CHANG-ES : XXVI. Insights into cosmic-ray transport from radio halos in edge-on galaxies

2023
journal article
article
5
cris.lastimport.wos2024-04-09T22:45:07Z
dc.abstract.enContext. Galactic winds play a key role in regulating the evolution of galaxies over cosmic time. In recent years, the role of cosmic rays (CRs) in the formation of the galactic wind has increasingly gained attention. Therefore, we use radio continuum data to analyse the CR transport in edge-on galaxies. Aims. With newly reduced radio continuum data of five edge-on galaxies (NGC 891, NGC 3432, NGC 4013, NGC 4157, and NGC 4631), we plan to set new constraints on the morphology of radio halos and the physical properties of galactic winds driven by stellar feedback. By distinguishing between the central and outer regions of the galaxies, our study setup allows us to search for variations in the radio halo profile or CR transport along the galactic disk. Methods. Data from the LOFAR Two-metre Sky Survey (LoTSS) Data Release 2 at 144 MHz (HBA) and reprocessed data from the Very Large Array (VLA) at 1.5 GHz (L band) from the Continuum Halos in Nearby Galaxies – an EVLA Survey (CHANG-ES) enable us to increase the extent of the analysed radio continuum profile significantly (up to a factor of 2) compared to previous studies. We computed thermal emission maps using a mixture approach with Hα and near-infrared data, which were then subtracted to yield radio synchrotron emission maps. Then we compiled non-thermal spectral index maps and computed intensity profiles using a box integration approach. Lastly, we performed 1D CR transport modelling. Results. The non-thermal spectral index maps show evidence that the LoTSS maps are affected by thermal absorption in star-forming regions. The scale height analysis reveals that most of the galaxies are equally well fitted with a one-component instead of a two-component exponential profile. We find a bi-modality within our sample. While NGC 3432 and NGC 4013 have similar scale heights in the L band and HBA, the low-frequency scale heights of NGC 891, NGC 4157, and NGC 4631 exceed their high-frequency counterpart significantly. The 1D CR transport modelling shows agreement between the predicted magnetic field strength and the magnetic field strength estimates of equipartition measurements. Additionally, we find an increasing difference in wind velocities (with increasing height over the galactic disk) between the central and outer regions of the analysed galaxies.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomicznepl
dc.contributor.authorStein, M.pl
dc.contributor.authorHeesen, V.pl
dc.contributor.authorDettmar, R. -J.pl
dc.contributor.authorStein, Y.pl
dc.contributor.authorBrüggen, M.pl
dc.contributor.authorBeck, R.pl
dc.contributor.authorAdebahr, B.pl
dc.contributor.authorWiegert, T.pl
dc.contributor.authorVargas, C. J.pl
dc.contributor.authorBomans, D. J.pl
dc.contributor.authorLi, J.pl
dc.contributor.authorEnglish, J.pl
dc.contributor.authorChyży, Krzysztof - 100034 pl
dc.contributor.authorPaladino, R.pl
dc.contributor.authorTabatabaei, F. S.pl
dc.contributor.authorStrong, A.pl
dc.date.accessioned2023-11-30T14:57:24Z
dc.date.available2023-11-30T14:57:24Z
dc.date.issued2023pl
dc.date.openaccess0
dc.description.accesstimew momencie opublikowania
dc.description.versionostateczna wersja wydawcy
dc.description.volume670pl
dc.identifier.articleidA158pl
dc.identifier.doi10.1051/0004-6361/202243906pl
dc.identifier.eissn1432-0746pl
dc.identifier.issn0004-6361pl
dc.identifier.urihttps://ruj.uj.edu.pl/xmlui/handle/item/323890
dc.languageengpl
dc.language.containerengpl
dc.rightsUdzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa*
dc.rights.licenceCC-BY
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/legalcode.pl*
dc.share.typeotwarte czasopismo
dc.subject.engalaxies: evolutionpl
dc.subject.engalaxies: halospl
dc.subject.engalaxies: star formationpl
dc.subject.encosmic rayspl
dc.subject.enradio continuum: galaxiespl
dc.subtypeArticlepl
dc.titleCHANG-ES : XXVI. Insights into cosmic-ray transport from radio halos in edge-on galaxiespl
dc.title.journalAstronomy & Astrophysicspl
dc.typeJournalArticlepl
dspace.entity.typePublication
cris.lastimport.wos
2024-04-09T22:45:07Z
dc.abstract.enpl
Context. Galactic winds play a key role in regulating the evolution of galaxies over cosmic time. In recent years, the role of cosmic rays (CRs) in the formation of the galactic wind has increasingly gained attention. Therefore, we use radio continuum data to analyse the CR transport in edge-on galaxies. Aims. With newly reduced radio continuum data of five edge-on galaxies (NGC 891, NGC 3432, NGC 4013, NGC 4157, and NGC 4631), we plan to set new constraints on the morphology of radio halos and the physical properties of galactic winds driven by stellar feedback. By distinguishing between the central and outer regions of the galaxies, our study setup allows us to search for variations in the radio halo profile or CR transport along the galactic disk. Methods. Data from the LOFAR Two-metre Sky Survey (LoTSS) Data Release 2 at 144 MHz (HBA) and reprocessed data from the Very Large Array (VLA) at 1.5 GHz (L band) from the Continuum Halos in Nearby Galaxies – an EVLA Survey (CHANG-ES) enable us to increase the extent of the analysed radio continuum profile significantly (up to a factor of 2) compared to previous studies. We computed thermal emission maps using a mixture approach with Hα and near-infrared data, which were then subtracted to yield radio synchrotron emission maps. Then we compiled non-thermal spectral index maps and computed intensity profiles using a box integration approach. Lastly, we performed 1D CR transport modelling. Results. The non-thermal spectral index maps show evidence that the LoTSS maps are affected by thermal absorption in star-forming regions. The scale height analysis reveals that most of the galaxies are equally well fitted with a one-component instead of a two-component exponential profile. We find a bi-modality within our sample. While NGC 3432 and NGC 4013 have similar scale heights in the L band and HBA, the low-frequency scale heights of NGC 891, NGC 4157, and NGC 4631 exceed their high-frequency counterpart significantly. The 1D CR transport modelling shows agreement between the predicted magnetic field strength and the magnetic field strength estimates of equipartition measurements. Additionally, we find an increasing difference in wind velocities (with increasing height over the galactic disk) between the central and outer regions of the analysed galaxies.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.contributor.authorpl
Stein, M.
dc.contributor.authorpl
Heesen, V.
dc.contributor.authorpl
Dettmar, R. -J.
dc.contributor.authorpl
Stein, Y.
dc.contributor.authorpl
Brüggen, M.
dc.contributor.authorpl
Beck, R.
dc.contributor.authorpl
Adebahr, B.
dc.contributor.authorpl
Wiegert, T.
dc.contributor.authorpl
Vargas, C. J.
dc.contributor.authorpl
Bomans, D. J.
dc.contributor.authorpl
Li, J.
dc.contributor.authorpl
English, J.
dc.contributor.authorpl
Chyży, Krzysztof - 100034
dc.contributor.authorpl
Paladino, R.
dc.contributor.authorpl
Tabatabaei, F. S.
dc.contributor.authorpl
Strong, A.
dc.date.accessioned
2023-11-30T14:57:24Z
dc.date.available
2023-11-30T14:57:24Z
dc.date.issuedpl
2023
dc.date.openaccess
0
dc.description.accesstime
w momencie opublikowania
dc.description.version
ostateczna wersja wydawcy
dc.description.volumepl
670
dc.identifier.articleidpl
A158
dc.identifier.doipl
10.1051/0004-6361/202243906
dc.identifier.eissnpl
1432-0746
dc.identifier.issnpl
0004-6361
dc.identifier.uri
https://ruj.uj.edu.pl/xmlui/handle/item/323890
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights*
Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa
dc.rights.licence
CC-BY
dc.rights.uri*
http://creativecommons.org/licenses/by/4.0/legalcode.pl
dc.share.type
otwarte czasopismo
dc.subject.enpl
galaxies: evolution
dc.subject.enpl
galaxies: halos
dc.subject.enpl
galaxies: star formation
dc.subject.enpl
cosmic rays
dc.subject.enpl
radio continuum: galaxies
dc.subtypepl
Article
dc.titlepl
CHANG-ES : XXVI. Insights into cosmic-ray transport from radio halos in edge-on galaxies
dc.title.journalpl
Astronomy & Astrophysics
dc.typepl
JournalArticle
dspace.entity.type
Publication
Affiliations

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