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Probing the cold magnetized Universe with SPICA-POL (B-BOP)

André, Ph., Hughes, A., Guillet, V., Boulanger, F., Bracco, A., Ntormousi, E., Arzoumanian, D., Maury, A.J., Bernard, J.-Ph., Bontemps, S., Ristorcelli, I., Girart, J.M., Motte, F., Tassis, K., Pantin, E., Montmerle, T., Johnstone, D., Gabici, S., Efstathiou, A., Basu, S., Béthermin, M., Beuther, H., Braine, J., Di Francesco, J., Falgarone, E., Ferrière, K., Fletcher, A., Galametz, M., Giard, M., Hennebelle, P., Jones, A., Kepley, A.A., Kwon, J., Lagache, G., Lesaffre, P., Levrier, F., Li, D., Li, Z.-Y., Mao, S.A., Nakagawa, T., Onaka, T., Paladino, R., Peretto, N. ORCID:, Poglitsch, A., Revéret, V., Rodriguez, L., Sauvage, M., Soler, J.D., Spinoglio, L., Tabatabaei, F., Tritsis, A., van der Tak, F., Ward-Thompson, D., Wiesemeyer, H., Ysard, N. and Zhang, H. 2019. Probing the cold magnetized Universe with SPICA-POL (B-BOP). Publications of the Astronomical Society of Australia 36 , e029. 10.1017/pasa.2019.20

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Space Infrared Telescope for Cosmology and Astrophysics (SPICA), the cryogenic infrared space telescope recently pre-selected for a ‘Phase A’ concept study as one of the three remaining candidates for European Space Agency (ESA's) fifth medium class (M5) mission, is foreseen to include a far-infrared polarimetric imager [SPICA-POL, now called B-fields with BOlometers and Polarizers (B-BOP)], which would offer a unique opportunity to resolve major issues in our understanding of the nearby, cold magnetised Universe. This paper presents an overview of the main science drivers for B-BOP, including high dynamic range polarimetric imaging of the cold interstellar medium (ISM) in both our Milky Way and nearby galaxies. Thanks to a cooled telescope, B-BOP will deliver wide-field 100–350 m images of linearly polarised dust emission in Stokes Q and U with a resolution, signal-to-noise ratio, and both intensity and spatial dynamic ranges comparable to those achieved by Herschel images of the cold ISM in total intensity (Stokes I). The B-BOP 200 m images will also have a factor 30 higher resolution than Planck polarisation data. This will make B-BOP a unique tool for characterising the statistical properties of the magnetised ISM and probing the role of magnetic fields in the formation and evolution of the interstellar web of dusty molecular filaments giving birth to most stars in our Galaxy. B-BOP will also be a powerful instrument for studying the magnetism of nearby galaxies and testing Galactic dynamo models, constraining the physics of dust grain alignment, informing the problem of the interaction of cosmic rays with molecular clouds, tracing magnetic fields in the inner layers of protoplanetary disks, and monitoring accretion bursts in embedded protostars.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Cambridge University Press
ISSN: 1323-3580
Date of First Compliant Deposit: 11 June 2019
Date of Acceptance: 8 May 2019
Last Modified: 03 May 2023 02:28

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