Results 1 to 10 of about 15,098 (205)

(Noble Gas)_n -NC⁺ Molecular Ions in Noble Gas Matrices: Matrix Infrared Spectra and Electronic Structure Calculations. [PDF]

Chemistry, 2022
CCSD(T) calculated Ng−C−N+ structures and observed frequencies. The bond lengths on top are in Å unit, the natural charges in blue below atoms, and the observed C−N stretching frequencies (cm−1) in a matrix of noble gas on right side. Reactions of laser ablated Zn, Cd, and Hg atoms with HCN have provided an opportunity to observe photoionization of CN,
Tsegaw YA, Li H, Andrews L, Cho HG, Voßnacker P, Beckers H, Riedel S.   +6 more
europepmc   +2 more sources

Bursts of the Crab Nebula gamma-ray emission at high and ultra-high energies [PDF]

EPJ Web of Conferences, 2017
Characteristics of the flares of gamma rays detected from the Crab Nebula by the AGILE and Fermi-LAT satellite instruments are compared with those of a gamma ray burst recorded by several air shower arrays on February 23, 1989 and with one recent ...
Lidvansky A.S.
doaj   +3 more sources

Shedding new light on the Crab with polarized X-rays [PDF]

Scientific Reports, 2017
Strong magnetic fields, synchrotron emission, and Compton scattering are omnipresent in compact celestial X-ray sources. Emissions in the X-ray energy band are consequently expected to be linearly polarized. X-ray polarimetry provides a unique diagnostic
M. Chauvin, H.-G. Florén, M. Friis, M. Jackson, T. Kamae, J. Kataoka, T. Kawano, M. Kiss, V. Mikhalev, T. Mizuno, N. Ohashi, T. Stana, H. Tajima, H. Takahashi, N. Uchida, M. Pearce   +15 more
doaj   +2 more sources

EVOLUTION OF THE CRAB NEBULA RADIO EMISSION

Odessa Astronomical Publications, 2017
In 1977-1992 the flux density of the Crab Nebula in respect to Orion Nebula was measured at the frequency of 927 MHz with the same 10-m radio telescope.
E. N. Vinyajkin
doaj   +2 more sources

Scaled laboratory experiments explain the kink behaviour of the Crab Nebula jet [PDF]

Nature Communications, 2016
The periodical change of the Crab nebula’s jet direction challenges our understanding of astrophysical jet dynamics. Here the authors use high-power lasers to create a jet that can be directly compared to the Crab nebula’s, and report the detection of ...
C. K. Li, P. Tzeferacos, D. Lamb, G. Gregori, P. A. Norreys, M. J. Rosenberg, R. K. Follett, D. H. Froula, M. Koenig, F. H. Seguin, J. A. Frenje, H. G. Rinderknecht, H. Sio, A. B. Zylstra, R. D. Petrasso, P. A. Amendt, H. S. Park, B. A. Remington, D. D. Ryutov, S. C. Wilks, R. Betti, A. Frank, S. X. Hu, T. C. Sangster, P. Hartigan, R. P. Drake, C. C. Kuranz, S. V. Lebedev, N. C. Woolsey   +28 more
doaj   +2 more sources

Dissecting the Crab Nebula with JWST: Pulsar Wind, Dusty Filaments, and Ni/Fe Abundance Constraints on the Explosion Mechanism [PDF]

The Astrophysical Journal Letters
We present JWST observations of the Crab Nebula, the iconic remnant of the historical SN 1054. The observations include NIRCam and MIRI imaging mosaics plus MIRI/MRS spectra that probe two select locations within the ejecta filaments.
Tea Temim, J. Martin Laming, P. J. Kavanagh, Nathan Smith, Patrick Slane, William P. Blair, Ilse De Looze, Niccolò Bucciantini, Anders Jerkstrand, Nicole Marcelina Gountanis, Ravi Sankrit, Dan Milisavljevic, Armin Rest, Maxim Lyutikov, Joseph DePasquale, Thomas Martin, Laurent Drissen, John Raymond, Ori D. Fox, Maryam Modjaz, Anatoly Spitkovsky, Louis-Gregory Strolger   +21 more
doaj   +2 more sources

The NIKA polarimeter on science targets: Crab nebula observations at 150 GHz and dual-band polarization images of Orion Molecular Cloud OMC-1 [PDF]

EPJ Web of Conferences, 2020
We present here the polarization system of the NIKA camera and give a summary of the main results obtained and performed studies on Orion and the Crab nebula.
Ritacco A., Adam R., Ade P., André P., Andrianasolo A., Aussel H., Beelen A., Benoît A., Bideaud A., Bourrion O., Calvo M., Catalano A., Comis B., De Petris M., Désert F.-X., Doyle S., Driessen E.F.C., Gomez A., Goupy J., Kéruzoré F., Kramer C., Ladjelate B., Lagache G., Leclercq S., Lestrade J.-F., Macías-Pérez J.F., Mauskopf P., Maury A., Mayet F., Monfardini A., Perotto L., Pisano G., Ponthieu N., Revéret V., Romero C., Roussel H., Ruppin F., Schuster K., Shu S., Sievers A., Tucker C., Zylka R.   +41 more
doaj   +1 more source

Testing Lorentz invariance of electrons with LHAASO observations of PeV gamma-rays from the Crab Nebula

Physics Letters B, 2022
The Large High Altitude Air Shower Observatory (LHAASO) recently reported the detection of gamma-ray emissions with energies up to 1.1PeV from the Crab Nebula. Using the absence of vacuum Cherenkov effect by inverse-Compton electrons, we improve previous
Chengyi Li, Bo-Qiang Ma
doaj   +1 more source

Ar+ ArH+ Reactive Collisions of Astrophysical Interest: The Case of 36Ar

ChemPhysChem, Volume 24, Issue 20, October 17, 2023., 2023
A complete theoretical investigation of the 36Ar+36ArH+ reactive collision involving the most abundant Argon isotope in the interstellar medium. Abstract The reactive collision between 36Ar and the 36ArH+ species has been investigated by means of quantum mechanical (QM), quasiclassical trajectories (QCT) and statistical quantum mechanical (SQM ...
María Judit Montes de Oca‐Estévez, Beatriz Darna, Borja García‐Ruiz, Rita Prosmiti, Tomás González‐Lezana, Debasish Koner   +5 more
wiley   +1 more source

Metal in mesosiderites: Evidence for redox and fractional crystallization

Meteoritics &Planetary Science, Volume 58, Issue 9, Page 1211-1228, September 2023., 2023
Abstract Mesosiderites are an amalgamation of crustal silicates and molten metal, and their formational history is not well understood. It is widely believed that redox reactions occurred in the mesosiderites during metal–silicate mixing. Previous studies evaluated redox reactions by studying the silicates within mesosiderites, but little attention has
R. G. Mayne, L. Caves, T. J. McCoy, R. D. Ash, W. F. McDonough   +4 more
wiley   +1 more source