Results 81 to 90 of about 668,448 (162)

Pressure and Star Formation in LITTLE THINGS Dwarf Irregular Galaxies

The Astrophysical Journal
The surface densities of star formation, Σ _SFR , in 24 dwarf irregular (dIrr) galaxies from the LITTLE THINGS survey are combined with gas surface densities and midplane pressures to examine the correlations found previously for spiral galaxies.
Bruce G. Elmegreen, Deidre A. Hunter, Edvige Corbelli   +2 more
doaj   +1 more source

Fractional abundances of molecules in dense interstellar clouds: A compendium of recent model results

, 2017
In this paper we present calculated fractional abundances in dense interstellar clouds for selected atomic and molecular species using three different homogeneous, pseudo-time-dependent models discussed by Bettens, Lee, & Herbst (1995): the new ...
R. P.A. Bettens, E. Herbst, H.-H. Lee
core   +1 more source

ACES: The Magnetic Field in Large Filaments in the Galactic Center

The Astrophysical Journal
The Galactic center (GC) is an extreme region of the Milky Way that is host to a complex set of thermal and nonthermal structures. In particular, the GC contains high-density gas and dust that is collectively referred to as the Central Molecular Zone ...
Dylan M. Paré, Zi-Xuan Feng, Yue Hu, Maya A. Petkova, Jack Sullivan, Robin G. Tress, Cara Battersby, Janik Karoly, Alex Lazarian, Dani Lipman, Xing Pan, Marco Donati, Mattia C. Sormani, John Bally, Ashley T. Barnes, Natalie O. Butterfield, Laura Colzi, Christoph Federrath, Pablo Garcia, Adam Ginsburg, Savannah R. Gramze, Anika Schmiedeke, Christian Henkel, Jonathan D. Henshaw, Paul T. Ho, Pei-Ying Hsieh, Izaskun Jimenez-Serra, Ralf S. Klessen, J. M. Diederik Kruijssen, Steven N. Longmore, Xing Lu, Elisabeth A.C. Mills, Álvaro Sánchez-Monge, Daniel L. Walker, Jennifer Wallace, Qizhou Zhang   +35 more
doaj   +1 more source

High-sensitivity Molecular Line Observations toward the L1544 Prestellar Core Challenge Current Models

The Astrophysical Journal
The increased sensitivity and spectral resolution of observed spectra toward the prestellar core L1544 are challenging the current physical and chemical models.
J. Ferrer Asensio, S. S. Jensen, S. Spezzano, P. Caselli, F. O. Alves, O. Sipilä, E. Redaelli   +6 more
doaj   +1 more source

Molecular and Solid Hydrogen in Dense Interstellar Clouds

The Astrophysical Journal, 1969
Molecular and solid hydrogen in dense interstellar clouds suggested from underabundance of neutral atomic hydrogen, discussing grain ...
P. M. Solomon, N. C. Wickramasinghe
openaire   +1 more source

Cloud Formation by Supernova Implosion

The Astrophysical Journal
The deposition of energy and momentum by supernova explosions has been subject to numerous studies in the past few decades. However, while there has been some work that focused on the transition from the adiabatic to the radiative stage of a supernova ...
Leonard E. C. Romano, Manuel Behrendt, Andreas Burkert   +2 more
doaj   +1 more source

Molecule Formation in Cool, Dense Interstellar Clouds [PDF]

Symposium - International Astronomical Union, 1980
A discussion is given of the general processes and considerations that arise in attempting to understand molecular reactions in cool, dense interstellar clouds. Basic elements of the gas phase, “ion-molecule” scheme are given explicitly before surveying topics in which there is considerable current activity.
openaire   +1 more source

Molecular Hydrogen Formation via Vibrational Excitation of Partially Superhydrogenated Pyrenes

The Astrophysical Journal
While polycyclic aromatic hydrocarbons (PAHs) are now accepted to be abundant in interstellar space, the abundance and influence of superhydrogenated PAHs (HPAHs) in the interstellar medium (ISM) are still under investigation.
Frederik Doktor S. Simonsen, Rijutha Jaganathan, Julianna Palotás, Zeyuan Tang, Bjørk Hammer, Jos Oomens, Liv Hornekær   +6 more
doaj   +1 more source

The Effect of an Inert Solid Reservoir on Molecular Abundances in Dense Interstellar Clouds

Open Astronomy, 2012
The question, what is the role of freeze-out of chemical species in determining the molecular abundances in the interstellar gas is a matter of debate.
Kalvāns Juris, Shmeld Ivar
doaj   +1 more source

A mechanism for heating dense interstellar clouds

The Astrophysical Journal, 1977
The rate of rotation of an interstellar cloud tends to increase as it contracts. As differential rotation occurs within a cloud, magnetic field lines are bent and twisted. The deformation of the magnetic field lines produces hydromagnetic waves and leads to a damping of the rotation.
openaire   +1 more source