Mass Profile Calculation Tools
==============================

Junhua GU, Weitian LI, Zhenghao ZHU


Introduction
------------
This directory contains the tools/scripts used to calculate the mass profile
for our big Chandra ACIS sample of galaxy groups and clusters.


NOTE
----
* mass calculation references:
  + Walker et al. 2012, MNRAS, 422, 3503-3515
    [ADS:2012MNRAS.422.3503W](http://adsabs.harvard.edu/abs/2012MNRAS.422.3503W)
  + Ettori et al. 2013, Space Science Reviews, 177, 119-154
    [ADS:2013SSRv..177..119E](http://adsabs.harvard.edu/abs/2013SSRv..177..119E)
* Errors are calculated at 68% confident level.
* NFW profile is employed to extrapolate the mass profile.
* We use a self-proposed model (i.e., *wang2012* model) to describe/fit the gas
  temperature profile.
* The single-beta and double-beta models (with a constant background) are used
  to describe the gas density profile.


TODO
----
* to merge the scripts/tools for single-beta and double-beta SBP models
  (to reduce code duplications)
* the uncertainties/errors calculation **maybe** inappropriate/problematic
  (e.g., ``analyze_mass_profile.py``)
  why not just use the quantile-based (e.g., Q84.15-Q15.85 ~= 68.3%) uncertainties
  or standard deviation ???