Results 81 to 90 of about 1,887,037 (257)
JWST/MIRI Study of the Enigmatic Mid-infrared Rings in the Planetary Nebula NGC 1514
The Astronomical JournalWhile NGC 1514 is an elliptical, but complex, planetary nebula at optical wavelengths, it was discovered to have a pair of infrared-bright, axisymmetric rings contained within its faint outer shell during the course of the Wide-field Infrared Survey ...
Michael E. Ressler +5 more
doaj +1 more source
Magnetic Fields in the Horsehead Nebula
The Astronomical Journal, 2023 We present the first polarized dust emission measurements of the Horsehead Nebula, obtained using the POL-2 polarimeter on the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) camera on the James Clerk Maxwell Telescope.
Jihye Hwang +4 more
doaj +1 more source
Deuterium Balmer Emission from Nebulae [PDF]
Symposium - International Astronomical Union, 2000 We report on the detection and first identification of the deuterium Balmer lines dα and dβ, observed in emission in the Orion Nebula (M 42). The excitation mechanism is UV fluorescence from the Lyman(D i) lines at the interface between the H ii region and the molecular cloud. These lines may open the possibility to measure D/H in galactic H ii regions
Guillaume Hébrard +4 more
openaire +1 more source
Emission-Line Fluxes of Northern Planetary Nebulae [PDF]
Publications of the Astronomical Society of Australia, 2015 AbstractWe present long slit spectrophotometric emission line fluxes of bright and extended (< 5 arcsec in diameter) planetary nebulae (PNe), selected from a catalogue with suitable equatorial coordinates for northern hemisphere. In total, 17 planetary nebulae have been chosen and observed in 2008–2010.
Aksaker, N. +3 more
openaire +4 more sources
ON CALIBRATIONS USING THE CRAB NEBULA AND MODELS OF THE NEBULAR X-RAY EMISSION [PDF]
, 2010 Motivated by a paper of Kirsch et al. on possible use of the Crab Nebula as a standard candle for calibrating X-ray response functions, we examine consequences of intrinsic departures from a single (absorbed) power law upon such calibrations.
M. Weisskopf +7 more
semanticscholar +1 more source
Business Strategy and the Environment, Volume 35, Issue 1, Page 1076-1096, January 2026.ABSTRACT The circular economy (CE) offers a transformative approach to addressing global sustainability challenges, yet few frameworks integrate it with business strategy, systems thinking (ST) and asset management (AM), especially within critical infrastructure sectors like rail. This paper conducts a comprehensive literature review to assess existing
Carl Waring, Kapila Liyanage
wiley +1 more source
X-Ray Emission from the Guitar Nebula [PDF]
The Astrophysical Journal, 1997 We have detected weak soft X-ray emission from the Pulsar Wind Nebula trailing the high velocity star PSR 2224+65 (the `Guitar Nebula'). This X-ray flux gives evidence of ~10^7 eV particles in the pulsar wind and constrains the properties of the post-shock flow.
Romani, Roger W. +2 more
openaire +2 more sources
Meteoritics &Planetary Science, Volume 61, Issue 1, Page 168-181, January 2026.Abstract Samples returned from asteroid Ryugu by the Hayabusa2 mission are dominated by fine‐grained matrix material made of phyllosilicates and nanosulfides. Here, we report the mineralogical, textural, and chemical characteristics of nanosulfide‐rich regions identified in Ryugu particles.
Roberto Conconi +9 more
wiley +1 more source
Extended X-ray Emission from Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1993 We present first results from the ROSAT All Sky Survey on X-ray emission of planetary nebulae (PNe). For the first time extended X-ray emission from PNe was detected. This is the case for NGC 6543, NGC 6853, A 12, NGC 4361 (and LoTr 5). X-ray emission compatible with a point source was detected from BD+30°3639, however, the spectral distribution of the
H.C. Kreysing +4 more
openaire +1 more source
THE HIGH-ENERGY EMISSION OF THE CRAB NEBULA FROM 20 keV TO 6 MeV WITH INTEGRAL SPI [PDF]
, 2009 The SPI spectrometer aboard the International Gamma-Ray Astrophysics Laboratory mission regularly observes the Crab Nebula since 2003. We report on observations distributed over 5.5 years and investigate the variability of the intensity and spectral ...
E. Jourdain, J. Roques
semanticscholar +1 more source