Results 1 to 10 of about 889,569 (256)

Efficient stabilization of cyanonaphthalene by fast radiative cooling and implications for the resilience of small PAHs in interstellar clouds. [PDF]

Nat Commun, 2023
After decades of searching, astronomers have recently identified specific Polycyclic Aromatic Hydrocarbons (PAHs) in space. Remarkably, the observed abundance of cyanonaphthalene (CNN, C_10H_7CN) in the Taurus Molecular Cloud (TMC-1) is six orders of ...
Stockett MH, Bull JN, Cederquist H, Indrajith S, Ji M, Navarro Navarrete JE, Schmidt HT, Zettergren H, Zhu B.   +8 more
europepmc   +2 more sources

Isomer-specific kinetics of the C⁺ + H₂O reaction at the temperature of interstellar clouds. [PDF]

Sci Adv, 2021
An important interstellar hydrocarbon chemical reaction has been measured in a laboratory. The reaction C+ + H2O → HCO+/HOC+ + H is one of the most important astrophysical sources of HOC+ ions, considered a marker for interstellar molecular clouds ...
Yang T, Li A, Chen GK, Yao Q, Suits AG, Guo H, Hudson ER, Campbell WC.   +7 more
europepmc   +2 more sources

Inhomogeneity within Local Interstellar Clouds [PDF]

The Astronomical Journal, 2022
Analysis of interstellar absorption lines observed in high-resolution Hubble Space Telescope spectra of nearby stars provides temperatures, turbulent velocities, and kinetic properties of warm interstellar clouds.
J. Linsky, S. Redfield, Diana Ryder, Adina Chasan-Taber   +3 more
semanticscholar   +3 more sources

Elemental nitrogen partitioning in dense interstellar clouds. [PDF]

Proc Natl Acad Sci U S A, 2012
Many chemical models of dense interstellar clouds predict that the majority of gas-phase elemental nitrogen should be present as N2, with an abundance approximately five orders of magnitude less than that of hydrogen.
Daranlot J, Hincelin U, Bergeat A, Costes M, Loison JC, Wakelam V, Hickson KM.   +6 more
europepmc   +3 more sources

Modeling sulfur depletion in interstellar clouds [PDF]

Astronomy & Astrophysics, 2019
Context. The elemental depletion of interstellar sulfur from the gas phase has been a recurring challenge for astrochemical models. Observations show that sulfur remains relatively non-depleted with respect to its cosmic value throughout the diffuse and ...
J. Laas, P. Caselli
semanticscholar   +5 more sources

Organic molecules in translucent interstellar clouds. [PDF]

Orig Life Evol Biosph, 2014
Absorption spectra of translucent interstellar clouds contain many known molecular bands of CN, CH+, CH, OH, OH(+), NH, C2 and C3. Moreover, one can observe more than 400 unidentified absorption features, known as diffuse interstellar bands (DIBs), commonly believed to be carried by complex, carbon-bearing molecules.
Krełowski J.
europepmc   +4 more sources

Boron Abundances in Diffuse Interstellar Clouds [PDF]

Proceedings of the International Astronomical Union, 2009
We present a comprehensive survey of B abundances in diffuse interstellar clouds from HST/STIS observations along 56 Galactic sight lines. Our sample is the result of a complete search of archival STIS data for the B II resonance line at 1362 angstroms ...
Adam M. Ritchey, D. L. Lambert, Knauth, Meneguzzi, S. R. Federman, Y. Sheffer   +5 more
core   +2 more sources

Interstellar clouds containing optically thin H2

The Astrophysical Journal, 1975
The theory of Black and Delgarno that the relative populations of the excited rotational levels of H2 can be understood in terms of cascading following absorption in the Lyman and Werner bands is employed to infer the gas densities and radiation fields within diffuse interstellar clouds containing H2 that is optically thin in those bands.
M. Jura
semanticscholar   +2 more sources

Mixing Interstellar Clouds Surrounding the Sun [PDF]

Astrophysical Journal Letters, 2022
On its journey through the Galaxy, the Sun passes through diverse regions of the interstellar medium. High-resolution spectroscopic measurements of interstellar absorption lines in spectra of nearby stars show absorption components from more than a dozen
P. Swaczyna, N. Schwadron, E. Mobius, M. Bzowski, P. Frisch, J. Linsky, D. McComas, F. Rahmanifard, S. Redfield, R. Winslow, B. Wood, G. Sciences, P. University., Princeton, Nj, Usa, S. Center, University of New Hampshire, Durham, Nh, Space Research Centre Pas, Warsaw, Poland., D. O. Astronomy, Astrophysics, U. Chicago, Chicago., Il, Jila, U. Colorado, Nist, Boulder, Co., Van Vleck Observatory, Wesleyan University, Middletown, Čt, Space Science Division, Naval Reserach Laboratory, Washington, Dc, Department of Materials Science, University of Alabama in Huntsville, Al.   +43 more
semanticscholar   +1 more source

CaFe interstellar clouds [PDF]

Monthly Notices of the Royal Astronomical Society, 2007
A new kind of interstellar cloud is proposed. These are rare (just a few examples among ∼300 lines of sight) objects with the Ca I 4227-Å, Fe I 3720-Å and 3860-Å lines stronger than those of K I (near 7699 Å) and Na I (near 3302 Å). We propose the name ‘CaFe’ for these clouds.
A. Bondar, M. Kozak, P. Gnaciński, G. A. Galazutdinov, Y. Beletsky, J. Krełowski   +5 more
  +4 more sources