# Flaring stellar disk in the low surface brightness galaxy UGC 7321

## TL;DR

This paper models the vertical structure of the low surface brightness galaxy UGC 7321, predicting disk flaring and thickness variations consistent with observations, and challenges the need for a double-disk model.

## Contribution

It provides a detailed theoretical analysis of the galaxy's vertical structure considering realistic rotation curves and dark matter halo effects, offering new insights into disk flaring without requiring a double-disk model.

## Key findings

- Disk thickness mildly increases up to 6 kpc and flares beyond.
- Stellar velocity dispersion must decrease exponentially for observed trend.
- Both stellar and HI disks show flaring in outer regions.

## Abstract

We theoretically study the vertical structure of the edge-on low surface brightness (LSB) galaxy UGC 7321. This is one of the few well-observed LSBs. We modeled it as a gravitationally coupled disk system of stars and atomic hydrogen gas in the potential of the dark matter halo and treated the realistic case where the rotation velocity varies with radius. We used a dense and compact halo as implied by the observed rotation curve in this model. We calculated the thickness of stellar and HI disks in terms of the half-width at half-maximum of the vertical density distribution in a region of R=0 to 12 kpc using input parameters constrained by observations. We obtain a mildly increasing disk thickness up to R=6 kpc, in a good agreement with the observed trend, and predict a strong flaring beyond this. To obtain this trend, the stellar velocity dispersion has to fall exponentially at a rate of 3.2R_D , while the standard value of 2R_D gives a decreasing thickness with radius. Interestingly, both stellar and HI disks show flaring in the outer disk region although they are dynamically dominated by the dark matter halo from the very inner radii. The resulting vertical stellar density distribution cannot be fit by a single sech^2/n function, in agreement with observations, which show wings at larger distances above the mid-plane. Invoking a double-disk model to explain the vertical structure of LSBs as done in the literature may therefore not be necessary.