The Stars and Gas in Outer Parts of Galaxy Disks: Extended or Truncated, Flat or Warped?

P. C. van der Kruit*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

I review observations of truncations of stellar disks and models for their origin, compare observations of truncations in moderately inclined galaxies to those in edge-on systems and discuss the relation between truncations and H I-warps and their systematics and origin. Truncations are a common feature in edge-on stellar disks, but the relation of truncations in face-on to those in edge-on galaxies needs further clarification. The origin of truncations is most likely related to a maximum in the specific angular momentum in the material that formed the stellar disks, but this model does probably require some redistribution of angular momentum. H I-warps start just beyond the truncation radius and disks and warps appear distinct components. This suggests that inner disks form initially and settle as rigid, very flat structures, while H I-warps result from later infall of gas with a different orientation of the angular momentum.

Original languageEnglish
Title of host publicationFORMATION AND EVOLUTION OF GALAXY DISKS
EditorsJG Funes, EM Corsini
Place of PublicationSAN FRANCISCO
PublisherASTRONOMICAL SOC PACIFIC
Pages173-181
Number of pages9
ISBN (Print)978-1-58381-662-2
Publication statusPublished - 2008
EventInternational Conference on Formation and Evolution of Galaxy Disks - , Italy
Duration: 1-Oct-20075-Oct-2007

Publication series

NameASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES
PublisherASTRONOMICAL SOC PACIFIC
Volume396

Other

OtherInternational Conference on Formation and Evolution of Galaxy Disks
Country/TerritoryItaly
Period01/10/200705/10/2007

Keywords

  • ON SPIRAL GALAXIES
  • BAND SURFACE PHOTOMETRY
  • GALACTIC DISKS
  • 3-DIMENSIONAL DISTRIBUTION
  • STELLAR DISKS
  • DOMINATED GALAXIES
  • LIGHT
  • ROTATION
  • MASS

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