Results 111 to 120 of about 110,738 (286)

The Variable Reflection Nebula Cepheus A East

, 2008
We report K'-band imaging observations of the reflection nebula associated with Cepheus A East covering the time interval from 1990 to 2004. Over this time the reflection nebula shows variations of flux distribution, which we interpret as the effect of ...
Bally, Barnard, Brogan, Carpenter, Cohen, Connelley, Cunningham, Cunningham, Curiel, Eli Bressert, Gallimore, Goetz, Hodapp, Jiménez-Serra, Jones, Klaus W. Hodapp, Knox Shaw, Lampland, Lenzen, Seale, Skrutskie, Sonnentrucker, Torrelles   +22 more
core   +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

Nature Versus Nurture: Luminous Blue Variable Nebulae in and near Massive Stellar Clusters at the Galactic Center

, 2014
Three Luminous Blue Variables (LBVs) are located in and near the Quintuplet Cluster at the Galactic Center: the Pistol star, G0.120-0.048, and qF362. We present imaging at 19, 25, 31, and 37 {\mu}m of the region containing these three LBVs, obtained with
Adams, Joseph D., Herter, Terry L., Lau, Ryan M., Morris, Mark R.   +3 more
core   +1 more source

Origin and loss of nebula-captured hydrogen envelopes from ‘sub’- to ‘super-Earths’ in the habitable zone of Sun-like stars [PDF]

, 2014
We investigate the origin and loss of captured hydrogen envelopes from protoplanets having masses in a range between ‘sub-Earth’-like bodies of 0.1 M⊕ and ‘super-Earths’ with 5 M⊕ in the habitable zone at 1 au of a Sun-like G star, assuming that their ...
H. Lammer, A. Stökl, N. Erkaev, N. Erkaev, E. Dorfi, P. Odert, P. Odert, M. Güdel, Y. Kulikov, K. Kislyakova, M. Leitzinger   +10 more
semanticscholar   +1 more source

Anticorrelation Between Flux and Photon Index of Hard-X-Ray Emission from the Crab

The Astrophysical Journal
Using Swift Burst Alert Telescope event-mode data during gamma-ray burst occurrences, we conduct spectral analysis for the Crab system. From 38 good observations, which span a period of 18 yr from 2006 to 2023, we find that the Crab’s X-ray flux not only
Koothodil Abhijith Augustine, Hsiang-Kuang Chang   +1 more
doaj   +1 more source

Rings and Jets around PSR J2021+3651: the `Dragonfly Nebula'

, 2008
We describe recent Chandra ACIS observations of the Vela-like pulsar PSR J2021+3651 and its pulsar wind nebula (PWN). This `Dragonfly Nebula' displays an axisymmetric morphology, with bright inner jets, a double-ridged inner nebula, and a ~30" polar jet.
Adam Van Etten, C.‐Y. Ng, English J., Rees M. J., Roger W. Romani, Zavlin V. E.   +5 more
core   +1 more source

Artificial Intelligence in Digestive Endoscopy Training—The Past, Present, and Future

Digestive Endoscopy, EarlyView.
AI may enhance endoscopy training through improved detection, guidance and evaluation, but demands careful implementation, validation and ethical governance to maximize benefits. ABSTRACT Background and Objective Artificial intelligence (AI) is reshaping gastrointestinal endoscopy, yet its role in training remains unexplored.
Jacky C. L. Ho, Zhouyao Qian, Louis H. S. Lau, Hon‐Chi Yip, Philip W. Y. Chiu   +4 more
wiley   +1 more source

Evaluating Investment in Space Programs: A Case for Theoretical Pluralism

Financial Accountability &Management, EarlyView.
ABSTRACT A perennial question repeatedly asked since the early Mercury (USA) and Salyut (then Soviet Union) space programs has been variations on the theme of “how can the cost of space exploration be justified?” This question—which in broad terms constitutes the research question considered in this paper—continues to be directed toward space agencies ...
Basil P. Tucker, Hank C. Alewine
wiley   +1 more source

The Vela Pulsar and its Synchrotron Nebula

, 2001
(Abridged) We present high-resolution Chandra X-ray observations of PSR B0833-45, the 89 ms pulsar associated with the Vela supernova remnant. We have acquired two observations separated by one month to search for changes in the pulsar and its ...
Alpar A., Arons J., Aschenbach B., Bailes M., Caraveo P. A., D. J. Helfand, DeLuca A., E. V. Gotthelf, Gurkan M. A., J. P. Halpern, Kennel C. F., Leahy D. A., Lu F. J., Lyne A. G., Manchester R. N., Markwardt C. B., Milne D. K., Radhakrishnan V., Rees M. J., Reichley P. E.   +19 more
core   +1 more source

The Nature of Christian Doctrine: A Conversation with My Critics

International Journal of Systematic Theology, EarlyView.
Abstract This article opens with a brief account of the six main themes of The Nature of Christian Doctrine, noting in particular the role of the early church as an ‘epistemic community’ of knowledge production, and the significant and helpful parallels between the modern scientific tool of ‘inference to the best explanation’ and early Christian ...
Alister E. McGrath
wiley   +1 more source