Dust polarization modeling at large-scale over the Northern Galactic cap using EBHIS and Planck data
| Autor: | Urmas Haud, Peter M. W. Kalberla, Tuhin Ghosh, Debabrata Adak, Tarun Souradeep, François Boulanger, Peter G. Martin, Andrea Bracco |
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| Přispěvatelé: | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
ISM: structure
Astrophysics::High Energy Astrophysical Phenomena Cosmic microwave background FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences symbols.namesake 0103 physical sciences Phenomenological model Thermal Planck 010306 general physics Galaxy: general 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics extinction Gravitational wave Turbulence Computer Science::Information Retrieval turbulence Astrophysics::Instrumentation and Methods for Astrophysics Astronomy and Astrophysics Polarization (waves) Astrophysics - Astrophysics of Galaxies Magnetic field Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) symbols submillimeter: ISM ISM: magnetic fields dust [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| Zdroj: | Astron.Astrophys. Astron.Astrophys., 2020, 640, pp.A100. ⟨10.1051/0004-6361/201936124⟩ |
| Popis: | The primary source of systematic uncertainty in the quest for the B-mode polarization of the Cosmic Microwave Background (CMB) introduced by primordial gravitational waves is polarized thermal emission from Galactic dust. Therefore, accurate characterization and separation of the polarized thermal dust emission is an essential step in distinguishing such a faint CMB B-mode signal. We provide a modelling framework to simulate polarized thermal dust emission based on the model described in Ghosh et al. (2017), making use of both the Planck dust and Effelsberg-Bonn HI surveys over the northern Galactic cap. Our seven-parameter dust model, incorporating both HI gas in three different column density templates as a proxy for spatially variable dust intensity and a phenomenological model of Galactic magnetic field, is able to reproduce both 1- and 2-point statistics of the observed dust polarization maps seen by Planck at 353 GHz over a selected low-column density region in the northern Galactic cap. This work has important applications in assessing the accuracy of component separation methods and in quantifying the confidence level of separating polarized Galactic emission and the CMB B-mode signal, as is needed for ongoing and future CMB missions. Comment: 12 pages, 12 figures, Accepted in A&A |
| Databáze: | OpenAIRE |
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