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Origin of radially increasing stellar scaleheight in a galactic disk

Narayan, CA and Jog, CJ (2002) Origin of radially increasing stellar scaleheight in a galactic disk. In: Astronomy and Astrophysics, 390 (3). L35-L38.

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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.

Item Type: Journal Article
Keywords: galaxies: fundamental parameters -- galaxies: individual: NGC 891, NGC 4565 -- galaxies: kinematics and dynamics -- galaxies: photometry -- galaxies: spiral -- galaxies: structure
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Sanjo Jose
Date Deposited: 06 Jun 2007
Last Modified: 19 Sep 2010 04:38
URI: http://eprints.iisc.ac.in/id/eprint/11163

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