Results 71 to 80 of about 4,742 (219)

Evidence of a Cloud–Cloud Collision from Overshooting Gas in the Galactic Center

The Astrophysical Journal, 2023
The Milky Way is a barred spiral galaxy with bar lanes that bring gas toward the Galactic center. Gas flowing along these bar lanes often overshoots, and instead of accreting onto the Central Molecular Zone (CMZ), it collides with the bar lane on the ...
Savannah R. Gramze, Adam Ginsburg, David S. Meier, Juergen Ott, Yancy Shirley, Mattia C. Sormani, Brian E. Svoboda   +6 more
doaj   +1 more source

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

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

Deuterated Polycyclic Aromatic Hydrocarbons in the Interstellar Medium: Constraints from the Orion Bar as Observed by the James Webb Space Telescope

The Astrophysical Journal
The gas-phase abundances of deuterium (D) in the local interstellar medium exhibit considerable regional variations. Particularly, in some regions the gas-phase D abundances are substantially lower than the primordial D abundance generated in the Big ...
X. J. Yang, Aigen Li
doaj   +1 more source

The density distribution and 58.4 nm radiation intensity of interstellar helium in the heliosphere: a model simulation

Earth and Planetary Physics
Research on the interstellar medium and its interaction with the solar system constitutes a significant topic in planetary physics. As the Sun traverses the local interstellar cloud, interstellar neutrals penetrate the heliosphere, forming the ...
JiaLing Lyu, ChongJing Yuan, Fei He, BeiLi Ying   +3 more
doaj   +1 more source

Discovery of high-ionization far-ultraviolet line emission from the interstellar medium

The Astrophysical Journal, 1990
Diffuse, highly ionized line emission from the 1550 lines of C IV and the 1663 lines of O II was discovered on Space Shuttle mission 61-C. The emission-lines ratios are consistent with a single temperature in most directions, although there is some evidence that the emission results from gas with a nonequilibrium ionization balance and a distribution ...
Christopher Martin, Stuart Bowyer
openaire   +1 more source

Model calculations for cosmogenic nuclides in meteorites and the lunar surface. 1. Long‐lived radionuclides

Meteoritics &Planetary Science, Volume 61, Issue 4, Page 600-620, April 2026.
Abstract Production rates for the cosmogenic radionuclides 10Be, 14C, 26Al, 36Cl, 41Ca, 53Mn, and 60Fe in a large variety of meteorites, that is, ordinary chondrites (H, L, LL), carbonaceous chondrites, HED meteorites, ureilites, Martian meteorites, and iron meteorites and in the uppermost ~2 m of the lunar surface are modeled.
Ingo Leya
wiley   +1 more source

Observations of O VI Emission from the Diffuse Interstellar Medium

, 2001
International audienceWe report the first Far-Ultraviolet Spectroscopic Explorer measurements of diffuse O VI (λλ1032, 1038) emission from the general diffuse interstellar medium outside of supernova remnants or superbubbles.
Siegmund, O. H. W., York, D. G., Andersson, B. G., Sankrit, R., Sahnow, D. J., Murphy, E. M., Blair, W. P., Sembach, K. R., Howk, J. C., Roth, K. C., Savage, B. D., Vidal-Madjar, A., Fullerton, A. W., Kruk, J. W., Shull, J. M., Edelstein, J., Gry, C., Jenkins, E. B., Welsh, B. Y., Shelton, R. L., Oey, M. S., Oegerle, W. R., Linsky, J. L., Moos, H. W., Dixon, W. V.   +24 more
core   +1 more source

Resolved ALMA [C ii] 158 μm Observations at Cosmic Noon: Interstellar Medium Structure and Dynamics of the Starbursting QSO SDSS J1000

The Astrophysical Journal
We present spatially resolved Atacama Large Millimeter/submillimeter Array Band 9 observations of the [C ii ] 158 μ m fine structure line from an optically selected quasar, SDSS J100038.01+020822.4 (J1 000 ), at z = 1.8275.
Christopher Rooney, Bo Peng, Amit Vishwas, Gordon Stacey, Thomas Nikola, Cody Lamarche, Catie Ball, Carl Ferkinhoff, Drew Brisbin, Steven Hailey-Dunsheath   +9 more
doaj   +1 more source

Faint Optical Line Emission from the Diffuse Interstellar Medium: Observations and Implications [PDF]

Symposium - International Astronomical Union, 1990
Diffuse galactic Hα emission appears to cover the entire sky with an intensity that ranges from 3–12 R near the galactic equator to 0.25–0.8 R near the galactic poles. Observations of this H-recombination line and the forbidden lines, [S II] 6716 Å, [N II] 6583 Å, and [O III] 5007 Å, indicate that the emission originates from a low-density, 2–3 kpc ...
openaire   +1 more source