Results 41 to 50 of about 108,919 (255)

Discovery of Delayed Spin-up Behavior Following Two Large Glitches in the Crab Pulsar, and the Statistics of Such Processes [PDF]

Astrophysical Journal, 2020
Glitches correspond to sudden jumps of rotation frequency (ν) and its derivative ( ) of pulsars, the origin of which remains not well understood yet, partly because the jump processes of most glitches are not well time-resolved.
M. Ge, S. Zhang, F. Lu, T. Li, J. Yuan, X. P. Zheng, Y. Huang, S. Zheng, Y. Chen, Z. Chang, Y. Tuo, Q. Cheng, C. Gungor, L. M. Song, Y. Xu, X. Cao, Y. Chen, C. Liu, S. Zhang, J. Qu, Q. Bu, C. Cai, G. Chen, L. Chen, M. Z. Chen, T. Chen, Y. Chen, W. Cui, W. Cui, J. Deng, Y. Dong, Y. Du, M. Fu, G. Gao, H. Gao, M. Gao, Y. Gu, J. Guan, C. Guo, D. Han, L. Hao, J. Huo, S. Jia, L. Jiang, W. Jiang, C. Jin, J. Jin, Y. Jin, L. Kong, B. Li, D. Li, C. K. Li, G. Li, M. Li, W. Li, X. Li, X. Li, X. Li, Y. Li, Z. Li, Z. Li, Z. Liu, X. Liang, J. Liao, G. Liu, H. Liu, X. Liu, Y. Liu, B. Lu, X. Lu, Q. Luo, T. Luo, X. Ma, B. Meng, Y. Nang, J. Nie, G. Ou, N. Sai, R. Shang, X. Song, L. Sun, Y. Tan, L. Tao, C. Wang, G. Wang, J. Wang, J. Wang, M. Wang, N. Wang, W. Wang, Y. Wang, Y. Wang, X. Wen, Z. Wen, B. Wu, B. Wu, M. Wu, G. Xiao, S. Xiao, S. Xiong, Y. Xu, W. M. Yan, J. Yang, S. Yang, Y. J. Yang, Q. Yi, Q. Yin, Y. You, Y. Yue, A. Zhang, C. Zhang, D. Zhang, F. Zhang, H. Zhang, J. Zhang, T. Zhang, W. Zhang, W. Zhang, W. Zhang, Y. Zhang, Y. Zhang, Y. Zhang, Z. Zhang, Z. Zhang, H. Zhao, X. Zhao, W. Zheng, D. Zhou, J. Zhou, X. Zhou, R. Zhuang, Y. Zhu, Y. Zhu, Key Laboratory of Particle Astrophysics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100049, China., D. O. Astronomy, Tsinghua University, Beijing 100084, U. O. A. Sciences, Xinjiang Astronomical Observatory, Xinjiang 830011, Center for Astronomical Mega-Science, Beijing, 100012, Institute of Theoretical Astrophysics, Central China Normal University, Hubei., S. O. Physics, Technology, Wuhan University, I. University, S. Faculty, S. Sciences, Beyazit, 34119, Istanbul, Turkey, Beijing Normal University, Beijing 100088, Yunnan Observatories, Kunming, National Astronomical Observatories, Chaoyang District, D. Physics, Key Laboratory of Optical Astronomy, Nanjing 210008, National University of Science, Changsha, D. Physics   +171 more
semanticscholar   +1 more source

A new approach to generate a catalogue of potential historical novae

Astronomische Nachrichten, Volume 341, Issue 1, Page 79-98, January 2020., 2020
Abstract Ancient Chinese, Korean, and Vietnamese observers left us records of celestial sightings, the so‐called “guest stars” dated up to ∼2500 years ago. Their identification with modern observable targets could open interesting insights into the long‐term behavior of astronomical objects, as shown by the successful identification of eight galactic ...
Susanne M. Hoffmann, Nikolaus Vogt, Philipp Protte   +2 more
wiley   +1 more source

High‐Altitude Emission from Pulsar Slot Gaps: The Crab Pulsar [PDF]

The Astrophysical Journal, 2008
We present results of a 3D model of optical to gamma-ray emission from the slot gap accelerator of a rotation-powered pulsar. Primary electrons accelerating to high-altitudes in the unscreened electric field of the slot gap reach radiation-reaction limited Lorentz factors of 2 x 10^7, while electron-positron pairs from lower-altitude cascades flow ...
Harding, Alice K., Stern, Julie V., Dyks, Jaroslaw, Frackowiak, Michal   +3 more
openaire   +2 more sources

Unpulsed Optical Emission from the Crab Pulsar [PDF]

The Astrophysical Journal, 2000
Abstract Using the high speed 2-d TRIFFID photometer, we have obtained phase resolved photometry of the Crab pulsar in UBV that allows us to flux the unpulsed light curve component. Following de-extinction, weighted least-square fitting indicates a power-law exponent of α = −0.62 ± 0.49. This is steeper than that reported for the peak components and
Golden, A., Shearer, A., Beskin, G. M.
openaire   +4 more sources

Inferring the origins of the pulsed γ-ray emission from the Crab pulsar with ten-year Fermi-LAT data [PDF]

Astronomy & Astrophysics, 2020
Context. The Crab pulsar is a bright γ-ray source, which has been detected at photon energies up to ∼1 TeV. Its phase-averaged and phase-resolved γ-ray spectra below 10 GeV exhibit exponential cutoffs, while those above 10 GeV apparently follow simple ...
P. Yeung
semanticscholar   +1 more source

The largest glitch observed in the Crab pulsar [PDF]

, 2018
We have observed a large glitch in the Crab pulsar (PSR B0531+21). The glitch occurred around MJD 58064 (2017 November 8) when the pulsar underwent an increase in the rotation rate of $\Delta \nu = 1.530 \times 10^{-5}$ Hz, corresponding to a fractional ...
B. Shaw, A. Lyne, Benjamin Stappers, P. Weltevrede, Cees Bassa, Amy Lien, Amy Lien, M. Mickaliger, R. Breton, C. Jordan, Michael J. Keith, H. Krimm, H. Krimm   +12 more
semanticscholar   +1 more source

Temporal variations in scattering and dispersion measure in the Crab Pulsar and their effect on timing precision [PDF]

Monthly notices of the Royal Astronomical Society, 2018
We have measured variations in scattering time scales in the Crab Pulsar over a 30-year period, using observations made at 610 MHz with the 42-ft telescope at Jodrell Bank Observatory.
J. Mckee, J. Mckee, A. Lyne, B. Stappers, C. Bassa, C. Jordan   +5 more
semanticscholar   +1 more source

Improved Measurements of the IXPE Crab Polarization

The Astrophysical Journal, 2023
X-ray polarization from the Imaging X-ray Polarimetry Explorer (IXPE) provides an important new probe of the geometry of the pulsar emission zone and of particle acceleration in the surrounding pulsar wind nebula.
Josephine Wong, Roger W. Romani, Jack T. Dinsmore   +2 more
doaj   +1 more source

Resolving the Crab pulsar wind nebula at teraelectronvolt energies [PDF]

Nature Astronomy, 2019
The Crab nebula is one of the most-studied cosmic particle accelerators, shining brightly across the entire electromagnetic spectrum up to very-high-energy gamma rays1,2.
H. Collaboration
semanticscholar   +1 more source

Insight-HXMT observations of the Crab pulsar [PDF]

Research in Astronomy and Astrophysics, 2019
We report on X-ray emission properties of the Crab pulsar (PSR B0531+21) using observations by insight-HXMT during its first year after launch. We obtained high signal-to-noise profiles in the X-ray energy band 11–250 keV.
Y. Tuo, M. Ge, Liming Song, Lin-Li Yan, Q. Bu, J. Qu   +5 more
semanticscholar   +1 more source