The Vertical Structure of the Outer Milky Way HI Disk

Details The Vertical Structure of the Outer Milky Way HI Disk The Vertical Structure of the Outer Milky Way HI Disk

2006-01-30

arxiv.org/abs/astro-ph/0601697v1

Astrophys.J. 643 (2006) 881-896

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ. 17 pages, 18 figures. Color maps are available at http://astron.berkeley.edu/~elevine

Scientific paper

10.1086/503091

We examine the outer Galactic HI disk for deviations from the b=0 plane by constructing maps of disk surface density, mean height, and thickness. We find that the Galactic warp is well described by a vertical offset plus two Fourier modes of frequency 1 and 2, all of which grow with Galactocentric radius. Adding the m=2 mode accounts for the large asymmetry between the northern and southern warps. We use a Morlet wavelet transform to investigate the spatial and frequency localization of higher frequency modes; these modes are often referred to as "scalloping." We find that the m=10 and 15 scalloping modes are well above the noise, but localized; this suggests that the scalloping does not pervade the whole disk, but only local regions.

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