A1 Refereed original research article in a scientific journal

Evidence for H2 Formation Driven Dust Grain Alignment in IC 63




AuthorsB-G Andersson, V Piirola, J De Buizer, D P Clemens, A Uomoto, M Charcos-Llorens, T R Geballe, A Lazarian, T Hoang, T Vornanen

PublisherIOP PUBLISHING LTD

Publishing placeBRISTOL; TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND

Publication year2013

JournalAstrophysical Journal

Journal name in sourceAstrophysical Journal

Journal acronymAstrophys.J.

Number in series2

Volume775

Issue2

First page 84

Last page84

Number of pages16

ISSN0004-637X

DOIhttps://doi.org/10.1088/0004-637X/775/2/84(external)


Abstract
In the interstellar medium (ISM), molecular hydrogen is expected to form almost exclusively on the surfaces of dust grains. Due to that molecule's large formation energy (-4.5 eV), several dynamical effects are likely associated with the process, including the alignment of asymmetric dust grains with the ambient magnetic field. Such aligned dust grains are, in turn, believed to cause the broadband optical/infrared polarization observed in the ISM. Here, we present the first observational evidence for grain alignment driven by H-2 formation, by showing that the polarization of the light from stars behind the reflection nebula IC 63 appears to correlate with the intensity of H-2 fluorescence. While our results strongly suggest a role for "Purcell rockets" in grain alignment, additional observations are needed to conclusively confirm their role. By showing a direct connection between H-2 formation and a probe of the dust characteristics, these results also provide one of the first direct confirmations of the grain-surface formation of H-2. We compare our observations to ab initio modeling based on Radiative Torque Alignment (RAT) theory.



Last updated on 2024-26-11 at 20:52