Gravity or turbulence? Velocity dispersion-size relation
نویسندگان
چکیده
منابع مشابه
Fish responses to flow velocity and turbulence in relation to size, sex and parasite load.
Riverine fish are subjected to heterogeneous flow velocities and turbulence and may use this to their advantage by selecting regions that balance energy expenditure for station holding while maximizing energy gain through feeding opportunities. This study investigated microhabitat selection by guppies Poecilia reticulata in terms of flow characteristics generated by hemisphere boulders in an op...
متن کاملThe Supernova Rate - Velocity dispersion Relation in the Interstellar Medium
We investigate with three-dimensional numerical simulations of supernova driven turbulence in the interstellar medium (ISM) the relationship between the velocity dispersion of the gas and the supernova rate and feedback efficiency. Our simulations aim to explore the constancy of the velocity dispersion profiles in the outer parts of galactic disk at ∼ 6 − 8 km s, and the transition to the starb...
متن کاملThe Infrared Diameter { Velocity Dispersion Relation for Elliptical Galaxies
Using single channel infrared photometry from the literature, a provisional K-band diameter{velocity dispersion relation for elliptical galaxies in the Coma and Virgo clusters is derived. The Coma cluster relation has 1.5 times lower scatter at K than in B or V. Excluding 4 outliers, the RMS scatter at K for 24 galaxies in Coma is only 4.8% in distance, close to the limit implied by the observa...
متن کاملThe AGN fraction – velocity dispersion relation in clusters of galaxies
Context. Some previous investigations have found that the fraction (fAGN ) of active galactic nuclei (AGNs) is lower in clusters than in the field. This can result from the suppression of galaxy-galaxy mergers in high-velocity dispersion (σv) clusters, if the formation and/or fueling of AGNs is directly related to the merging process. Aims. We investigate the existence of a relation between fAG...
متن کاملWhat Shapes the Structure of Molecular Clouds: Turbulence or Gravity?
We revisit the origin of Larson’s scaling relations, which describe the structure and kinematics of molecular clouds, based on recent observations and large-scale simulations of supersonic turbulence. Using dimensional analysis, we first show that the slopes in both linewidth–size and mass–size correlations observed on scales 0.1 − 50 pc can be explained by a simple conceptual theory of compres...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2010
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2010.17657.x