Results 61 to 70 of about 834,499 (261)

Strength Ratios of Diffuse Interstellar Bands in Slightly Reddened Objects

Universe
The disk of the Milky Way fills the interstellar medium in the form of discrete clouds, many (∼30) light-years across. The average density of this medium is 1 hydrogen atom per cm3 (Oort limit), in the clouds—several dozen atoms, and between the clouds ...
Jacek Krełowski, Arkadii Bondar
doaj   +1 more source

Kinetics and Thermodynamics of Tautomerization Reactions of 1,1‐ and 1,2‐Ethenediols

International Journal of Chemical Kinetics, Volume 57, Issue 12, Page 687-696, December 2025.
ABSTRACT Tautomerism is a common phenomenon amongst organic molecules with easily interconvertible isomers, which can impact drug action and toxicity. Here we are interested in the enols of carboxylic acids, which are known to be much less stable than their acid counterparts.
Judith Würmel, John M. Simmie
wiley   +1 more source

THE IMPLICATIONS OF A HIGH COSMIC-RAY IONIZATION RATE IN DIFFUSE INTERSTELLAR CLOUDS [PDF]

, 2009
Diffuse interstellar clouds show large abundances of H+3 which can only be maintained by a high ionization rate of H2. Cosmic rays are the dominant ionization mechanism in this environment, so the large ionization rate implies a high cosmic-ray flux, and
N. Indriolo, Brian D. Fields, B. J. McCall   +2 more
semanticscholar   +1 more source

Modeling the Optical Colors of Galactic Cirrus Clouds in the Stripe 82 Region

The Astronomical Journal
Observations have shown that the optical colors of Galactic cirrus clouds differ significantly from those of extragalactic sources; thus, they can be used to distinguish Galactic cirrus from extragalactic low surface brightness (LSB) features.
Kwang-Il Seon, Jongwan Ko, Woowon Byun, Jaehyun Lee, Young-Soo Jo   +4 more
doaj   +1 more source

Physical Properties of Giant Molecular Clouds in the Large Magellanic Cloud [PDF]

, 2010
The Magellanic Mopra Assessment (MAGMA) is a high angular resolution CO mapping survey of giant molecular clouds (GMCs) in the Large and Small Magellanic Clouds using the Mopra Telescope. Here we report on the basic physical properties of 125 GMCs in the
A. Hughes, A. Kawamura, Akritas, Alves, Babu, Ballesteros-Paredes, Ballesteros-Paredes, Bergin, Bernard, Blanc, Blitz, Blitz, Blitz, Blitz, Bolatto, Bolatto, Boulanger, Chieze, Chin, Cole, D. Paradis, Dickey, Dickman, Dobashi, E. Muller, Elmegreen, Federman, Fleck, Fukui, Garay, Gaustad, Hartmann, Heikkilä, Heyer, Heyer, Heyer, Israel, Israel, Israel, Israel, J. L. Pineda, J. Ott, J.-P. Bernard, Johansson, Kawamura, Kelly, Kim, Kim, Krumholz, Krumholz, Kutner, L. Staveley-Smith, Ladd, Larson, Larson, Lequeux, Leroy, Leroy, Leroy, Luks, M. Meixner, Mac Low, MacLaren, Maloney, Marx-Zimmer, McKee, Meixner, Minamidani, Miville-Deschênes, Mizuno, Moorey, Muller, N. Mizuno, Nikolaev, Nikolaev, Ott, Paradis, Pineda, Pineda, Press, Rosolowsky, Rosolowsky, Rosolowsky, Rosolowsky, S. Kim, S. Maddison, Sault, Skrutskie, Solomon, Sorai, Staveley-Smith, Strong, T. Onishi, T. Wong, Tasker, Tremaine, Van Der Marel, Van Dishoeck, W. T. Reach, Walter, Williams, Williams, Wilson, Wolfire, Wong, Wong, Y. Fukui, Y. Mizuno, Yang, Zhao   +109 more
core   +3 more sources

THE TEMPERATURE OF INTERSTELLAR CLOUDS FROM TURBULENT HEATING [PDF]

, 2008
To evaluate the effect of turbulent heating in the thermal balance of interstellar clouds, we develop an extension of the log-Poisson intermittency model to supersonic turbulence.
Liubin Pan, P. Padoan
semanticscholar   +1 more source

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

Mapping Galactic Dust Emission and Extinction with H I, H II, and H2

The Astrophysical Journal
Neutral hydrogen (H i ) emission closely traces the dust column density at high Galactic latitudes and is thus a powerful tool for predicting dust extinction. However, the relation between H i column density N _HI and high-latitude dust emission observed
Yun-Ting Cheng, Brandon S. Hensley, Tzu-Ching Chang, Olivier Doré   +3 more
doaj   +1 more source

Turbulence in the interstellar medium [PDF]

Nonlinear Processes in Geophysics, 2014
Turbulence is ubiquitous in the insterstellar medium and plays a major role in several processes such as the formation of dense structures and stars, the stability of molecular clouds, the amplification of magnetic fields, and the re-acceleration and ...
D. Falceta-Gonçalves, G. Kowal, E. Falgarone, A. C.-L. Chian   +3 more
doaj   +1 more source

Aditional Ultra-High-Resolution Observations of Ca+ Ions in the Local Insterstellar Medium [PDF]

, 1998
We present ultra-high-resolution (0.35 km s−1 FWHM) observations of the interstellar Ca K line towards seven nearby stars. The spectral resolution was sufficient to resolve the line profiles fully, thereby enabling us to detect hitherto unresolved ...
Crawford, IA, Lallement, R, Welsh, BY
core