# Comment on the paper "Calorimetric Dark Matter Detection with Galactic Center Gas Clouds"

## TL;DR

This paper critiques a previous study on dark matter detection via galactic gas clouds, highlighting issues with cloud stability assumptions and parameter choices that affect the derived limits on dark matter interactions.

## Contribution

It challenges prior work by pointing out the instability of clouds in extreme environments and incorrect parameter usage, questioning the validity of the original limits on dark matter interactions.

## Key findings

- Galactic center gas clouds in extreme environments are likely unstable over relevant timescales.
- Previous limits on dark matter interactions based on these clouds may be unreliable due to stability issues.
- Incorrect cloud parameters were used in the original analysis, affecting the results.

## Abstract

The paper "Calorimetric Dark Matter Detection with Galactic Center Gas Clouds" (Bhoonah et al. 2018) aims to derive limits on dark matter interactions by demanding that heat transfer due to DM interactions is less than that by astrophysical cooling, using clouds in the hot, high-velocity nuclear outflow wind of the Milky Way ($T_{wind} \sim 10^{6-7}$ K, $V_{wind} \sim$ 330 km/s). We argue that clouds in such an extreme environment cannot be assumed to be stable over the long timescales associated with their radiative cooling rates. Furthermore, Bhoonah et al. (2018) uses incorrect parameters for their clouds.