Ericson López, Jairo Armijos, Mario Llerena, Franklin Aldás
Published 2018-10-31Version 1
Based on CO(2-1) public data, we study the monoxide oxygen gas excitation conditions and the magnetic field strength of NGC 2841, NGC 3077, NGC 3184, NGC 3351 spiral galaxies. For their galaxy outskirts, we found kinetic temperatures in the range of $35 - 38 ~K$, CO column densities $10^{15} - 10^{16} ~cm^{-2}$ and H2 masses of $4 ~10^6 - 6 ~ 10^8 M_\odot$. An H2 density 1$0^3 cm^{-3}$ is suitable to explain the 2 sigma upper limits of the CO(2-1) line intensity. We constrain the magnetic field strength for our sample of spiral galaxies and their outskirts, evaluating a simplified expression of the magneto-hydrodynamic force equation. Our estimations provide values for the magnetic field strength in the order of $6-31 ~\mu G$.
Comments: 3 pages, 1 figure. arXiv admin note: substantial text overlap with arXiv:1709.06496
Upper Limits to Magnetic Fields in the Outskirts of Galaxies
Most-Likely DCF Estimates of Magnetic Field Strength
Stellar populations of the bulges of four spiral galaxies
![QR code for arXiv:1811.00008 [astro-ph.GA]](http://oss.arxitics.com/images/favicon.svg)