Full disc [CII] mapping of nearby star-forming galaxies: SOFIA FIFI/LS observations of NGC 3627, NGC 4321, and NGC 6946

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Hauptverfasser:	Kovačić, I., Barnes, A. T., Bigiel, F., De Looze, I., Madden, S. C., Herrera-Camus, R., Krabbe, A., Baes, M., Beck, A., Bolatto, A. D., Bryant, A., Colditz, S., Fischer, C., Geis, N., Iserlohe, C., Klein, R., Leroy, A., Looney, L. W., Poglitsch, A., Sartorio, N. S., Vacca, W. D., van der Giessen, S., Nersesian, A.
Format:	Preprint
Veröffentlicht:	2024
Schlagworte:	Astrophysics of Galaxies
Online-Zugang:	Acceder al recurso
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_version_	1866909500429041664
author	Kovačić, I. Barnes, A. T. Bigiel, F. De Looze, I. Madden, S. C. Herrera-Camus, R. Krabbe, A. Baes, M. Beck, A. Bolatto, A. D. Bryant, A. Colditz, S. Fischer, C. Geis, N. Iserlohe, C. Klein, R. Leroy, A. Looney, L. W. Poglitsch, A. Sartorio, N. S. Vacca, W. D. van der Giessen, S. Nersesian, A.
author_facet	Kovačić, I. Barnes, A. T. Bigiel, F. De Looze, I. Madden, S. C. Herrera-Camus, R. Krabbe, A. Baes, M. Beck, A. Bolatto, A. D. Bryant, A. Colditz, S. Fischer, C. Geis, N. Iserlohe, C. Klein, R. Leroy, A. Looney, L. W. Poglitsch, A. Sartorio, N. S. Vacca, W. D. van der Giessen, S. Nersesian, A.
contents	As a major cooling line of interstellar gas, the far-infrared 158 μm line from singly ionised carbon [CII] is an important tracer of various components of the interstellar medium in galaxies across all spatial and morphological scales. Yet, there is still not a strong constraint on the origins of [CII] emission. In this work, we derive the resolved [CII] star formation rate relation and aim to unravel the complexity of the origin of [CII]. We used the Field-Imaging Far-Infrared Line Spectrometer on board the Stratospheric Observatory for Infrared Astronomy to map [CII] in three nearby star-forming galaxies at sub-kiloparsec scales, namely, NGC 3627, NGC 4321, and NGC 6946, and we compared these [CII] observations to the galactic properties derived from complementary data from the literature. We find that the relationship between the [CII] fine structure line and star formation rate shows variations between the galaxies as well as between different environments within each galaxy. Our results show that the use of [CII] as a tracer for star formation is much more tangled than has previously been suggested within the extragalactic literature, which typically focuses on small regions of galaxies and/or uses large-aperture sampling of many different physical environments. As found within resolved observations of the Milky Way, the picture obtained from [CII] observations is complicated by its local interstellar medium conditions. Future studies will require a larger sample and additional observational tracers, obtained on spatial scales within galaxies, in order to accurately disentangle the origin of [CII] and calibrate its use as a star formation tracer.
format	Preprint
id	arxiv_https___arxiv_org_abs_2412_17645
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Full disc [CII] mapping of nearby star-forming galaxies: SOFIA FIFI/LS observations of NGC 3627, NGC 4321, and NGC 6946 Kovačić, I. Barnes, A. T. Bigiel, F. De Looze, I. Madden, S. C. Herrera-Camus, R. Krabbe, A. Baes, M. Beck, A. Bolatto, A. D. Bryant, A. Colditz, S. Fischer, C. Geis, N. Iserlohe, C. Klein, R. Leroy, A. Looney, L. W. Poglitsch, A. Sartorio, N. S. Vacca, W. D. van der Giessen, S. Nersesian, A. Astrophysics of Galaxies As a major cooling line of interstellar gas, the far-infrared 158 μm line from singly ionised carbon [CII] is an important tracer of various components of the interstellar medium in galaxies across all spatial and morphological scales. Yet, there is still not a strong constraint on the origins of [CII] emission. In this work, we derive the resolved [CII] star formation rate relation and aim to unravel the complexity of the origin of [CII]. We used the Field-Imaging Far-Infrared Line Spectrometer on board the Stratospheric Observatory for Infrared Astronomy to map [CII] in three nearby star-forming galaxies at sub-kiloparsec scales, namely, NGC 3627, NGC 4321, and NGC 6946, and we compared these [CII] observations to the galactic properties derived from complementary data from the literature. We find that the relationship between the [CII] fine structure line and star formation rate shows variations between the galaxies as well as between different environments within each galaxy. Our results show that the use of [CII] as a tracer for star formation is much more tangled than has previously been suggested within the extragalactic literature, which typically focuses on small regions of galaxies and/or uses large-aperture sampling of many different physical environments. As found within resolved observations of the Milky Way, the picture obtained from [CII] observations is complicated by its local interstellar medium conditions. Future studies will require a larger sample and additional observational tracers, obtained on spatial scales within galaxies, in order to accurately disentangle the origin of [CII] and calibrate its use as a star formation tracer.
title	Full disc [CII] mapping of nearby star-forming galaxies: SOFIA FIFI/LS observations of NGC 3627, NGC 4321, and NGC 6946
topic	Astrophysics of Galaxies
url	https://arxiv.org/abs/2412.17645