleus, is generally classified as a low-ionization nuclear emission-line region (LINER). Recently, it has been reported to be associated with a very high energy γ -ray source 1LHAASO J1219+2915 in the first Large High Altitude …

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Two-Component gamma-ray Emission Spectrum and X-Ray Polarization of the Radio Galaxy Pictor A

Jia-Xuan Li, Xin-Ke Hu, Ji-Shun Lian, Yu-Wei Yu et autres

Pictor A is a $γ$-ray emitting radio galaxy and has a bright hotspot called WHS, located $\sim$4 arcmin away from the nucleus. In this work, we present an analysis of its 16-year Fermi-LAT data and report the Imaging X-ray Polarimetry Explorer (IXPE) …

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