<!doctype html><html lang="en" class="no-js"><head><meta charset="utf-8"> <!-- begin SEO --><title> Maps of Magnetic Field Strength in the OMC-1 using HAWC+ FIR Polarimetric data - Joseph M. Michail Astrophysicist</title><meta property="og:locale" content="en-US"><meta property="og:site_name" content="Joseph M. Michail | Astrophysicist"><meta property="og:title" content="Maps of Magnetic Field Strength in the OMC-1 using HAWC+ FIR Polarimetric data"><link rel="canonical" href="https://joemichail.github.io/publication/2020-07-paper-OMC1-number9.md"><meta property="og:url" content="https://joemichail.github.io/publication/2020-07-paper-OMC1-number9.md"><meta property="og:description" content="Abstract: Far-infrared (FIR) dust polarimetry enables the study of interstellar magnetic fields via tracing of the polarized emission from dust grains that are partially aligned with the direction of the field. The advent of high quality polarimetric data has permitted the use of statistical methods to extract both the direction and magnitude of the magnetic field. This work presents an effort to produce maps (integrated along the line of sight) of the magnetic field strength in both the line-of-sight (LOS) direction and in the plane-of-sky (POS) in the Orion Molecular Cloud (OMC-1) using all four HAWC+ polarimetry bands (53, 89, 154 and 214 μm ). Using the statistics of the polarization data (angles and fractions) along with previously-reported Zeeman measurements, information about the three-dimensional magnetic field configuration was inferred over the OMC-1 region. POS magnetic field strengths of up to 2 mG were determined in OMC-1. The strongest fields were observed near the BN/KL object, while the OMC-1 bar shows strengths of up to few hundreds of μG. The LOS magnetic field has been determined to have comparable strengths to the POS components but it is differently distributed across the cloud. These estimates of the magnetic field components were used to produce more reliable maps of the mass-to-magnetic flux ratio ( M/Φ ) – a proxy for probing the conditions for star formation in molecular clouds – and determine regions of sub- and super-criticality in OMC-1. Such maps can provide invaluable input and comparison to MHD simulations of star formation processes in filamentary structures of molecular clouds."><meta property="og:type" content="article"><meta property="article:published_time" content="2020-07-01T00:00:00-05:00"> <script type="application/ld+json"> { "@context" : "http://schema.org", "@type" : "Person", "name" : "Joe Michail", "url" : "https://joemichail.github.io", "sameAs" : null } </script> <!-- end SEO --><link href="https://joemichail.github.io/feed.xml" type="application/atom+xml" rel="alternate" title="Joseph M. 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The advent of high quality polarimetric data has permitted the use of statistical methods to extract both the direction and magnitude of the magnetic field. This work presents an effort to produce maps (integrated along the line of sight) of the magnetic field strength in both the line-of-sight (LOS) direction and in the plane-of-sky (POS) in the Orion Molecular Cloud (OMC-1) using all four HAWC+ polarimetry bands (53, 89, 154 and 214 μm ). Using the statistics of the polarization data (angles and fractions) along with previously-reported Zeeman measurements, information about the three-dimensional magnetic field configuration was inferred over the OMC-1 region. POS magnetic field strengths of up to 2 mG were determined in OMC-1. The strongest fields were observed near the BN/KL object, while the OMC-1 bar shows strengths of up to few hundreds of μG. The LOS magnetic field has been determined to have comparable strengths to the POS components but it is differently distributed across the cloud. These estimates of the magnetic field components were used to produce more reliable maps of the mass-to-magnetic flux ratio ( M/Φ ) – a proxy for probing the conditions for star formation in molecular clouds – and determine regions of sub- and super-criticality in OMC-1. Such maps can provide invaluable input and comparison to MHD simulations of star formation processes in filamentary structures of molecular clouds."><meta itemprop="datePublished" content="July 01, 2020"><div class="page__inner-wrap"><header><h1 class="page__title" itemprop="headline">Maps of Magnetic Field Strength in the OMC-1 using HAWC+ FIR Polarimetric data</h1><p>Published in <i>arXiv</i>, 2020</p><p>Recommended citation: Guerra et al. (2020). &quot;Maps of Magnetic Field Strength in the OMC-1 using HAWC+ FIR Polarimetric data&quot; <i>arXiV:2007.04923 (Submitted to ApJ)</i> <a href="https://ui.adsabs.harvard.edu/#abs/2020arXiv200704923G/abstract"><u>https://ui.adsabs.harvard.edu/#abs/2020arXiv200704923G/abstract</u></a></p></header><section class="page__content" itemprop="text"><p><a href="https://ui.adsabs.harvard.edu/link_gateway/2020arXiv200704923G/EPRINT_PDF">Download paper here</a></p></section><footer class="page__meta"></footer><section class="page__share"><h4 class="page__share-title">Share on</h4><a href="https://twitter.com/intent/tweet?text=https://joemichail.github.io/publication/2020-07-paper-OMC1-number9.md" class="btn btn--twitter" title="Share on Twitter"><i class="fab fa-twitter" aria-hidden="true"></i><span> Twitter</span></a> <a href="https://www.facebook.com/sharer/sharer.php?u=https://joemichail.github.io/publication/2020-07-paper-OMC1-number9.md" class="btn btn--facebook" title="Share on Facebook"><i class="fab fa-facebook" aria-hidden="true"></i><span> Facebook</span></a> <a href="https://www.linkedin.com/shareArticle?mini=true&url=https://joemichail.github.io/publication/2020-07-paper-OMC1-number9.md" class="btn btn--linkedin" title="Share on LinkedIn"><i class="fab fa-linkedin" aria-hidden="true"></i><span> LinkedIn</span></a></section><nav class="pagination"> <a href="https://joemichail.github.io/publication/2020-01-paper-NGC1068-number8" class="pagination--pager" title="SOFIA/HAWC+ Traces the Magnetic Fields in NGC 1068 ">Previous</a> <a href="https://joemichail.github.io/publication/2020-08-paper-OMC1-number10.md" class="pagination--pager" title="Far-Infrared Polarization Spectrum of the OMC-1 Star-Forming Region ">Next</a></nav></div></article></div><div class="page__footer"><footer> <!-- start custom footer snippets --> <a href="/sitemap/">Sitemap</a> <!-- end custom footer snippets --><div class="page__footer-follow"><ul class="social-icons"><li><strong>Follow:</strong></li><li><a href="http://github.com/JoeMichail"><i class="fab fa-github" aria-hidden="true"></i> GitHub</a></li><li><a href="https://joemichail.github.io/feed.xml"><i class="fa fa-fw fa-rss-square" aria-hidden="true"></i> Feed</a></li></ul></div><div class="page__footer-copyright">&copy; 2020 Joe Michail. 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