Upper Limits to Magnetic Fields in the Outskirts of Galaxies

Abstract

Based on CO(2-1) public data, we study the monoxide oxygen gas excitation conditions and the magnetic field strength of four spiral galaxies. For the galaxy outskirts, we found kinetic temperatures in the range of $\lesssim$35--38 K, CO column densities $\lesssim 10^{15}$--$10^{16}$ cm${}^{-2}$, and H${}_2$ masses $\lesssim 4\times 10^6$--$6\times 10^8$ M${}_{\odot }$. An H${}_2$ density $\lesssim 10^3$ 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 by using their masses and H${}_2$ densities to evaluate a simplified magneto-hydrodynamic equation. Our estimations provide values for the magnetic field strength on the order of $\lesssim$6--31 {$\upmu$G}.

References in corpus (6)

• A computer program for fast non-LTE analysis of interstellar line spectra
• HERACLES: The HERA CO-Line Extragalactic Survey
• Magnetic fields and spiral arms in the galaxy M51
• Magnetic fields in barred galaxies. IV. NGC 1097 and NGC 1365
• The Most Completely Sampled Rotation Curves for Galaxies
• Discovery of a strong spiral magnetic field crossing the inner pseudoring of NGC 4736

Cited by in corpus (2)

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