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Verfasst von:Hygate, Alexander P. S. [VerfasserIn]   i
 Kruijssen, Diederik [VerfasserIn]   i
 Chevance, Mélanie [VerfasserIn]   i
 Haydon, Daniel T. [VerfasserIn]   i
Titel:An uncertainty principle for star formation - IV. On the nature and filtering of diffuse emission
Verf.angabe:Alexander P.S. Hygate, J.M. Diederik Kruijssen, Mélanie Chevance, Andreas Schruba, Daniel T. Haydon and Steven N. Longmore
E-Jahr:2019
Jahr:25 July 2019
Umfang:25 S.
Fussnoten:Gesehen am 05.11.2019
Titel Quelle:Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
Ort Quelle:Oxford : Oxford Univ. Press, 1827
Jahr Quelle:2019
Band/Heft Quelle:488(2019), 2, Seite 2800-2824
ISSN Quelle:1365-2966
Abstract:Diffuse emission is observed in galaxies in many tracers across the electromagnetic spectrum, including tracers of star formation, such as H α and ultraviolet (UV), and tracers of gas mass, such as carbon monoxide (CO) transition lines and the 21-cm line of atomic hydrogen (H I). Its treatment is key to extracting meaningful information from observations such as cloudscale star formation rates. Finally, studying diffuse emission can reveal information about the physical processes taking place in the interstellar medium, such as chemical transitions and the nature of stellar feedback (through the photon escape fraction). We present a physically motivated method for decomposing astronomical images containing both diffuse emission and compact regions of interest, such as H II regions or molecular clouds, into diffuse and compact component images through filtering in Fourier space. We have previously presented a statistical method for constraining the evolutionary timeline of star formation and mean separation length between compact star-forming regions with galaxy-scale observations. We demonstrate how these measurements are biased by the presence of diffuse emission in tracer maps and that by using the mean separation length as a critical length-scale to separate diffuse emission from compact emission, we are able to remove its biasing effect. Furthermore, this method provides, without the need for interferometry or ancillary spectral data, a measurement of the diffuse emission fraction in input tracer maps and decomposed diffuse and compact emission maps for further analysis.
DOI:doi:10.1093/mnras/stz1779
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1093/mnras/stz1779
 Verlag: https://academic.oup.com/mnras/article/488/2/2800/5538810
 DOI: https://doi.org/10.1093/mnras/stz1779
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1681037173
Verknüpfungen:→ Zeitschrift

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