Results 81 to 90 of about 34,658 (198)
The Formation of Milky Way “Bones”: Ubiquitous HI Narrow Self-absorption Associated with CO Emission
The Astrophysical Journal LettersLong and skinny molecular filaments running along Galactic spiral arms are known as “bones,” since they make up the skeleton of the Milky Way. However, their origin is still an open question.
Shenglan Sun +3 more
doaj +1 more source
On the structure of the turbulent interstellar atomic hydrogen. I- Physical characteristics [PDF]
, 2006 {We study in some details the statistical properties of the turbulent 2-phase interstellar atomic gas.{We present high resolution bidimensional numerical simulations of the interstellar atomic hydrogen which describe it over 3 to 4 orders of magnitude in
Audit, E., Hennebelle, P.
core +4 more sources
Advanced Engineering Materials, Volume 27, Issue 22, November 2025.Additive manufacturing (AM) transforms space hardware by enabling lightweight, high‐performance, and on‐demand production. This review outlines AM processes—powder bed fusion (PBF), directed energy deposition (DED), binder jetting (BJ), sheet lamination (SL), and material extrusion (ME)—applied to propulsion, satellite structures, and thermal devices ...
Stelios K. Georgantzinos +8 more
wiley +1 more source
The H i Reservoir in Central Spiral Galaxies and the Implied Star Formation Process
The Astrophysical Journal LettersThe cold interstellar medium (ISM) as the raw material for star formation is critical to understanding galaxy evolution. It is generally understood that galaxies stop making stars when, in one way or another, they run out of gas. However, here we provide
Jing Dou +16 more
doaj +1 more source
Estimating Soft X‐Ray Emission From Uranus's Magnetosheath
Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.Abstract Soft X‐ray emission occurs within planetary magnetosheaths when highly charged solar wind ions undergo charge exchange with neutrals. The emission can provide dynamic views of the magnetosheath and cusps, allowing for investigations of the solar wind interaction with a planetary magnetosphere.
D. Naylor +4 more
wiley +1 more source
Small-area molecular clouds without shielding
, 2002 Using the IRAM 30m telescope two molecular structures have been detected which cover very small areas ...
Heithausen, Andreas
core +1 more source
Cool Dark Gas in Cygnus X: The First Large-scale Mapping of Low-frequency Carbon Recombination Lines
The Astrophysical JournalUnderstanding the transition from atomic gas to molecular gas is critical to explain the formation and evolution of molecular clouds. However, the gas phases involved, cold H i and CO-dark molecular gas, are challenging to directly observe and physically
Kimberly L. Emig +16 more
doaj +1 more source
A gas-phase “top-down” chemical link between aldehydes and alcohols
Frontiers in Astronomy and Space SciencesIntroductionAlcohols and aldehydes represent two key classes of interstellar complex organic molecules (COMs). This work seeks to better understand their possible chemical connections, with a focus on such molecules in the sources of the star-forming ...
Christopher N. Shingledecker +5 more
doaj +1 more source
The ratio of molecular to atomic gas in spiral galaxies as a function of morphological type [PDF]
In order to gain an understanding of the global processes which influence cloud and star formation in disk galaxies, it is necessary to determine the relative amounts of atomic, molecular, and ionized gas both as a function of position in galaxies and ...
Knezek, Patricia M., Young, Judith S.
core +1 more source
Discovery of a Shell of Neutral Atomic Hydrogen Surrounding the Carbon Star IRC+10216
, 2015 We have used the Robert C. Byrd Green Bank Telescope to perform the most sensitive search to date for neutral atomic hydrogen (HI) in the circumstellar envelope (CSE) of the carbon star IRC+10216.
Bertre, T. Le +2 more
core +2 more sources