Results 51 to 60 of about 34,908 (184)

Chemical Kinetics of 2‐, 4‐, and 2,4‐Seleno‐Uracils at Low Temperatures: Tautomerizations and Rotamerizations on Inert Matrices

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT In the interstellar medium, chemical reactions proceed under conditions vastly different to those on Earth; these include extremely low temperatures and densities and take place in the gas phase and on water–ice grains. Understanding the energetics and more importantly the kinetics of such reactions is of relevance to the consequences on how ...
Judith Wurmel, John M. Simmie
wiley   +1 more source

oMEGACat. VII. Tracing Interstellar and Intracluster Medium of ω Centauri Using Sodium Absorptions

The Astrophysical Journal
We investigate the foreground interstellar medium along the line of sight and intracluster medium of ω Centauri ( ω Cen) by measuring the equivalent width of Na I D absorptions from MUSE observations. The large line-of-sight velocity difference between ω
Z. Wang, A. C. Seth, M. Latour, J. Strader, M. Häberle, N. Neumayer, C. Clontz, S. Kamann, M. S. Nitschai, M. Alfaro-Cuello, A. Bellini, A. Feldmeier-Krause, M. Libralato, A. P. Milone, P. J. Smith, S. O. Souza, G. van de Ven   +16 more
doaj   +1 more source

Star formation across cosmic time

Fundamental Plasma Physics
The interstellar medium of galaxies is composed of multiple phases, including molecular, atomic, and ionized gas, as well as dust. Stars are formed within this medium from cold molecular gas clouds, which collapse due to their gravitational attraction ...
Jonathan Freundlich
doaj   +1 more source

Atomic Gas in Debris Discs [PDF]

, 2016
We have conducted a search for optical circumstellar absorption lines in the spectra of 16 debris disc host stars. None of the stars in our sample showed signs of emission line activity in either H$_{\alpha}$, Ca II or Na I, confirming their more evolved
Barlow, M. J., Casassus, S., Crawford, I. A., Hales, Antonio S.   +3 more
core   +2 more sources

Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight

Experimental Physiology, EarlyView.
Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley   +1 more source

The Local Group L-band Survey: The First Measurements of Localized Cold Neutral Medium Properties in the Low-metallicity Dwarf Galaxy NGC 6822

The Astrophysical Journal
Measuring the properties of the cold neutral medium (CNM) in low-metallicity galaxies provides insights into heating and cooling mechanisms in early Universe-like environments.
Nickolas M. Pingel, Hongxing Chen, Snežana Stanimirović, Eric W. Koch, Adam K. Leroy, Erik Rosolowsky, Chang-Goo Kim, Julianne J. Dalcanton, Fabian Walter, Michael P. Busch, Ryan Chown, Jennifer Donovan Meyer, Cosima Eibensteiner, Deidre A. Hunter, Sumit K. Sarbadhicary, Elizabeth Tarantino, Vicente Villanueva, Thomas G. Williams   +17 more
doaj   +1 more source

Mapping the interstellar medium in galaxies with Herschel/SPIRE [PDF]

, 2010
The standard method of mapping the interstellar medium in a galaxy, by observing the molecular gas in the CO 1-0 line and the atomic gas in the 21-cm line, is largely limited with current telescopes to galaxies in the nearby universe.
Bock, J. J., Bradford, M., Eales, S. A., Levenson, L. R., Schulz, B.   +4 more
core  

Magnetic Misalignment of Interstellar Dust Filaments

The Astrophysical Journal, 2023
We present evidence for scale-independent misalignment of interstellar dust filaments and magnetic fields. We estimate the misalignment by comparing millimeter-wave dust-polarization measurements from Planck with filamentary structures identified in ...
Ari J. Cukierman, S. E. Clark, George Halal   +2 more
doaj   +1 more source

Interstellar gas within $\sim 10$ pc of Sgr A$^*$

, 2012
We seek to obtain a coherent and realistic three-dimensional picture of the interstellar gas out to about 10 pc of the dynamical center of our Galaxy, which is supposed to be at Sgr A$^*$.
Aitken, Amo-Baladrón, Amo-Baladrón, Baganoff, Beckert, Becklin, Blum, Bradford, Brown, Burton, Christopher, Coil, Coil, Davidson, Dent, Depoy, Ekers, Ekers, Gatley, Gatley, Geballe, Genzel, Genzel, Güsten, Güsten, Güsten, Hall, Harris, Herbst, Herrnstein, Herrnstein, Jackson, Jones, K. Ferrière, Karlsson, Koyama, Krabbe, Krabbe, Lacy, Lacy, Lacy, Latvakoski, Lee, Lee, Lis, Liszt, Liszt, Liszt, Lo, Lutz, Maeda, Marr, Marshall, McGary, Melia, Mezger, Mezger, Montero-Castaño, Morris, Morris, Mužić, Oka, Okumura, Okumura, Park, Park, Paumard, Paumard, Pedlar, Poglitsch, Reid, Roberts, Roberts, Rockefeller, Sakano, Sanders, Sandqvist, Sandqvist, Schwarz, Schödel, Schödel, Serabyn, Serabyn, Serabyn, Serabyn, Serabyn, Shukla, Sjouwerman, Solomon, Sutton, Telesco, Trippe, Tsuboi, Tsuboi, Tsuboi, Viehmann, Vollmer, Wardle, Whiteoak, Wright, Wright, Yuan, Yusef-Zadeh, Yusef-Zadeh, Yusef-Zadeh, Yusef-Zadeh, Yusef-Zadeh, Yusef-Zadeh, Yusef-Zadeh, Yusef-Zadeh, Yusef-Zadeh, Yusef-Zadeh, Yusef-Zadeh, Zhao, Zhao, Zylka, Zylka   +116 more
core   +1 more source

Tautomerization Kinetics of Thiouracils at Low Temperatures Driven Solely by Quantum‐Mechanical Tunnelling: Predictions of Suitable Candidates for Future Experiments

International Journal of Chemical Kinetics, Volume 58, Issue 6, Page 269-277, June 2026.
ABSTRACT In the past two decades numerous experiments have been conducted on the kinetics of reactions occurring at low temperatures on inert matrices. In particular, unimolecular proton‐transfer photo‐reactions of compounds containing a carbon–sulfur double bond, or thione group C═S, can lead to the formation of higher energy isomers or tautomers with
Judith Wurmel, John M. Simmie
wiley   +1 more source