# Magnetic Field Structure of Dense Cores using Spectroscopic Methods

## TL;DR

This paper introduces the core field structure (CFS) model to estimate magnetic field strength and fluctuations in dense cores using spectroscopic and polarization data, providing insights into magnetic properties in star-forming regions.

## Contribution

The paper presents a novel CFS model that predicts magnetic field profiles in dense cores based on gas kinematics and polarization data, advancing magnetic field analysis methods.

## Key findings

- All cores have a transcritical mass-to-flux ratio.
- The CFS model accurately predicts magnetic field fluctuation profiles.
- Magnetic field strength estimates align with observational data.

## Abstract

We develop a new ''core field structure'' (CFS) model to predict the magnetic field strength and magnetic field fluctuation profile of dense cores using gas kinematics. We use spatially resolved observations of the nonthermal velocity dispersion from the Green Bank Ammonia survey along with column density maps from SCUBA-2 to estimate the magnetic field strength across seven dense cores located in the L1688 region of Ophiuchus. The CFS model predicts the profile of the relative field fluctuation, which is related to the observable dispersion in direction of the polarization vectors. Within the context of our model we find that all the cores have a transcritical mass-to-flux ratio.