88 citations · 583 across the 24 of their papers we have counts for
24 papers
A Possible Optical Quasi-periodic Oscillation of 134~day in the Radio-loud Narrow-line Seyfert 1 Galaxy TXS 1206+549 at
Chongyang Ren, Sisi Sun, Pengfei Zhang
Here we report an optical quasi-periodic oscillation (QPO) with a period of 134~day detected in g- and r-band light curves of a narrow-line Seyfert 1 galaxy TXS 1206+549 at r…
Discovery of an Extended -ray Emission around the Supernova Remnant Candidate associated with PSR J08372454
Pengfei Zhang, Yuliang Xin
Motivated by the recent discovery of a low surface brightness diffuse emission, a supernova remnant (SNR) candidate, surrounding the young pulsar PSR~J0837--2454, we carry out a li…
Likely detection of gamma-ray pulsations of PSR~J1717+4308A in NGC~6341 and implication of the gamma-ray millisecond pulsars in globular clusters
P. Zhang, Y. Xing, Z. Wang +2
We report our analysis results for the globular cluster (GC) NGC~6341 (M92), as a millisecond pulsar (MSP) J17174308A has recently been reported found in this GC. The data used…
Polarized Optical Emission of the Blazar PKS 1222+216: Discovery of A 420-day Quasi-Periodic Signal
Pengfei Zhang, Zhongxiang Wang
We report our search for quasi-periodic signals in long-term optical and -ray data for the blazar PKS~1222+216, where the data are from the Steward Observatory blazar monitoring…
Discovery of gamma-ray pulsations of PSR J18353259B in the Globular Cluster NGC 6652
Pengfei Zhang, Yi Xing, Zhongxiang Wang
Motivated by the newly discovery of a spin period 1.83\,ms pulsar J18353259B in the globular cluster (GC) NGC~6652, we analyze the gamma-ray data obtained with the Large Area Te…
A double-period oscillation signal in millimeter emission of the radio galaxy NGC 1275
Pengfei Zhang, Zhongxiang Wang, Mark Gurwell +1
The nearby Seyfert type galaxy NGC 1275 contains a bright radio nucleus at its center, revealed through high-spatial resolution imaging to be the source of the jets emanating from…
Gamma-ray spectral properties of the Galactic globular clusters: constraint on the numbers of millisecond pulsars
Wei Wu, Zhongxiang Wang, Yi Xing +1
We study the gamma-ray spectra of 30 globular clusters (GCs) thus far detected with the Fermi Gamma-ray Space Telescope. Presuming that gamma-ray emission of a GC comes from millis…
A Quasi-periodic Oscillation in the gamma-ray Emission from the Non-blazar Active Galactic Nucleus PKS 0521-36
Haiyun Zhang, Dahai Yan, Pengfei Zhang +2
Long-term gamma-ray variability of a non-blazar Active Galactic Nucleus (AGN) PKS 0521-36 is investigated by using Fermi-LAT pass 8 data covering from 2008 August to 2021 March. Th…
A Radio Quasi-periodic Oscillation of 176 day in the Radio-loud Narrow-line Seyfert 1 Galaxy J0849+5108
Pengfei Zhang, Zhongxiang Wang
We analyze the 11-year long-term light curve of the Radio-loud Narrow-line Seyfert 1 (NLSy1) galaxy J0849+5108 and the nearly simultaneous -ray data of the source. The data were…
Gaussian Process Modeling -LAT -ray Blazar Variability: A Sample of Blazars with -ray Quasi-periodicities
Shenbang Yang, Dahai Yan, Pengfei Zhang +2
Blazar variability may be driven by stochastic processes. On the other hand, quasi-periodic oscillation (QPO) behaviors are recently reported to be detected in -LAT dat…
Searching for Quasi-Periodic Modulations in -ray Active Galactic Nuclei
Pengfei Zhang, Dahai Yan, Jianeng Zhou +2
We perform a systematic search of quasi-periodic variabilities in -ray active galactic nuclei (AGNs) in the third \emph{Fermi} Large Area Telescope source catalog (3FGL). We emp…
Statistical analysis on X-ray flares from the nucleus and HST-1 knot in the M87 jet
Shenbang Yang, Dahai Yan, Benzhong Dai +4
The statistical properties of X-ray flares from two separate locations (nucleus and HST-1) in the M87 jet are investigated to reveal the physical origin of the flares. We analyse t…
Detection of Gamma-Rays from the Protostellar Jet in the HH 80-81 System
Dahai Yan, Jianeng Zhou, Pengfei Zhang
Considering that the existence of relativistic particles in the protostellar jet has been confirmed by the detection of linearly polarized radio emission from the HH 80-81 jet, we…
A 34.5 day quasi-periodic oscillation in gamma-ray emission from the blazar PKS 2247-131
Jianeng Zhou, Zhongxiang Wang, Liang Chen +5
Since 2016 October, the active galaxy PKS 2247-131 has undergone a gamma-ray outburst, which we studied using data obtained with the Fermi Gamma-ray Space Telescope. The emission a…
Impact of Plasma Instability on Constraint of the Intergalactic Magnetic Field
Dahai Yan, Jianeng Zhou, Pengfei Zhang +2
A relativistic electron-positron pair beam can be produced in the interaction of TeV photons from a blazar with the extragalactic background light (EBL). The relativistic …
A gamma-ray periodic modulation in Globular Cluster 47 Tucanae
Peng-Fei Zhang, Jia-Neng Zhou, Da-Hai Yan +4
The Globular Cluster 47 Tucanae was firstly detected in gamma-rays by the Large Area Telescope (LAT) onboard the \emph{Fermi} Gamma-ray Space Telescope, and the gamma-ray emission…
Statistical analysis on XMM-Newton X-ray flares of Mrk 421: distributions of peak flux and flaring time duration
Dahai Yan, Shenbang Yang, Pengfei Zhang +3
The energy dissipation mechanism in blazar jet is unknown. Blazar's flares could provide insights on this problem. Here we report statistical results of XMM-Newton X-ray flares of…
Testing relativistic boost as the cause of gamma-ray quasi-periodic oscillation in a blazar
Dahai Yan, Jianeng Zhou, Pengfei Zhang +2
The mechanism for producing gamma-ray quasi-periodic oscillation (QPO) in blazar is unknown. One possibility is the geometric model, in which without the need for intrinsic quasi-p…
A -ray Quasi-Periodic modulation in the Blazar PKS 0301243?
Peng-Fei Zhang, Da-Hai Yan, Jia-Neng Zhou +3
We report a nominally high-confidence -ray quasi-periodic modulation in the blazar PKS 0301243. For this target, we analyze its \emph{Fermi}-LAT Pass 8 data covering from 200…
Two transient X-ray Quasi-Periodic Oscillations separated by an intermediate state in 1H 0707-495
Peng-Fei Zhang, Peng Zhang, Neng-Hui Liao +3
In the narrow-line Seyfert 1 galaxy 1H 0707-495, recently a transient quasi-periodic oscillation (QPO) signal with a frequency of Hz has been detected at a…
Possible Quasi-Periodic modulation in the z = 1.1 -ray blazar PKS 0426-380
Pengfei Zhang, Dahai Yan, Nenghui Liao +3
We search for -ray and optical periodic modulations in a distant flat spectrum radio quasar (FSRQ) PKS 0426-380 (the redshift ). Using two techniques (i.e., the maximum l…
Revisiting Quasi-Periodic modulation in -ray Blazar PKS 2155-304 with Fermi Pass 8 data
Pengfei Zhang, Dahai Yan, Nenghui Liao +1
We examine the gamma-ray quasi-periodic variability of PKS 2155-304 with the latest publicly available \emph{Fermi}-LAT Pass 8 data which covers the years from 2008 August to 2016…
Testing one-zone synchrotron-self-Compton models with spectral energy distributions of Mrk 421
Qianqian Zhu, Dahai Yan, Pengfei Zhang +3
We test one-zone synchrotron self-Compton (SSC) models with high-quality multiwavelength spectral energy distribution (SED) data of Mrk 421. We use Markov chain Monte Carlo (MCMC)…
Discovery of gamma-ray emission from a strongly lobe-dominated quasar 3C 275.1
Neng-Hui Liao, Yu-Liang Xin, Shang Li +7
We systematically analyze the 6-year {\it Fermi}/LAT data of the lobe-dominated quasars (LDQs) in the complete LDQ sample from 3CRR survey and report the discovery of high-energy $…