FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2019413678> ?p ?o ?g. }

• W2019413678 abstract "We propose that galactic shocks propagating through interstellar density fluctuations provide a mechanism for the intermittent replenishment, or pumping, of the supersonic motions and internal density enhancements observed pervasively within cool atomic and molecular interstellar structures, without necessarily requiring the presence of self-gravity, magnetic fields, or young stars. The shocks are assumed to be due to a variety of galactic sources on a range of scales. An analytic result for the kinematic vorticity generated by a shock passing through a radially stratified two-dimensional isobaric model cloud is derived, assuming that the Mach number is not so large that the cloud is disrupted, and neglecting the shock curvature and cloud distortion. Two-dimensional lattice gas hydrodynamic simulations at modest Mach numbers were used to verify the analytic result. The induced internal velocities are initially a significant fraction of the shock speed divided by the square root of the density contrast, accounting for both the observed line width amplitudes and the apparent cloud-to-cloud line width-density scaling. The line width-size relation could then be interpreted in terms of the well-known power spectrum of a system of shocks. The induced vortical energy should quickly be converted to compressible and MHD modes and so would be difficult to observe directly, even though it would still be the power source for the other modes. The shock pump thus produces density structure without the necessity of any sort of instability. We argue that the shock pump should lead to nested shock-induced structures, providing a cascade mechanism for supersonic turbulence and a physical explanation for the fractal-like structure of the cool interstellar medium. The average time between shock exposures for an idealized cloud in our Galaxy is estimated and found to be small enough that the shock pump is capable of sustaining the supersonic motions against readjustment and dissipation, except for the smallest structures. This suggests an explanation of the roughly spatially uniform and nearly sonic line widths in small dense cores. We speculate that the avoidance of shock pumping may be necessary for a localized region to form stars and that the inverse dependence of probability of avoidance on region size may be an important factor in determining the stellar initial mass function." @default.
• W2019413678 created "2016-06-24" @default.
• W2019413678 creator A5030005903 @default.
• W2019413678 creator A5042338563 @default.
• W2019413678 date "2000-03-01" @default.
• W2019413678 modified "2023-09-26" @default.
• W2019413678 title "The Galactic Shock Pump: A Source of Supersonic Internal Motions in the Cool Interstellar Medium" @default.
• W2019413678 cites W137464264 @default.
• W2019413678 cites W1509420341 @default.
• W2019413678 cites W1585774805 @default.
• W2019413678 cites W1596804503 @default.
• W2019413678 cites W1670106355 @default.
• W2019413678 cites W1964952569 @default.
• W2019413678 cites W1968137411 @default.
• W2019413678 cites W1968609336 @default.
• W2019413678 cites W1969955094 @default.
• W2019413678 cites W1970766685 @default.
• W2019413678 cites W1976900413 @default.
• W2019413678 cites W1977467231 @default.
• W2019413678 cites W1982723575 @default.
• W2019413678 cites W1982727463 @default.
• W2019413678 cites W1986709613 @default.
• W2019413678 cites W1987245508 @default.
• W2019413678 cites W1996162605 @default.
• W2019413678 cites W1998168370 @default.
• W2019413678 cites W2004338651 @default.
• W2019413678 cites W2005275746 @default.
• W2019413678 cites W2008783600 @default.
• W2019413678 cites W2009042283 @default.
• W2019413678 cites W2010580468 @default.
• W2019413678 cites W2012220297 @default.
• W2019413678 cites W2012436135 @default.
• W2019413678 cites W2012836097 @default.
• W2019413678 cites W2014334967 @default.
• W2019413678 cites W2014728503 @default.
• W2019413678 cites W2014881373 @default.
• W2019413678 cites W2015865430 @default.
• W2019413678 cites W2025883417 @default.
• W2019413678 cites W2026823113 @default.
• W2019413678 cites W2028984024 @default.
• W2019413678 cites W2031916992 @default.
• W2019413678 cites W2032072360 @default.
• W2019413678 cites W2035128754 @default.
• W2019413678 cites W2035172927 @default.
• W2019413678 cites W2037068907 @default.
• W2019413678 cites W2040697424 @default.
• W2019413678 cites W2040869637 @default.
• W2019413678 cites W2041603976 @default.
• W2019413678 cites W2042600720 @default.
• W2019413678 cites W2044224449 @default.
• W2019413678 cites W2044712651 @default.
• W2019413678 cites W2057147077 @default.
• W2019413678 cites W2058815525 @default.
• W2019413678 cites W2059616888 @default.
• W2019413678 cites W2061812541 @default.
• W2019413678 cites W2061828089 @default.
• W2019413678 cites W2062272820 @default.
• W2019413678 cites W2062592792 @default.
• W2019413678 cites W2070157013 @default.
• W2019413678 cites W2074324846 @default.
• W2019413678 cites W2075057122 @default.
• W2019413678 cites W2075123673 @default.
• W2019413678 cites W2078121739 @default.
• W2019413678 cites W2081853675 @default.
• W2019413678 cites W2082092783 @default.
• W2019413678 cites W2085624518 @default.
• W2019413678 cites W2089176910 @default.
• W2019413678 cites W2089234723 @default.
• W2019413678 cites W2093270325 @default.
• W2019413678 cites W2098986009 @default.
• W2019413678 cites W2102402402 @default.
• W2019413678 cites W2105987454 @default.
• W2019413678 cites W2108619446 @default.
• W2019413678 cites W2130582257 @default.
• W2019413678 cites W2135427074 @default.
• W2019413678 cites W2145262026 @default.
• W2019413678 cites W2157142026 @default.
• W2019413678 cites W2317211897 @default.
• W2019413678 cites W2570894834 @default.
• W2019413678 cites W3021423592 @default.
• W2019413678 cites W3103558862 @default.
• W2019413678 cites W3104026053 @default.
• W2019413678 cites W3104817366 @default.
• W2019413678 cites W4229937038 @default.
• W2019413678 cites W4255730322 @default.
• W2019413678 doi "https://doi.org/10.1086/308425" @default.
• W2019413678 hasPublicationYear "2000" @default.
• W2019413678 type Work @default.
• W2019413678 sameAs 2019413678 @default.
• W2019413678 citedByCount "45" @default.
• W2019413678 countsByYear W20194136782013 @default.
• W2019413678 countsByYear W20194136782015 @default.
• W2019413678 countsByYear W20194136782016 @default.
• W2019413678 countsByYear W20194136782017 @default.
• W2019413678 countsByYear W20194136782018 @default.
• W2019413678 countsByYear W20194136782021 @default.
• W2019413678 crossrefType "journal-article" @default.
• W2019413678 hasAuthorship W2019413678A5030005903 @default.
• W2019413678 hasAuthorship W2019413678A5042338563 @default.
• W2019413678 hasBestOaLocation W20194136782 @default.

• next