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Interstellar extinction correction in ionised regions using HeI lines | | S. Zamora
; Ángeles I. Díaz
; Elena Terlevich
; Vital Fernández
; | | Date: |
1 Aug 2022 | | Abstract: | The logarithmic extinction coefficient, c(H$eta$), is usually derived using
the H$alpha$/H$eta$ ratio for case B recombination and assuming standard
values of electron density and temperature. However, the use of strong Balmer
lines can lead to selection biases when studying regions with different surface
brightness, such as extended nebulae, with the use of single integral field
spectroscopy observations, since, in some cases, the H$alpha$ line can be
saturated in moderate to long exposures. In this work, we present a method to
derive extinction corrections based only on the weaker lines of HeI, taking
into account the presence of triplet states in these atoms and its influence on
recombination lines. We have applied this procedure to calculate the extinction
of different regions of the 30 Doradus nebula from MUSE integral-field
spectroscopy data. The comparison between helium and hydrogen c(H$eta$)
determinations has been found to yield results fully compatible within the
errors and the use of both sets of lines simultaneously reduces considerably
the error in the derivation. | | Source: | arXiv, 2208.00669 | | Services: | Forum | Review | PDF | Favorites | |
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