Article thumbnail

Origin of Radially Increasing Stellar Scaleheight in a Galactic Disk

By Chaitra A Narayan and Chanda J Jog

Abstract

For the past twenty years, it has been accepted that the vertical scaleheight of the stellar disk in spiral galaxies is constant with radius. However, there is no clear physical explanation for this in the literature. Here we calculate the vertical stellar scaleheight for a self-gravitating stellar disk including the additional gravitational force of the HI and H_2 gas and the dark matter halo. We apply our model to two edge-on galaxies, NGC 891 and NGC 4565, and find that the resulting scaleheight shows a linear increase of nearly a factor of two within the optical disk for both these galaxies. Interestingly, we show that the observed data when looked at closely, do not imply a constant scaleheight but actually support this moderate flaring in scaleheight

Topics: Physics
Year: 2002
OAI identifier: oai:eprints.iisc.ac.in:784
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://eprints.iisc.ac.in/784/... (external link)
  • http://eprints.iisc.ac.in/784/ (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.