The Extraordinary `Superthin' Spiral Galaxy UGC7321. II. The Vertical Disk Structure

Details The Extraordinary `Superthin' Spiral Galaxy UGC7321. II. The Vertical Disk Structure The Extraordinary `Superthin' Spiral Galaxy UGC7321. II. The Vertical Disk Structure

2000-06-28

arxiv.org/abs/astro-ph/0006412v1

Astronomy and Astrophysics

Astrophysics

Accepted to the Astronomical Journal; 27 pages, 12 figures, 2 tables; Fig. 12 is in color

Scientific paper

10.1086/301555

We explore the vertical light distribution as a function of galactocentric radius in the edge-on (i=88) Sd `superthin' galaxy UGC7321. UGC7321 is a low-luminosity spiral (M_B,i=-17.0) with a diffuse, low surface brightness stellar disk and no discernible bulge component. Within 0.25' (725 pc) of the disk center the global luminosity profile of UGC7321 can be reasonably characterized by an exponential function with a scale height h_z=2.9" (140 pc) in H and h_z=3.1" (150 pc) in R, making this among the thinnest galaxy disks know. Near the disk center we derive a ratio of disk scale length to global disk scale height h_r/h_z=14 in both H and R; near the edge of the disk, h_r/h_z=10. At intermediate galactocentric radii (0.25'

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