HAWC+/SOFIA multiwavelength polarimetric observations of OMC-1

David T. Chuss*, B. G. Andersson, John Bally, Jessie L. Dotson, C. Darren Dowell, Jordan A. Guerra, Doyal A. Harper, Martin Houde, Terry Jay Jones, A. Lazarian, Enrique Lopez Rodriguez, Joseph M. Michail, Mark R. Morris, Giles Novak, Javad Siah, Johannes Staguhn, John E. Vaillancourt, C. G. Volpert, Michael Werner, Edward J. WollackDominic J. Benford, Marc Berthoud, Erin G. Cox, Richard Crutcher, Daniel A. Dale, L. M. Fissel, Paul F. Goldsmith, Ryan T. Hamilton, Shaul Hanany, Thomas K. Henning, Leslie W. Looney, S. Harvey Moseley, Fabio P. Santos, Ian Stephens, Konstantinos Tassis, Christopher Q. Trinh, Eric Van Camp, Derek Ward-Thompson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We report new polarimetric and photometric maps of the massive star-forming region OMC-1 using the HAWC+ instrument on the Stratospheric Observatory for Infrared Astronomy (SOFIA). We present continuum polarimetric and photometric measurements of this region at 53, 89, 154, and 214 μm at angular resolutions of 5.100, 7.900, 14.000, and 18.700 for the four bands, respectively. The photometric maps enable the computation of improved SEDs for the region. We FInd that at the longer wavelengths, the inferred magnetic FIeld conFIguration matches the \hourglass" conFIguration seen in previous studies, ndicating magnetically-regulated star formation. The FIeld morphology differs at the shorter wavelengths. The magnetic FIeld inferred at these wavelengths traces the bipolar structure of the explosive Becklin-Neugebauer (BN)/Kleinman-Low (KL) outow emerging from OMC-1 behind the Orion Nebula. Using statistical methods to estimate the FIeld strength in the region, we FInd that the explosion dominates the magnetic FIeld near the center of the feature. Farther out, the magnetic FIeld is close to energetic equilibrium with the ejecta and may be providing conFInement to the explosion. The correlation between polarization fraction and the local polarization angle dispersion indicates that the depolarization as a function of unpolarized intensity is a result of intrinsic FIeld geometry as opposed to decreases in grain alignment efficiency in denser regions.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Oct 18 2018

ASJC Scopus subject areas

  • General

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