Results 81 to 90 of about 34,908 (184)

Deciphering the “Missing Xenon Paradox” in Celestial Bodies: A Multifaceted Perspective Toward Demystifying This Enigma

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Xenon (Xe) is a heavy noble gas with intriguing chemical properties, such as having several stable isotopes and the ability to form compounds under extreme conditions. Despite the predictions based on cosmochemical models that suggest xenon should be relatively abundant in planetary reservoirs, empirical data indicate a significant depletion ...
Avinash Kumar Both, Avradip Ghosh, Chin Li Cheung   +2 more
wiley   +1 more source

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

Influence of Mars Topography on Radiation Dose Detected by the Mars Science Laboratory and Assessment of Mars Surface Albedo Radiation

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract The Radiation Assessment Detector (RAD) on the Curiosity rover has been characterizing the Martian surface radiation field since 2012. The dose observed by RAD is influenced by a variety of factors, including an essential one, the terrain. After parking near Murray Buttes in September 2016 where it first detected a ∼5% decrease in dose rate ...
Jingnan Guo, Changqi Tian, Gabin Charpentier, Robert F. Wimmer‐Schweingruber, Salman Khaksarighiri, Lu Pan, Jan Leo Löwe, Bent Ehresmann, Donald M. Hassler, Cary Zeitlin, Daniel Matthiä, Thomas Berger, Günther Reitz   +12 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

From the warm magnetized atomic medium to molecular clouds

, 2008
{It has recently been proposed that giant molecular complexes form at the sites where streams of diffuse warm atomic gas collide at transonic velocities.} {We study the global statistics of molecular clouds formed by large scale colliding flows of warm ...
Audit, Ballesteros-Paredes, Crutcher, E. Audit, E. Vázquez-Semadeni, Fromang, Fryxell, Glover, Heitsch, Heitsch, Hennebelle, Hennebelle, Hennebelle, Koyama, Koyama, P. Hennebelle, R. Banerjee, R. S. Klessen, Teyssier, Troland, Vázquez-Semadeni, Vázquez-Semadeni, Williams   +22 more
core   +3 more sources

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

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

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

FAST Search for Circumstellar Atomic Hydrogen. IV. Bubbles Associated with Planetary Nebulae

The Astronomical Journal
Investigating the bubbles generated by the interaction between asymptotic giant branch stellar outflows and the interstellar medium (ISM) is pivotal for elucidating the mechanism by which evolved low- to intermediate-mass stars enrich the ISM with heavy ...
Jun-Yang Liu, Yong Zhang, Xu-Jia Ouyang
doaj   +1 more source