Results 81 to 90 of about 34,807 (192)

The Formation of Milky Way “Bones”: Ubiquitous HI Narrow Self-absorption Associated with CO Emission

The Astrophysical Journal Letters
Long 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, Ke Wang, Xunchuan Liu, Fengwei Xu   +3 more
doaj   +1 more source

Testing models for molecular gas formation in galaxies: hydrostatic pressure or gas and dust shielding?

, 2010
Stars in galaxies form in giant molecular clouds that coalesce when the atomic hydrogen is converted into molecules. There are currently two dominant models for what property of the galactic disk determines its molecular fraction: either hydrostatic ...
Beck, Bell, Bell, Bigiel, Blitz, Blitz, Bolatto, Bowen, Brooks, Chung, Dale, de Vaucouleurs, Drissen, Fumagalli, Gil de Paz, Gnedin, Gnedin, Hopkins, Hunt, Hunt, Imara, Izotov, Izotov, Izotov, Kennicutt, Kobulnicky, Krumholz, Krumholz, Kunth, Lee, Lee, Leitherer, Leon, Leroy, Leroy, Leroy, Leroy, Leslie K. Hunt, Mark R. Krumholz, McKee, Michele Fumagalli, Noeske, Origlia, Pelupessy, Pustilnik, Reines, Robertson, Sage, Schmitt, Smith, Taylor, Thuan, Thuan, Thuan, Thuan, van Zee, van Zee, van Zee, Vanzi, Walter, Whitmore, Wolfire, Wolfire, Wong   +63 more
core   +1 more source

First Principles Rovibronic Absorption Spectra of HF Molecule

Journal of Computational Chemistry, Volume 47, Issue 6, March 5, 2026.
Hydrogen fluoride (HF) is astrophysically important, as it has been detected in sunspots, Venus, red giants, and the interstellar medium, serving as a probe of exoplanet atmospheres. This article presents an ab initio investigation of HF rovibronic spectroscopy, combining high‐level electronic‐structure data with nuclear‐motion solutions and refinement
Nariman Abu El Kher, Maha Shibli, Mahmoud Korek, Sergei N. Yurchenko, Jonathan Tennyson, Nayla El‐Kork   +5 more
wiley   +1 more source

The H i Reservoir in Central Spiral Galaxies and the Implied Star Formation Process

The Astrophysical Journal Letters
The 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, Yingjie Peng, Qiusheng Gu, Alvio Renzini, Luis C. Ho, Filippo Mannucci, Emanuele Daddi, Chengpeng Zhang, Jiaxuan Li, Yong Shi, Tao Wang, Dingyi Zhao, Cheqiu Lyu, Di Li, Feng Yuan, Roberto Maiolino, Yulong Gao   +16 more
doaj   +1 more source

Far-Infrared and Submillimeter Observations of High Redshift Galaxies

, 1999
Observations at far-infrared and submillimeter wavelengths promise to revolutionize the study of high redshift galaxies and AGN by providing a unique probe of the conditions within heavily extinguished regions of star formation and nuclear activity ...
Neufeld, David A.
core   +2 more sources

Confined Chemistry in Space: Zeolite‐Supported Fe13 Nanoclusters Modulate CS Reactivity

Small Structures, Volume 7, Issue 3, March 2026.
The study explores how an Fe13 cluster confined in chabazite reshapes the reaction of CS and H2 under astrochemical conditions. Confinement promotes C–S bond cleavage over hydrogenation, directing chemistry toward CH4 and H2S formation. Additional CS enables CS2 and C2 species. Microkinetic analysis identifies protoplanetary environments where zeolites
Gerard Pareras, Albert Rimola
wiley   +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

Cool Dark Gas in Cygnus X: The First Large-scale Mapping of Low-frequency Carbon Recombination Lines

The Astrophysical Journal
Understanding 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, Pedro Salas, Loren D. Anderson, D. Anish Roshi, Lars Bonne, Alberto D. Bolatto, Isabelle A. Grenier, Rebecca C. Levy, Dylan J. Linville, Matteo Luisi, M. Riley Owens, J. Poojapriyatharsheni, Nicola Schneider, Luigi Tibaldo, Alexander G. G. M. Tielens, Stefanie K. Walch, Glenn J. White   +16 more
doaj   +1 more source

A gas-phase “top-down” chemical link between aldehydes and alcohols

Frontiers in Astronomy and Space Sciences
IntroductionAlcohols 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, Germán Molpeceres, A. Mackenzie Flowers, Deaton Warren, Emma Stanley, Anthony Remijan   +5 more
doaj   +1 more source

Fermi LAT measurements of diffuse gamma-ray emission: results at the first-year milestone

, 2010
For more than one year the Fermi Large Area Telescope has been surveying the gamma-ray sky from 20 MeV to more than 300 GeV with unprecedented statistics and angular resolution.
Tibaldo, Luigi
core   +1 more source