Results 91 to 100 of about 1,711 (227)

The Impact of External Gas Accretion on the Distribution of H I Gas in Galaxies

The Astrophysical Journal
Using the data from Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) and H i -MaNGA surveys, we build a sample of 37 gas–star misaligned galaxies with robust H i detections, which are believed to have undergone external gas accretion processes.
Qianhan Zhang, Min Bao, Yanmei Chen, Niankun Yu, Yong Shi, Luis C. Ho   +5 more
doaj   +1 more source

A Dynamic Interstellar Medium: Recent Numerical Simulations

, 2000
Recent numerical simulations of the interstellar medium driven by energy input from supernovae and stellar winds indicate that HI clouds can be formed by compression in shock waves and colliding turbulent streams without any help from thermal and gravitational instabilities.
openaire   +2 more sources

Revisiting a Chemical Route to the Formation of CN− in the Interstellar Medium

The Astrophysical Journal
We discuss the HCN + H ^− reaction as a path to the formation of CN ^− , the smallest cyanopolyyne anion observed in several interstellar environments.
Pablo del Mazo-Sevillano, Manuel Lara, E. Yurtsever, Mauro Satta, R. Wester, F. A. Gianturco   +5 more
doaj   +1 more source

Collisional dynamics of NC4NH+ with H2 in the interstellar medium [PDF]

Pooja Chahal, T. J. Dhilip Kumar
openalex   +1 more source

The properties of the star-forming interstellar medium atz = 0.84-2.23 from HiZELS: mapping the internal dynamics and metallicity gradients in high-redshift disc galaxies [PDF]

, 2012
A. M. Swinbank, David Sobral, Ian Smail, J. E. Geach, P. N. Best, Ian G. McCarthy, Robert A. Crain, Tom Theuns   +7 more
openalex   +1 more source

Detecting Dark Objects with Plasma Microlensing by Their Gravitational Wakes

The Astrophysical Journal
A moving mass makes a gravitational wake in the partially ionized interstellar medium, which acts as a lens for radio-frequency light. Consequently, plasma microlensing could complement gravitational microlensing in the search for invisible massive ...
M. Sten Delos
doaj   +1 more source

Star formation : Dynamical study of interstellar dust

, 2020
Le milieu interstellaire se compose, en masse, d'environ 1% de poussière. Paradoxalement,malgré sa faible concentration, celle-ci un rôle très important dans la formation stellaire. La dynamique des grains de poussière peut différer de celle du gaz, entrainant des variations locales de concentration.
openaire   +1 more source

Shear–Gravity Transition Determines the Steep Velocity Dispersion–Size Relation in Molecular Clouds: Confronting Analytical Formula with Observations

The Astrophysical Journal Letters
The velocity dispersion–size relation ( σ _v  ∼  R ^β ) is a crucial indicator of the dynamic properties of interstellar gas, where the slope is considered as β  ∼ 0.5. Recent observations reveal a steep velocity dispersion–size relation with the slope β
Yi-Heng Xie, Guang-Xing Li
doaj   +1 more source

Dynamical aspects of the interstellar medium

, 2002
Ce travail de thèse met en oeuvre la microphysique très riche du milieu interstellaire dans plusieurs problèmes hydrodynamiques à très haute résolution, tous associés à la formation des étoiles. La première partie du travail concerne le développement d'un modèle numérique monodimensionnel que nous avons appliqué à trois domaines différents.
openaire   +1 more source