ALMA as a prominence thermometer: first observations

Heinzel, P., Berlicki, A., Bárta, M., Rudawy, P., Gunár, S., Labrosse, N. and Radziszewski, K. (2022) ALMA as a prominence thermometer: first observations. Astrophysical Journal Letters, 927(2), L29. (doi: 10.3847/2041-8213/ac588f)

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We present first prominence observations obtained with Atacama Large Millimeter Array (ALMA) in Band 3 at the wavelength of 3 mm. High-resolution observations have been coaligned with the MSDP Hα data from Wrocław–Białków large coronagraph at similar spatial resolution. We analyze one particular cotemporal snapshot, first calibrating both ALMA and MSDP data and then demonstrating a reasonable correlation between both. In particular, we can see quite similar fine-structure patterns in both ALMA brightness-temperature maps and MSDP maps of Hα intensities. Using ALMA, we intend to derive the prominence kinetic temperatures. However, having current observations only in one band, we use an independent diagnostic constraint, which is the Hα line integrated intensity. We develop an inversion code and show that it can provide realistic temperatures for brighter parts of the prominence where one gets a unique solution, while within faint structures, such inversion is ill conditioned. In brighter parts, ALMA serves as a prominence thermometer, provided that the optical thickness in Band 3 is large enough. In order to find a relation between brightness and kinetic temperatures for a given observed Hα intensity, we constructed an extended grid of non-LTE prominence models covering a broad range of prominence parameters. We also show the effect of the plane-of-sky filling factor on our results.

Item Type:Articles
Additional Information:P.H. and S.G. acknowledge support from grants GACR 19-16890S and 19-17102S of the Czech Science Foundation. P.H., M.B., and S.G. thank the support from project RVO:67985815 of the Astronomical Institute of the Czech Academy of Sciences. P.H. and A.B. were supported by the program “Excellence Initiative—Research University” for the years 2020–2026 at the University of Wrocław, project No. BPIDUB.4610.96.2021.KG. The work of A.B. was partially supported by the program “Excellence Initiative— Research University” for the years 2020–2026 at the University of Wrocław, project no. BPIDUB.4610.15.2021.KP.B. N.L. acknowledges STFC support from grant number ST/T000422/ 1.
Glasgow Author(s) Enlighten ID:Labrosse, Dr Nicolas
Authors: Heinzel, P., Berlicki, A., Bárta, M., Rudawy, P., Gunár, S., Labrosse, N., and Radziszewski, K.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Astrophysical Journal Letters
Publisher:IOP Publishing
ISSN (Online):2041-8213
Published Online:14 March 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in Astrophysical Journal Letters 927(2): L29
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
306515PHAS A&A Group STFC ConsolidatedLyndsay FletcherScience and Technology Facilities Council (STFC)ST/T000422/1P&S - Physics & Astronomy