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The Collisions of HVCs with a Magnetized Gaseous Disk

Published online by Cambridge University Press:  04 August 2010

Alfredo Santillán
Affiliation:
Instituto de Astronomía–UNAM, Apdo. Postal 70–264, 04510 México, D.F., México, Cómputo Aplicado, DGSCA–UNAM, Apdo. Postal 20–059, 04510 México, D.F., México
Jose Franco
Affiliation:
Instituto de Astronomía–UNAM, Apdo. Postal 70–264, 04510 México, D.F., México
Marco Martos
Affiliation:
Instituto de Astronomía–UNAM, Apdo. Postal 70–264, 04510 México, D.F., México
Jose Franco
Affiliation:
Universidad Nacional Autónoma de México
Alberto Carraminana
Affiliation:
Instituto Nacional de Astrofisica, Optica y Electronica, Tonantzintla, Mexico
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Summary

We present two-dimensional MHD numerical simulations for the interaction of high-velocity clouds (HVC) with a magnetized gaseous disk. The initial magnetic field is oriented parallel to the disk. The impinging clouds move in oblique trajectories and fall toward the disk with different initial velocities. The B-field lines are distorted and compressed during the collision, increasing the field tension and preventing the cloud material from penetrating into the disk. The perturbation, however, creates a complex, turbulent, pattern of MHD waves that are able to traverse the galactic disk and, for unstable disks, can trigger the Parker instability.

Introduction

High velocity clouds (HVC) are atomic H I clouds located at high latitudes in our Galaxy, and moving at velocities ∣VLSR∣≥ 90 km/s (see Bajaja et al. 1985, and Wakker & van Woerden 1997). Their distance is unknown, but limits to the locations of some particular clouds indicate z-heigths of a few kiloparsecs, setting a possible mass range of 105-106 M. Thus, a HVC complex moving with a speed of 100 km/s has a kinetic energy of about 1052−53 erg. These values indicate that the bulk motion of the HVC system could represent a rich source of energy and momentum for the interstellar medium (equivalent to that from several generations of superbubbles).

There is evidence for possible collisions between HVCs and gaseous disks, both in our Galaxy and in external galaxies.

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Publisher: Cambridge University Press
Print publication year: 1999

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  • The Collisions of HVCs with a Magnetized Gaseous Disk
    • By Alfredo Santillán, Instituto de Astronomía–UNAM, Apdo. Postal 70–264, 04510 México, D.F., México, Cómputo Aplicado, DGSCA–UNAM, Apdo. Postal 20–059, 04510 México, D.F., México, Jose Franco, Instituto de Astronomía–UNAM, Apdo. Postal 70–264, 04510 México, D.F., México, Marco Martos, Instituto de Astronomía–UNAM, Apdo. Postal 70–264, 04510 México, D.F., México
  • Edited by Jose Franco, Universidad Nacional Autónoma de México, Alberto Carraminana, Instituto Nacional de Astrofisica, Optica y Electronica, Tonantzintla, Mexico
  • Book: Interstellar Turbulence
  • Online publication: 04 August 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564666.027
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  • The Collisions of HVCs with a Magnetized Gaseous Disk
    • By Alfredo Santillán, Instituto de Astronomía–UNAM, Apdo. Postal 70–264, 04510 México, D.F., México, Cómputo Aplicado, DGSCA–UNAM, Apdo. Postal 20–059, 04510 México, D.F., México, Jose Franco, Instituto de Astronomía–UNAM, Apdo. Postal 70–264, 04510 México, D.F., México, Marco Martos, Instituto de Astronomía–UNAM, Apdo. Postal 70–264, 04510 México, D.F., México
  • Edited by Jose Franco, Universidad Nacional Autónoma de México, Alberto Carraminana, Instituto Nacional de Astrofisica, Optica y Electronica, Tonantzintla, Mexico
  • Book: Interstellar Turbulence
  • Online publication: 04 August 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564666.027
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • The Collisions of HVCs with a Magnetized Gaseous Disk
    • By Alfredo Santillán, Instituto de Astronomía–UNAM, Apdo. Postal 70–264, 04510 México, D.F., México, Cómputo Aplicado, DGSCA–UNAM, Apdo. Postal 20–059, 04510 México, D.F., México, Jose Franco, Instituto de Astronomía–UNAM, Apdo. Postal 70–264, 04510 México, D.F., México, Marco Martos, Instituto de Astronomía–UNAM, Apdo. Postal 70–264, 04510 México, D.F., México
  • Edited by Jose Franco, Universidad Nacional Autónoma de México, Alberto Carraminana, Instituto Nacional de Astrofisica, Optica y Electronica, Tonantzintla, Mexico
  • Book: Interstellar Turbulence
  • Online publication: 04 August 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564666.027
Available formats
×