Results 61 to 70 of about 1,899,768 (248)

Gas and Stars in the Teacup Quasar Looking with the 6-m Telescope

Universe, 2023
New results on the radio-quiet type 2 quasar, known as the Teacup galaxy (SDSSJ1430+1339), based on the long-slit and 3D spectroscopic data obtained at the Russian 6-m telescope, are presented.
Alexei V. Moiseev, Alina I. Ikhsanova
doaj   +1 more source

Business ethics, law and zemiology: The criminology of social and environmental harm

Business Ethics, the Environment &Responsibility, EarlyView.
Abstract This speculative paper introduces zemiology, an extension of radical criminology which explores why many ‘crimes’ are not ‘illegal’ by focussing on the problem of ‘social harm’. Zemiology insists that we should begin with social or environmental problems, and not allow their foreclosure by the distraction of whether a particular practice is ...
Robin Klimecki, Martin Parker
wiley   +1 more source

VER J2227+608: A Hadronic PeVatron Pulsar Wind Nebula? [PDF]

Astrophysical Journal, 2019
We report the detection of GeV γ-ray emission from the very-high-energy γ-ray source VER J2227+608 associated with the “tail” region of supernova remnant (SNR) G106.3+2.7.
Y. Xin, H. Zeng, Siming Liu, Yizhong Fan, D. Wei   +4 more
semanticscholar   +1 more source

Comparison between the Emission Torus and the Measured Toroidal Magnetic Field for the Crab and Vela Nebulae

The Astrophysical Journal
Polarization measurements provide insight into the magnetic field, a critical aspect of the dynamics and emission properties around the compact object.
Wei Deng, Fei Xie, Kuan Liu, Mingyu Ge, Youli Tuo, Fabio La Monaca, Alessandro Di Marco, En-wei Liang   +7 more
doaj   +1 more source

EXTENDED HARD X-RAY EMISSION FROM THE VELA PULSAR WIND NEBULA [PDF]

, 2011
The nebula powered by the Vela pulsar is one of the best examples of an evolved pulsar wind nebula, allowing access to the particle injection history and the interaction with the supernova ejecta.
F. Mattana, D. Gotz, R. Terrier, L. Bouchet, G. Ponti, M. Falanga, M. Renaud, I. Caballero, S. Soldi, J. A. Z. Heras, S. Schanne   +10 more
semanticscholar   +1 more source

Spatially Resolved Temperature and Density Structures of Nearby H ii Regions

The Astrophysical Journal, 2023
Photoionization models frequently assume constant temperature or density within H ii regions. We investigate this assumption by measuring the detailed temperature and density structures of four H ii regions in the Large Magellanic Cloud and the Small ...
Yifei Jin, Ralph Sutherland, Lisa J. Kewley, David C. Nicholls   +3 more
doaj   +1 more source

Volume measurement of microparticles using SEM photogrammetry and 3‐D reconstruction

Meteoritics &Planetary Science, EarlyView.
Abstract In this paper, we introduce a method for volume measurement of microparticles that includes scanning electron microscope photogrammetry with 3‐D model construction. Our results show that our method limits the volume uncertainty to ±10%, which is a significant improvement compared to previous methods (which likely overestimated volume by 100 ...
Y. Zheng, X. Yang, M. Valdes, A. M. Davis, P. R. Heck   +4 more
wiley   +1 more source

Rotation of the Andromeda Nebula from a Spectroscopic Survey of Emission Regions

, 1970
Spectia of sixty-seven H Ir regions from 3 to 24 kpc from the nucleus of M31 have been obtained with the DTM image-tube spectrograph at a dispersion of 135 A mm '. Radial velocities, principally from Ha, have been determined with an accuracy of 10 km sec
V. Rubin, W. Ford
semanticscholar   +1 more source

Measurement of the Crab Nebula Spectrum Past 100 TeV with HAWC

Astrophysical Journal, 2019
We present TeV gamma-ray observations of the Crab Nebula, the standard reference source in ground-based gamma-ray astronomy, using data from the High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory.
A. Abeysekara, A. Albert, R. Alfaro, C. Alvarez, J. Álvarez, J. Camacho, R. Arceo, J. C. Arteaga-Velázquez, K. Arunbabu, D. Rojas, H. Solares, V. Baghmanyan, E. Belmont-Moreno, S. Benzvi, C. Brisbois, K. Caballero-Mora, T. Capistrán, A. Carramiñana, S. Casanova, U. Cotti, J. Cotzomi, S. León, E. D. L. Fuente, C. D. León, S. Dichiara, B. Dingus, M. DuVernois, J. C. Díaz-Vélez, R. Ellsworth, K. Engel, C. Espinoza, B. Fick, H. Fleischhack, N. Fraija, A. Galván-Gámez, J. García-González, F. Garfias, M. González, J. Goodman, J. P. Harding, S. Hernández, J. Hinton, B. Hona, F. Hueyotl-Zahuantitla, C. Hui, P. Hüntemeyer, A. Iriarte, A. Jardin-Blicq, V. Joshi, S. Kaufmann, D. Kieda, A. Lara, William H. Lee, H. L. Vargas, J. Linnemann, A. Longinotti, G. Luis-Raya, J. Lundeen, K. Malone, S. Marinelli, O. Martinez, I. Martinez-Castellanos, J. Martínez-Castro, H. Martínez-Huerta, J. Matthews, P. Miranda-Romagnoli, J. A. Morales-Soto, E. Moreno, M. Mostafá, A. Nayerhoda, L. Nellen, M. Newbold, M. Nisa, R. Noriega-Papaqui, A. Peisker, E. Pérez-Pérez, J. Pretz, Z. Ren, C. Rho, C. Rivière, D. Rosa-González, M. Rosenberg, E. Ruiz-Velasco, H. Salazar, F. Greus, A. Sandoval, Michael Schneider, H. Schoorlemmer, M. Arroyo, G. Sinnis, A. Smith, R. Springer, P. Surajbali, E. Tabachnick, M. Tanner, O. Tibolla, K. Tollefson, I. Torres, T. Weisgarber, S. Westerhoff, J. Wood, T. Yapici, A. Zepeda, H. Zhou   +103 more
semanticscholar   +1 more source

Multiband Nonthermal Radiative Properties of the Pulsar Wind Nebula CTB 87

The Astrophysical Journal
The pulsar wind nebula CTB 87 (G74.9+1.2) is one of the sources emitting γ -rays with energies higher than 10 TeV, as measured by the Very Energetic Radiation Imaging Telescope Array System telescope.
Yunlu Gong, Liancheng Zhou, Qi Xia, Haiyun Zhang, Jun Fang, Li Zhang   +5 more
doaj   +1 more source