Results 21 to 30 of about 54,240 (242)

Learning from model grids: Tracers of the ionization fraction in the ISM [PDF]

EPJ Web of Conferences, 2022
The ionization fraction in neutral interstellar clouds is a key physical parameter controlling multiple physical and chemical processes, and varying by orders of magnitude from the UV irradiated surface of the cloud to its cosmic-ray dominated central ...
Bron Emeric, Roueff Evelyne, Gerin Maryvonne, Pety Jérôme, Gratier Pierre, Le Petit Franck, Guzman Viviana, Orkisz Jan, de Souza Magalhaes Victor, Gaudel Mathilde, Palud Pierre, Einig Lucas, Bardeau Sébastien, Gerin Maryvonne, Chainais Pierre, Chanussot Jocelyn, Goicoechea Javier, Hughes Annie, Kainulainen Jouni, Languignon David, Le Bourlot Jacques, Levrier François, Lis Darek, Liszt Harvey, Öberg Karin, Peretto Nicolas, Roueff Antoine, Sievers Albrecht, Thouvenin Pierre-Antoine, Tremblin Pascal   +29 more
doaj   +1 more source

Evidence for the naphthalene cation in a region of the interstellar medium with anomalous microwave emission [PDF]

, 2008
We report high resolution spectroscopy of the moderately reddened (A$_V$=3) early type star Cernis 52 located in a region of the Perseus molecular cloud complex with anomalous microwave emission.
A. Manchado, Cernis, D. A. García-Hernández, D. L. Lambert, de Oliveira-Costa, de Oliveira-Costa, Deliyannis, Draine, Hobbs, Iglesias-Groth, J. I. González Hernández, Jenniskens, Krełowski, Kurucz, Leitch, Léger, Mattioda, Ricca, S. Iglesias-Groth, Sandford, Sbordone, Van der Zwet, Wagner, Watson, Watson   +24 more
core   +3 more sources

Interstellar hydrocarbons: degradation chemistry in diffuse clouds [PDF]

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT Observations of diffuse clouds showed that they contain a number of simple hydrocarbons [e.g. CH, C2H, (l- and c-)C3H2, and C4H] in abundances that may be difficult to understand on the basis of conventional gas-phase chemical models.
Zainab Awad, Serena Viti
openaire   +4 more sources

Turbulence in Interstellar Clouds [PDF]

International Astronomical Union Colloquium, 1989
Above masses of the order of lOO M⊙, molecular clouds have masses and sizes which scale like those of self-gravitating polytropes bounded by an external pervading pressure. It is unlikely that this scaling is due to mere observational bias. But the physics underlying this behaviour is far from being understood.
openaire   +1 more source

Dissociative Recombination of Rotationally Cold OH+ and Its Implications for the Cosmic Ray Ionization Rate in Diffuse Clouds

The Astrophysical Journal Letters, 2023
Observations of OH ^+ are used to infer the interstellar cosmic ray ionization rate in diffuse atomic clouds, thereby constraining the propagation of cosmic rays through and the shielding by interstellar clouds, as well as the low energy cosmic ray ...
Ábel Kálosi, Lisa Gamer, Manfred Grieser, Robert von Hahn, Leonard W. Isberner, Julia I. Jäger, Holger Kreckel, David A. Neufeld, Daniel Paul, Daniel W. Savin, Stefan Schippers, Viviane C. Schmidt, Andreas Wolf, Mark G. Wolfire, Oldřich Novotný   +14 more
doaj   +1 more source

SPITZER observations of dust destruction in the Puppis A supernova remnant [PDF]

, 2010
The interaction of the Puppis A supernova remnant (SNR) with a neighboring molecular cloud provides a unique opportunity to measure the amount of grain destruction in an SNR shock.
Arendt, Richard G., Blair, William P., Dwek, Eli, Ghavamian, Parviz, Hwang, Una, Long, Knox S., Petre, Robert, Rho, Jeonghee, Winkler, P. Frank   +8 more
core   +1 more source

Complex Reactive Acids from Methanol and Carbon Dioxide Ice: Glycolic Acid (HOCH2COOH) and Carbonic Acid Monomethyl Ester (CH3OCOOH)

The Astrophysical Journal, 2023
The formation of complex organic molecules by simulated secondary electrons generated in the track of galactic cosmic rays was investigated in interstellar ice analogs composed of methanol and carbon dioxide.
Joshua H. Marks, Jia Wang, Mikhail M. Evseev, Oleg V. Kuznetsov, Ivan O. Antonov, Ralf I. Kaiser   +5 more
doaj   +1 more source

Technology requirements of exploration beyond Neptune by solar sail propulsion [PDF]

, 2010
This paper provides a set of requirements for the technology development of a solar sail propelled Interstellar Heliopause Probe mission. The mission is placed in the context of other outer solar systems missions, ranging from a Kuiper Belt mission ...
Axford W. I., Bilbro J. W., Colasurdo G., Colin McInnes, Dachwald B., Dachwald B., Fiehler D. I., Gareth Hughes, Herbeck L., Herbeck L., Kawaguchi J., Leipold M., Lichodziejewshi D., Lyngvi A., Macdonald M., Malcolm Macdonald, Mann T., Matloff G. L., McEachen M. E., Murphy D. M., Rogan J., Sauer C., Sleight D. W., Sweetser T. H., Vulpetti G., Wertz J. R., West J. L., Williams D. R., Yen C. L., Young R. M., Zurbuchen T. H.   +30 more
core   +1 more source

CLOUD STRUCTURE OF INTERSTELLAR MATTER. OBSERVATIONAL PARAMETERS

Odessa Astronomical Publications, 2017
Parameters of 7600 HI clouds were determined on the base of HI RATAN-600 Survey in the second and third quadrants of galactic longitudes. The spectra of cloud linear diameters, HI densities and masses are obtained first for such huge population of clouds.
I. V. Gosachinskij, V. V. Morozova
doaj   +1 more source

Discovery of the Elusive Carbonic Acid (HOCOOH) in Space

The Astrophysical Journal, 2023
A quarter century after the detection of the last interstellar carboxylic acid, acetic acid (CH _3 COOH), we report the discovery of a new one, the cis-trans form of carbonic acid (HOCOOH), toward the Galactic center molecular cloud G+0.693–0.027. HOCOOH
Miguel Sanz-Novo, Víctor M. Rivilla, Izaskun Jiménez-Serra, Jesús Martín-Pintado, Laura Colzi, Shaoshan Zeng, Andrés Megías, Álvaro López-Gallifa, Antonio Martínez-Henares, Sarah Massalkhi, Belén Tercero, Pablo de Vicente, Sergio Martín, David San Andrés, Miguel A. Requena-Torres   +14 more
doaj   +1 more source