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  • Pelgrims, VincentPanepistimio Kritis,University of Crete,Idryma Technologias kai Erevnas (FORTH),Foundation for Research and Technology Hellas (FORTH) (författare)

Starlight-polarization-based tomography of the magnetized ISM: PASIPHAE's line-of-sight inversion method

  • Artikel/kapitelEngelska2023

Förlag, utgivningsår, omfång ...

  • 2023-02-23
  • EDP Sciences,2023

Nummerbeteckningar

  • LIBRIS-ID:oai:research.chalmers.se:4702ac82-afde-4a54-becd-735594cad258
  • https://doi.org/10.1051/0004-6361/202244625DOI
  • https://research.chalmers.se/publication/537317URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:art swepub-publicationtype
  • Ämneskategori:ref swepub-contenttype

Anmärkningar

  • We present the first Bayesian method for tomographic decomposition of the plane-of-sky orientation of the magnetic field with the use of stellar polarimetry and distance. This standalone tomographic inversion method presents an important step forward in reconstructing the magnetized interstellar medium (ISM) in three dimensions within dusty regions. We develop a model in which the polarization signal from the magnetized and dusty ISM is described by thin layers at various distances, a working assumption which should be satisfied in small-angular circular apertures. Our modeling makes it possible to infer the mean polarization (amplitude and orientation) induced by individual dusty clouds and to account for the turbulence-induced scatter in a generic way. We present a likelihood function that explicitly accounts for uncertainties in polarization and parallax. We develop a framework for reconstructing the magnetized ISM through the maximization of the log-likelihood using a nested sampling method. We test our Bayesian inversion method on mock data, representative of the high Galactic latitude sky, taking into account realistic uncertainties from Gaia and as expected for the optical polarization survey PASIPHAE according to the currently planned observing strategy. We demonstrate that our method is effective at recovering the cloud properties as soon as the polarization induced by a cloud to its background stars is higher than ~0.1% for the adopted survey exposure time and level of systematic uncertainty. The larger the induced polarization is, the better the method's performance, and the lower the number of required stars. Our method makes it possible to recover not only the mean polarization properties but also to characterize the intrinsic scatter, thus creating new ways to characterize ISM turbulence and the magnetic field strength. Finally, we apply our method to an existing data set of starlight polarization with known line-of-sight decomposition, demonstrating agreement with previous results and an improved quantification of uncertainties in cloud properties.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Panopoulou, Georgia,1989California Institute of Technology (Caltech)(Swepub:cth)georgiap (författare)
  • Tassis, KonstantinosPanepistimio Kritis,University of Crete,Idryma Technologias kai Erevnas (FORTH),Foundation for Research and Technology Hellas (FORTH) (författare)
  • Pavlidou, VasilikiPanepistimio Kritis,University of Crete (författare)
  • Basyrov, A.Universitetet i Oslo,University of Oslo (författare)
  • Blinov, DmitriyPanepistimio Kritis,University of Crete (författare)
  • Gjerlow, E.Universitetet i Oslo,University of Oslo (författare)
  • Kiehlmann, S.Panepistimio Kritis,University of Crete (författare)
  • Mandarakas, N.Panepistimio Kritis,University of Crete (författare)
  • Papadaki, A.Panepistimio Kritis,University of Crete (författare)
  • Skalidis, RaphaelIdryma Technologias kai Erevnas (FORTH),Foundation for Research and Technology Hellas (FORTH),Panepistimio Kritis,University of Crete (författare)
  • Tsouros, A.Panepistimio Kritis,University of Crete (författare)
  • Anche, R. M.Inter-University Centre for Astronomy and Astrophysics (IUCAA) (författare)
  • Eriksen, H. K.Universitetet i Oslo,University of Oslo (författare)
  • Ghosh, TuhinNational Institute of Science Education and Research (författare)
  • Kypriotakis, J. A.Panepistimio Kritis,University of Crete (författare)
  • Maharana, SiddharthPanepistimio Kritis,University of Crete (författare)
  • Ntormousi, E.Panepistimio Kritis,University of Crete,Idryma Technologias kai Erevnas (FORTH),Foundation for Research and Technology Hellas (FORTH) (författare)
  • Pearson, T. J.California Institute of Technology (Caltech) (författare)
  • Potter, S. B.South African Astronomical Observatory (författare)
  • Panepistimio KritisIdryma Technologias kai Erevnas (FORTH) (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Astronomy and Astrophysics: EDP Sciences6700004-63611432-0746

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