Mostrar el registro sencillo del ítem
dc.contributor.author
Soam, Archana
dc.contributor.author
Anderson, B. G
dc.contributor.author
Acosta Pulido, Jose
dc.contributor.author
Fernandez Lopez, Manuel
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.contributor.author
Vaillancourt, J. E.
dc.contributor.author
Widicus Weaver, S. L.
dc.contributor.author
Piirola, V.
dc.contributor.author
Gordon, M. S.
dc.date.available
2021-07-01T16:02:06Z
dc.date.issued
2021-02
dc.identifier.citation
Soam, Archana; Anderson, B. G; Acosta Pulido, Jose; Fernandez Lopez, Manuel; Vaillancourt, J. E.; et al.; On the collisional disalignment of dust grains in illuminated and shaded regions of IC 63; IOP Publishing; Astrophysical Journal; 907; 2; 2-2021; 1-14
dc.identifier.issn
0004-637X
dc.identifier.uri
http://hdl.handle.net/11336/135283
dc.description.abstract
Interstellar dust grain alignment causes polarization from UV to mm wavelengths, allowing the study of the geometry and strength of the magnetic field. Over the last couple of decades, observations and theory have led to the establishment of the radiative alignment torque mechanism as a leading candidate to explain the effect. With a quantitatively well constrained theory, polarization can be used not only to study the interstellar magnetic field, but also the dust and other environmental parameters. Photodissociation regions, with their intense, anisotropic radiation fields, consequent rapid H2 formation, and high spatial density-contrast provide a rich environment for such studies. Here we discuss an expanded optical, NIR, and mm-wave study of the IC 63 nebula, showing strong H2 formation-enhanced alignment and the first direct empirical evidence for disalignment due to gas-grain collisions using high-resolution HCO+(J = 1-0) observations. We find that a relative amount of polarization is marginally anticorrelated with column density of HCO+. However, separating the lines of sight of optical polarimetry into those behind, or in front of, a dense clump as seen from γ Cas, the distribution separates into two well defined sets, with data corresponding to "shaded" gas having a shallower slope. This is expected if the decrease in polarization is caused by collisions since collisional disalignment rate is proportional to RC∝nT" role="presentation">RC∝nT−−√ . Ratios of the best-fit slopes for the "illuminated" and "shaded" samples of lines of sight agrees, within the uncertainties, with the square root of the two-temperature H2 excitation in the nebula seen by Thi et al.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Intersterllar dust
dc.subject
Polarimetry
dc.subject.classification
Astronomía
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.subject.classification
Ciencias Físicas
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.title
On the collisional disalignment of dust grains in illuminated and shaded regions of IC 63
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-06-10T19:26:56Z
dc.journal.volume
907
dc.journal.number
2
dc.journal.pagination
1-14
dc.journal.pais
Reino Unido
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.journal.ciudad
Londres
dc.description.fil
Fil: Soam, Archana. Sofia Science Center; Estados Unidos
dc.description.fil
Fil: Anderson, B. G. Sofia Science Center; Estados Unidos
dc.description.fil
Fil: Acosta Pulido, Jose. Instituto de Astrofisica de Canarias; España
dc.description.fil
Fil: Fernandez Lopez, Manuel. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
dc.description.fil
Fil: Vaillancourt, J. E.. Lincoln Laboratory; Estados Unidos
dc.description.fil
Fil: Widicus Weaver, S. L.. Department Of Chemistry; Estados Unidos
dc.description.fil
Fil: Piirola, V.. University Of Turku; Finlandia
dc.description.fil
Fil: Gordon, M. S.. Sofia Science Center; Estados Unidos
dc.journal.title
Astrophysical Journal
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3847/1538-4357/abcb8e
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/abcb8e
Archivos asociados