Found 1094 results, showing the newest relevant preprints. Sort by relevancy only.Update me on new preprints

MeV Gamma-ray imaging spectroscopic observation for Galactic Center and Cosmic Background MeV gammas by SMILE-2+ Balloon Experiment

In 2018 April, we (SMILE-project in Comic-ray Group of Kyoto University) have observed MeV gamma rays for whole southern sky by Electron Tracking Compton Camera (ETCC) using JAXA balloon at Australia during one-day. (SMILE2+ Project) By measuring all parameters of Compton scattering in every gamma,... Expand abstract.
8 days ago
10/10 relevant
arXiv

Comparative intra-night optical variability of X-ray and $\gamma$-ray detected narrow-line Seyfert 1 galaxies

In a systematic program to characterise the intra-night optical variability (INOV) of different classes of narrow-line Seyfert 1 galaxies (NLSy1s), we report here the first comparative INOV study of NLSy1 sets detected in the X-ray and $\gamma$-ray bands. Expand abstract.
13 days ago
10/10 relevant
arXiv

Axion and dark photon limits from Crab Nebula high energy gamma-rays

The observation of cosmic sub-PeV gamma-rays from the Crab Nebula opens up the possibility of testing cosmic ray photon transparency at the multi-hundred TeV scale. Expand abstract.
16 days ago
10/10 relevant
arXiv

Axion Constraints from Quiescent Soft Gamma-ray Emission from Magnetars

Axion-like-particles (ALPs) emitted from the core of magnetars can convert to photons in the strong magnetic field of the magnetosphere. Expand abstract.
23 days ago
10/10 relevant
arXiv

XMM-Newton observations of a gamma-ray pulsar J0633+0632: pulsations, cooling and a large-scale emission

We report results of XMM-Newton observations of a $\gamma$-ray pulsar J0633+0632 and its wind nebula. Expand abstract.
23 days ago
10/10 relevant
arXiv

Shape coexistence in the neutron-deficient $^{188}$Hg investigated via lifetime measurements

Shape coexistence in the $Z \approx 82$ region has been established in mercury, lead and polonium isotopes. Expand abstract.
28 days ago
7/10 relevant
arXiv

Constraining the nuclear equation of state via gravitational-wave radiation of short gamma-ray burst remnants

The observed internal plateau of X-ray emission in some short GRBs suggests the formation of a remnant supra-massive magnetar following a double neutron star (NS) merger. Expand abstract.
37 days ago
8/10 relevant
arXiv

Linking extended and plateau emissions of short gamma-ray bursts

Some short gamma-ray bursts (SGRBs) show a longer lasting emission phase, called extended emission (EE) lasting $\sim 10^{2-3}\,\rm s$, as well as a plateau emission (PE) lasting $\sim10^{4-5}\,\rm s$. Expand abstract.
40 days ago
10/10 relevant
arXiv

GeV-TeV Counterparts of SS 433/W50 from Fermi-LAT and HAWC Observations

The extended jets of the microquasar SS 433 have been observed in optical, radio, X-ray, and recently very-high-energy (VHE) $\gamma$-rays by HAWC. Expand abstract.
42 days ago
4/10 relevant
arXiv

Gamma-ray emission in alpha-particle reactions with C, Mg, Si, Fe

The data are compared with predictions of a modern nuclear reaction code and cross-section curves of the latest evaluation for gamma-ray line emission in accelerated-particle interactions in solar flares. Expand abstract.
42 days ago
10/10 relevant
arXiv