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Title: Vertical scaleheights of stars and gas in the galaxy
Authors: Narayan, C. A
Jog, C. J
Keywords: Vertical Scaleheights;Gas in the Galaxy;Galactocentric Radius
Issue Date: Sep-2002
Publisher: Astronomical Society of India
Citation: BASI, Vol. 30, No. 3, pp. 703 - 704
Abstract: The vertical scaleheight of atomic hydrogen gas is observed to be nearly constant with radius in the inner Galaxy « 8.5 kpc). This has been a long-standing puzzle (Oort 1962) because the gas scaleheight should increase exponentially with radius as a response to the decreasing gravitational potential of the stellar disk alone. We treat the stars, H I and H2 as three gravitationally coupled components in the Galactic disk and find their scaleheights as a function of galactocentric radius. This approach not only explains the near-constancy of H I scaleheight but also reproduces the observed scaleheight variation for H2 and stars in the Galaxy.
Appears in Collections:BASI Publications

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