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Journal Article

Relative Alignment between the Magnetic Field and Molecular Gas Structure in the Vela C Giant Molecular Cloud Using Low- and High-density Tracers

MPS-Authors

Fissel,  Laura M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ade,  Peter A. R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Angilè,  Francesco E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ashton,  Peter
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Benton,  Steven J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chen,  Che-Yu
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cunningham,  Maria
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Devlin,  Mark J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dober,  Bradley
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Friesen,  Rachel
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fukui,  Yasuo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Galitzki,  Nicholas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gandilo,  Natalie N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Goodman,  Alyssa
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Green,  Claire-Elise
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jones,  Paul
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Klein,  Jeffrey
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

King,  Patrick
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Korotkov,  Andrei L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Li,  Zhi-Yun
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lowe,  Vicki
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martin,  Peter G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Matthews,  Tristan G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Moncelsi,  Lorenzo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nakamura,  Fumitaka
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Netterfield,  Calvin B.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Newmark,  Amanda
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Novak,  Giles
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pascale,  Enzo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Poidevin,  Frédérick
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Santos,  Fabio P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Savini,  Giorgio
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Scott,  Douglas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shariff,  Jamil A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Soler,  Juan D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Thomas,  Nicholas E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tucker,  Carole E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tucker,  Gregory S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ward-Thompson,  Derek
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zucker,  Catherine
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019ApJ...878..110F
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Citation

Fissel, L. M., Ade, P. A. R., Angilè, F. E., Ashton, P., Benton, S. J., Chen, C.-Y., et al. (2019). Relative Alignment between the Magnetic Field and Molecular Gas Structure in the Vela C Giant Molecular Cloud Using Low- and High-density Tracers. The Astrophysical Journal, 878.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D130-8
Abstract
We compare the magnetic field orientation for the young giant molecular cloud Vela C inferred from 500 μm polarization maps made with the BLASTPol balloon-borne polarimeter to the orientation of structures in the integrated line emission maps from Mopra observations. Averaging over the entire cloud we find that elongated structures in integrated line-intensity or zeroth-moment maps, for low-density tracers such as 12CO and 13CO J → 1 - 0, are statistically more likely to align parallel to the magnetic field, while intermediate- or high-density tracers show (on average) a tendency for alignment perpendicular to the magnetic field. This observation agrees with previous studies of the change in relative orientation with column density in Vela C, and supports a model where the magnetic field is strong enough to have influenced the formation of dense gas structures within Vela C. The transition from parallel to no preferred/perpendicular orientation appears to occur between the densities traced by 13CO and by C18O J → 1 - 0. Using RADEX radiative transfer models to estimate the characteristic number density traced by each molecular line, we find that the transition occurs at a molecular hydrogen number density of approximately 103 cm−3. We also see that the Centre Ridge (the highest column density and most active star-forming region within Vela C) appears to have a transition at a lower number density, suggesting that this may depend on the evolutionary state of the cloud.