Results 51 to 60 of about 4,544,171 (395)

Evidence for a Molecular Cloud Origin for Gamma-Ray Bursts: Implications for the Nature of Star Formation in the Universe [PDF]

, 2001
It appears that the majority of rapidly-, well-localized gamma-ray bursts with undetected, or dark, optical afterglows, or `dark bursts' for short, occur in clouds of size R > 10L_{49}^{1/2} pc and mass M > 3x10^5L_{49} M_{sun}, where L is the isotropic ...
Dal Fiume D., Daniel E. Reichart, Joseph R. D., Noguchi M., Owens A., Paul A. Price, Wright G. S., Yonetoku D.   +7 more
core   +2 more sources

The simulation of molecular clouds formation in the Milky Way [PDF]

, 2012
Using 3D hydrodynamic calculations we simulate formation of molecular clouds in the Galaxy. The simulations take into account molecular hydrogen chemical kinetics, cooling and heating processes.
A. M. Sobolev, A. V. Khoperskov, Amores, Asplund, Baba, Bakes, Balbus, Ballesteros-Paredes, Barnes, Beaumont, Begeman, Bergin, Binney, Blitz, Bobylev, Cazaux, Cen, Chou, Cohen, Cox, Dame, Dame, Dobbs, Dobbs, Dobbs, Dobbs, Dobbs, Dobbs, Draine, E. O. Vasiliev, Elmegreen, Elmegreen, Elmegreen, Englmaier, Falgarone, Feldmann, Field, Fridman, Galli, Glover, Goldsmith, Habing, Heyer, Hollenbach, Hollenbach, Kalberla, Kauffmann, Khoperskov, Khoperskov, Kim, Kirsanova, Kwan, Lada, Lada, Larson, Lepine, Levine, Levinson, Mac Low, Maloney, McClure-Griffiths, McKee, Mishurov, Nelson, Rathborne, Roberts, Roberts, Rodriguez-Fernandez, Román-Duval, Román-Zúñiga, S. A. Khoperskov, Shetty, Shetty, Shu, Sofue, Solomon, Stecker, Sutherland, Tasker, Tielens, Tomisaka, Vallee, van Leer, Wada, Wada, Wada, Wada, Wolfire, Zhang   +88 more
core   +1 more source

Chemistry of Molecular Clouds [PDF]

International Astronomical Union Colloquium, 1989
AbstractA discussion is presented of the chemistry of quiescent molecular clouds, and the effects of the presence of polycyclic aromatic hydrocarbon molecules and of cosmic-ray induced ultraviolet photons are examined. A comparison is made with the chemistry occurring in molecular clouds that are subjected to shocks and the differences between ...
openaire   +2 more sources

Molecular Abundances in the Sgr a Molecular Cloud [PDF]

Symposium - International Astronomical Union, 1992
We have obtained column densities for HCO+, HCO, HCS+, C3H2, HC5N, SiO, OCS, HCOOH, CH3CH2 OH, and CH3CCH toward Sgr A. The fractional abundance of SiO relative to molecular hydrogen in Sgr A is comparable to that for the Orion plateau, ~ 10−7 − 10−8, which may be a typical value for hot clouds.
Yc Minh, William M. Irvine, Per Friberg
openaire   +2 more sources

ON THE THEORY OF THE OF-CENTRAL EXPLOSION IN A SPHERICALLY STRATIFIED MEDIUM

Radio Physics and Radio Astronomy, 2015
Аn analytical solution for a spherically stratified medium is constructed on the strength of an earlier obtained exact solution of Kompaneets equation for the shock front in a planar stratified medium with the density changing as the hyperbolic tangent ...
G. V. Donets
doaj   +1 more source

PHYSICAL PROPERTIES OF MOLECULAR CLOUDS FOR THE ENTIRE MILKY WAY DISK [PDF]

, 2016
This study presents a catalog of 8107 molecular clouds that covers the entire Galactic plane and includes 98% of the 12CO emission observed within . The catalog was produced using a hierarchical cluster identification method applied to the result of a ...
M. Miville-Deschênes, N. Murray, Eve J. Lee   +2 more
semanticscholar   +1 more source

Kinematic Distances to Molecular Clouds identified in the Galactic Ring Survey [PDF]

, 2009
Kinematic distances to 750 molecular clouds identified in the 13CO J=1-0 Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey (BU-FCRAO GRS) are derived assuming the Clemens rotation curve of the Galaxy.
Alexis Johnson, Anderson, Benjamin, Bergin, Beuther, Beuther, Blitz, Brunthaler, Burton, Cole, Drimmel, Dyson, Flynn, Freudenreich, Goldsmith, Goldsmith, Heitsch, Jackson, Jackson, James M. Jackson, Jill Rathborne, Julia Roman-Duval, Kerr, Kim, Kim, Kim, Kolpak, Lin, Liszt, Lynds, Mark Heyer, Mathis, Mouschovias, Rathborne, Rathborne, Rathborne, Rathborne, Robert Simon, Ronak Shah, Sodroski, Stil, Vazquez-Semadeni, Xu, Zhang   +43 more
core   +4 more sources

OBSERVATIONS OF NON TYPICAL MASERS AT THE RT-22 RADIO TELESCOPE IN 2004–2013

Radio Physics and Radio Astronomy, 2017
Purpose: Some peculiarities of emission of Class I methanol masers on the 80–71A+ transition at 95 GHz in sources closely associated with protostar-forming regions and in supernova remnants are studied.
V. M. Shulga, O. V. Antyufeyev, S. Y. Zubrin, V. V. Myshenko, V. I. Piddyachiy, A. M. Korolev, O. M. Patoka   +6 more
doaj   +1 more source

Molecular Clouds in the Galactic Plane from l = [59.°75, 74.°75] and b = [−5.°25, +5.°25]

The Astrophysical Journal Supplement Series, 2023
In this paper we present the distribution of molecular gas in the Milky Way Galactic plane from l = [59.75, 74.75]° and b = [−5.25, +5.25]°, using the MWISP ^12 CO/ ^13 CO/C ^18 O emission-line data.
Chunxue Li, Hongchi Wang, Yuehui Ma, Lianghao Lin, Yang Su, Chong Li, Yan Sun, Xin Zhou, Ji Yang   +8 more
doaj   +1 more source

Molecular clouds in M82

The Astrophysical Journal, 1984
CO observations of the peculiar galaxy M82 have been made at 79 positions using the 14 m FCRAO telescope (HPBW = 50'') in order to obtain a fully sampled map of the central 2 kpc as well as the radial distribution of molecular gas out to 3 kpc along the major axis.
Young, JS, SCOVILLE, NZ
openaire   +3 more sources