Results 11 to 20 of about 428,338 (258)
A Geometric Model to Interpret the γ-Ray Quasiperiodic Oscillation of PG 1553+113
The Astrophysical Journal, 2023 We propose a jet helical motion model to explain the γ -ray quasiperiodic oscillation of PG 1553+113. In this model, we hypothesize that a relativistic jet with constant angular velocity rotates around the axis, causing the Doppler factor of the jet to ...
Quan-Gui Gao +6 more
doaj +1 more source
Runaway massive stars as variable gamma-ray sources [PDF]
, 2014 Runaway stars are ejected from their formation sites well within molecular cores in giant dark clouds. Eventually, these stars can travel through the molecular clouds, which are highly inhomogeneous.
del Valle, Maria V., Romero, Gustavo E.
core +3 more sources
The Astrophysical Journal, 2023 Cosmology models predict that external accretion shocks form in the outer region of galaxy clusters owing to supersonic gas infall from filaments and voids in the cosmic web. They are characterized by high sonic and Alfvénic Mach numbers, M _s ∼ 10–10 ^2
Ji-Hoon Ha, Dongsu Ryu, Hyesung Kang
doaj +1 more source
Radio emission from the massive stars in the Galactic Super Star Cluster Westerlund 1 [PDF]
, 2009 Current mass-loss rate estimates imply that main sequence winds are not sufficient to strip away the H-rich envelope to yield Wolf-Rayet (WR) stars. The rich transitional population of Westerlund 1 (Wd 1) provides an ideal laboratory to observe mass-loss
Chapman, J. M. +4 more
core +3 more sources
The evolution of the large-scale emission in FRI jets
, 2010 Recent observations in X-rays and gamma-rays of nearby FRI radio galaxies have raised the question of the origin of the emission detected in the termination structures of their jets.
Abdo +43 more
core +1 more source
Radiative Processes In Extragalactic Large-Scale Jets [PDF]
, 2005 About one thousand extragalactic large-scale jets are known, and a few tens of them are confirmed sources of infrared, optical, or X-ray photons. Multiwavelength emission comming directly from these outflows is always non-thermal in origin.
Stawarz, L.
core +3 more sources
Identification of the infrared non-thermal emission in Blazars
, 2012 Blazars constitute the most interesting and enigmatic class of extragalactic gamma-ray sources dominated by non-thermal emission. In this Letter, we show how the WISE infrared data make possible to identify a distinct region of the [3.4]-[4.6]-[12 ...
Abdo +12 more
core +1 more source
Polarization Angle Orthogonal Jumps in Fast Radio Bursts
The Astrophysical JournalRecently, polarization angle (PA) orthogonal jumps over millisecond timescales were discovered from three bursts of the repeating fast radio burst source FRB 20201124A by the FAST telescope.
Yuanhong Qu, Bing Zhang, Pawan Kumar
doaj +1 more source
Off-axis Afterglow Closure Relations and Fermi-LAT Detected Gamma-Ray Bursts
The Astrophysical Journal, 2023 Gamma-ray bursts (GRBs) are one of the most promising transient events for studying multiwavelength observations in extreme conditions. Observation of GeV photons from bursts would provide crucial information on GRB physics, including the off-axis ...
N. Fraija +4 more
doaj +1 more source
Structural insights into an engineered feruloyl esterase with improved MHET degrading properties
FEBS Letters, EarlyView.A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa +5 more
wiley +1 more source