Results 61 to 70 of about 1,887,037 (257)

Exploring the high abundance discrepancy in the planetary nebula IC 4663

Frontiers in Astronomy and Space Sciences, 2023
This article presents an in-depth analysis of integral field unit spectroscopy performed on the Galactic planetary nebula (PN) IC 4663, with a primary focus on investigating its physical characteristics, chemical composition, and morphological properties.
M. Mohery, A. Ali, Aya A. Khames, S. Snaid, A. Mindil   +4 more
doaj   +1 more source

Nebulae (emission / absorption)

Culture and Cosmos, 2012
My presentation consists of a collage on panel. Using colour laser copies of nebulae, the dual composition recombines torn pieces of several nebular images. Optically entangled from light colour patterns, the focus of each nebula resembles the opposing behaviour of absorption and emission nebula. The collages include false colour composite astronomical
openaire   +1 more source

Emission of HeH(+) in nebulae

The Astrophysical Journal, 1993
The formation and destruction processes of HeH + in nebulae are discussed, and calculations of the abundances of HeH + are presented. It is shown that for effective temperatures of the ionizing source exceeding 50,000 K, the abundances are of the order of 10 12 cm −2 , largely independent of the nebular parameters.
C. Cecchi-Pestellini, A. Dalgarno
openaire   +1 more source

Emission Nebulae as Radio Sources [PDF]

Australian Journal of Physics, 1956
Attempts have been made to detect 14 bright emission nebulae at a wavelength of 3?5 m using a pencil-beam radio telescope with a beamwidth of 50 min of arc. Of these nebulae, six were probably observed in emission, seven were undetectable, and one, NGC 6357, was observed in absorption; radio isophotes were obtained for NGC 2237 and NGC 3372.
BY Mills, AG Little, KV Sheridan
openaire   +1 more source

PROPERTIES AND SPATIAL DISTRIBUTION OF DUST EMISSION IN THE CRAB NEBULA [PDF]

, 2011
Recent infrared (IR) observations of freshly formed dust in supernova remnants have yielded significantly lower dust masses than predicted by theoretical models and measured from high-redshift observations.
T. Temim, G. Sonneborn, E. Dwek, R. Arendt, R. Gehrz, P. Slane, T. Roellig   +6 more
semanticscholar   +1 more source

Conference‐Based Method: Interviewing Elites at Intergovernmental Conferences

Area, EarlyView.
Short Abstract Conferences have increasingly featured within geographical research as sites of knowledge production, performance and contestation. However, this article explores how intergovernmental conferences can be productive sites for geographical fieldwork through elite interviews on research topics such as climate geopolitics and disaster risk ...
Liam Saddington, Katie Peters
wiley   +1 more source

The Ejecta Nebula Around the Wolf–Rayet Star WR 71

The Astronomical Journal
We present deep H α and [O iii ] images of the ejecta-rich nebulosity associated with the suspected runaway and binary Wolf–Rayet (WR) star WR 71 (HD 143414). In H α emission, the nebula appears as a crescent shaped, broken ring of clumpy emission some ${
Robert A. Fesen, Manuel C. Peitsch, Martin R. Pugh, Bray Falls, Marcel Drechsler   +4 more
doaj   +1 more source

Explicit Methodologies for Normative Evaluation in Public Policy, as Applied to Carbon Budgets

Journal of Applied Philosophy, EarlyView.
ABSTRACT What could philosophical or justice perspectives contribute to climate (and other applied philosophy) policy discussions? This question is important for philosophers on government policy committees. This article identifies two novel concerns about such contexts (which I call ‘contingent selection’ and ‘committee deference’) and systematizes ...
Kian Mintz‐Woo
wiley   +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

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. 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, M. 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