Planck 2018 results. IV. Diffuse component separation
Abstract
We present full-sky maps of the cosmic microwave background (CMB) and polarized synchrotron and thermal dust emission, derived from the third set of Planck frequency maps. These products have significantly lower contamination from instrumental systematic effects than previous versions. The methodologies used to derive these maps follow closely those described in earlier papers, adopting four methods (Commander, NILC, SEVEM, and SMICA) to extract the CMB component, as well as three methods (Commander, GNILC, and SMICA) to extract astrophysical components. Our revised CMB temperature maps agree with corresponding products in the Planck 2015 delivery, whereas the polarization maps exhibit significantly lower large-scale power, reflecting the improved data processing described in companion papers; however, the noise properties of the resulting data products are complicated, and the best available end-to-end simulations exhibit relative biases with respect to the data at the few percent level. Using these maps, we are for the first time able to fit the spectral index of thermal dust independently over 3° regions. We derive a conservative estimate of the mean spectral index of polarized thermal dust emission of β_d = 1.55 ± 0.05, where the uncertainty marginalizes both over all known systematic uncertainties and different estimation techniques. For polarized synchrotron emission, we find a mean spectral index of β_s = −3.1 ± 0.1, consistent with previously reported measurements. We note that the current data processing does not allow for construction of unbiased single-bolometer maps, and this limits our ability to extract CO emission and correlated components. The foreground results for intensity derived in this paper therefore do not supersede corresponding Planck 2015 products. For polarization the new results supersede the corresponding 2015 products in all respects.
Additional Information
© 2020 ESO. Article published by EDP Sciences. Received 16 July 2018; Accepted 13 January 2019; Published online 11 September 2020. Planck (http://www.esa.int/Planck) is a project of the European Space Agency (ESA) with instruments provided by two scientific consortia funded by ESA member states and led by Principal Investigators from France and Italy, telescope reflectors provided through a collaboration between ESA and a scientific consortium led and funded by Denmark, and additional contributions from NASA (USA). The Planck Collaboration acknowledges the support of: ESA; CNES, and CNRS/INSU-IN2P3-INP (France); ASI, CNR, and INAF (Italy); NASA and DoE (USA); STFC and UKSA (UK); CSIC, MINECO, JA, and RES (Spain); Tekes, AoF, and CSC (Finland); DLR and MPG (Germany); CSA (Canada); DTU Space (Denmark); SER/SSO (Switzerland); RCN (Norway); SFI (Ireland); FCT/MCTES (Portugal); ERC and PRACE (EU). A description of the Planck Collaboration and a list of its members, indicating which technical or scientific activities they have been involved in, can be found at http://www.cosmos.esa.int/web/planck/planck-collaboration. This work has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement numbers 687312, 776282 and 772253.
Attached Files
Submitted - 1807.06208.pdf
Published - aa33881-18.pdf
Files
Name | Size | Download all |
---|---|---|
md5:6e5f0e9b07d19d6d45417aa5ef9cde4d
|
43.4 MB | Preview Download |
md5:f8c2f3b0d948397d54e016b2fff9ef02
|
20.1 MB | Preview Download |
Additional details
- Eprint ID
- 96787
- DOI
- 10.1051/0004-6361/201833881
- Resolver ID
- CaltechAUTHORS:20190627-110918453
- arXiv
- arXiv:1807.06208
- European Space Agency (ESA)
- Centre National d'Études Spatiales (CNES)
- Centre National de la Recherche Scientifique (CNRS)
- Institut National des Sciences de l'Univers (INSU)
- Agenzia Spaziale Italiana (ASI)
- Consiglio Nazionale delle Ricerche (CNR)
- Istituto Nazionale di Astrofisica (INAF)
- NASA
- Department of Energy (DOE)
- Science and Technology Facilities Council (STFC)
- United Kingdom Space Agency (UKSA)
- Consejo Superior de Investigaciones Científicas (CSIC)
- Ministerio de Economía, Industria y Competitividad (MINECO)
- Junta de Andalucía
- Red Española de Supercomputación (RES)
- Ministry of Employment and the Economy (Finland)
- Academy of Finland
- Finnish IT Center for Science (CSC)
- Deutsches Zentrum für Luft- und Raumfahrt (DLR)
- Max Planck Society
- Canadian Space Agency (CSA)
- DTU Space (Denmark)
- State Secretariat for Education and Research (Switzerland)
- Swiss Space Office (SSO)
- Research Council of Norway
- Science Foundation, Ireland
- Fundação para a Ciência e a Tecnologia (FCT)
- Ministério da Ciência, Tecnologia e Ensino Superior (MCTES)
- Partnership for Advanced Computing in Europe (PRACE)
- 687312
- European Research Council (ERC)
- 776282
- European Research Council (ERC)
- 772253
- European Research Council (ERC)
- Created
-
2019-06-27Created from EPrint's datestamp field
- Updated
-
2023-03-15Created from EPrint's last_modified field