Results 21 to 30 of about 3,246 (239)

Topology of Neutral Hydrogen within the Small Magellanic Cloud [PDF]

open access: yesThe Astrophysical Journal, 2008
In this paper, genus statistics have been applied to an HI column density map of the Small Magellanic Cloud in order to study its topology. To learn how topology changes with the scale of the system, we provide the study of topology for column density maps at varying resolution.
Chepurnov, A.   +3 more
openaire   +2 more sources

Neutral hydrogen in the Large Magellanic Cloud [PDF]

open access: yesSymposium - International Astronomical Union, 1964
The neutral hydrogen gas in the Large Magellanic Cloud has been observed with the 14′.5 beam of the Parkes 210-foot telescope and the 48-channel H-line receiver. We wish to present a progress report based on computer reductions of integrated brightness and median radial velocities for some 4200 profiles.
R. X. McGee, Janice A. Milton
openaire   +1 more source

A Neutral Hydrogen Cloud in the Vicinity of the Elliptical Galaxy NGC 4318 [PDF]

open access: yesSymposium - International Astronomical Union, 1987
NGC 4318, in the Virgo Cluster, has the following optical properties: —morphological type: E (Nilson, 1973)—BoT magnitude : 13.8 (Nilson, 1973)—photometric axis : 0.8′ × 0.6′ (Nilson, 1973)—heliocentric radial velocity: −300 km s−1 (Arakelian et al., 1975)1247± 15 km s (Tonry, 1981)1215 km s−1 (Huchra et al., 1983)
Bottinelli, L.   +2 more
openaire   +2 more sources

A Neutral Hydrogen Self-Absorption Cloud in the SGPS

open access: yesThe Astrophysical Journal, 2003
Using data from the Southern Galactic Plane Survey (SGPS) we analyze an HI self-absorption cloud centered on l = 318.0 deg, b = -0.5 deg, and velocity, v = -1.1 km/s. The cloud was observed with the Australia Telescope Compact Array (ATCA) and the Parkes Radio Telescope, and is at a near kinematic distance of less than 400 pc with derived dimensions of
Kavars, D. W.   +4 more
openaire   +3 more sources

THE TURBULENCE VELOCITY POWER SPECTRUM OF NEUTRAL HYDROGEN IN THE SMALL MAGELLANIC CLOUD [PDF]

open access: yesThe Astrophysical Journal, 2015
We present the results of the Velocity Coordinate Spectrum (VCS) technique to calculate the velocity power spectrum of turbulence in the Small Magellanic Cloud (SMC) in 21cm emission. We have obtained a velocity spectral index of -3.85 and an injection scale of 2.3 kpc. The spectral index is steeper than the Kolmogorov index which is expected for shock-
Chepurnov, Alexey   +3 more
openaire   +2 more sources

The sustainable global energy economy: Hydrogen or silicon?

open access: yes, 2008
A sustainable global silicon energy economy is proposed as a potential alternative to the hydrogen economy. This first visualisation of a silicon energy economy is based on largescale and carbon-neutral metallic silicon production from major smelters ...
Bardsley, W. Earl
core   +1 more source

Results from the CERN pilot CLOUD experiment [PDF]

open access: yes, 2009
During a 4-week run in October–November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving OUtdoor Droplets (CLOUD) experiment, whose aim is to study the possible influence of cosmic rays on ...
Aplin, Karen L.   +311 more
core   +1 more source

Investigation into Triggered Star Formation by Radiative Driven Implosion [PDF]

open access: yes, 2016
When massive stars form, they emit strong, hydrogen ionising radiation fields into their molecular cloud environment, forming HII regions. This is believed to be capable of inducing effects which can trigger further star formation through a process known
Kinnear, Timothy Michael
core  

Turbulence in the interstellar medium [PDF]

open access: yes, 2014
Turbulence is ubiquitous in the insterstellar medium and plays a major role in several processes such as the formation of dense structures and stars, the stability of molecular clouds, the amplification of magnetic fields, and the re-acceleration and ...
Chian, A. C. -L.   +9 more
core   +1 more source

Designed Lewis Acid–Base Passivation for High Performance Perovskite Solar Cells

open access: yesAdvanced Functional Materials, EarlyView.
ABSTRACT Silicon's high cost and long energy payback time remain major barriers to the global expansion of solar power. In contrast, metal–halide perovskites offer abundant, solution‐processable absorbers, and have achieved efficiencies of 25%–30%, positioning them as strong competitors to silicon.
Afna Manaf   +4 more
wiley   +1 more source

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