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Molecular isotopolo...
Molecular isotopologue measurements toward super star clusters and the relation to their ages in NGC 253 with ALCHEMI
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- Butterworth, Joshua (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Viti, Serena (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- van der Werf, P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Mangum, J. G. (author)
- National Radio Astronomy Observatory
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- Martin, S. (author)
- European Southern Observatory Santiago,Atacama Large Millimeter-submillimeter Array (ALMA)
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- Harada, N. (author)
- The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan,Academia Sinica Taiwan
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- Emig, K.L. (author)
- National Radio Astronomy Observatory
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Sakamoto, K. (author)
- The Graduate University for Advanced Studies (SOKENDAI),Academia Sinica Taiwan
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- Yoshimura, Y. (author)
- University of Tokyo, Japan
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- Tanaka, Kunihiko (author)
- Keio University
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- Herrero-Illana, R. (author)
- European Southern Observatory Santiago,Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC
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- Colzi, L. (author)
- Centro de Astrobiologia (CAB)
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- Rivilla, Víctor M. (author)
- Centro de Astrobiologia (CAB)
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- Huang, K. Y. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Bouvier, M. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Behrens, E. (author)
- University of Virginia
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- Henkel, C. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),King Abdulaziz University
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- Yan, Y. T. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Meier, D. S. (author)
- New Mexico Institute of Mining and Technology,National Radio Astronomy Observatory Socorro
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- Zhou, D. (author)
- Danmarks Tekniske Universitet,Technical University of Denmark,University of British Columbia (UBC),Universiteit Leiden (UL),Leiden University (UL)
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 686
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https://doi.org/10.1...
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Abstract
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- Context. Determining the evolution of the CNO isotopes in the interstellar medium (ISM) of starburst galaxies can yield important constraints on the ages of super star clusters (SSCs), or on other aspects and factors contributing to their evolution, such as the initial mass function (IMF). Due to the time-dependent nature of the abundances of isotopes within the ISM -as they are supplied from processes such as nucleosynthesis or chemical fractionation -, this provides the opportunity to test whether or not isotope ratios trace the ages of highly star-forming regions, such as SSCs. Aims. The goal of this study is to investigate whether the isotopic variations in SSC regions within NGC 253 are correlated with their different ages as derived from stellar population modelling. Methods. We measured abundance ratios of CO, HCN, and HCO+ isotopologues in six regions containing SSCs within NGC 253 using high-spatial-resolution (1.6″, ~28 pc) data from the ALCHEMI (ALma Comprehensive High-resolution Extragalactic Molecular Inventory) ALMA Large program. We then analysed these ratios using RADEX radiative transfer modelling, with the parameter space sampled using the nested sampling Monte Carlo algorithm MLFriends. These abundance ratios were then compared to ages predicted in each region via the fitting of observed star-formation tracers (such as Brγ) to Starburst99 starburst stellar population evolution models. Results. We determined the isotopic column density ratios across multiple regions of SSC activity in NGC 253 using non-LTE radiative transfer modelling. We do not find any significant trend with age for the CO and HCN isotopologue ratios on timescales of the ages of the SSC∗ regions observed. However, HCO+ may show a correlation with age over these timescales in 12C/13C. Conclusions. The driving factors of these ratios within SSCs could be the IMF or fractionation effects. To further probe these effects in SSCs over time, a larger sample of SSCs must be observed spanning a larger age range.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- Galaxies: starburst
- Galaxies: active
- ISM: molecules
- Astrochemistry
- Galaxies: ISM
Publication and Content Type
- art (subject category)
- ref (subject category)
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Butterworth, Jos ...
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Viti, Serena
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van der Werf, P.
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Mangum, J. G.
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Martin, S.
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Harada, N.
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show more...
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Emig, K.L.
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Muller, Sebastie ...
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Sakamoto, K.
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Yoshimura, Y.
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Tanaka, Kunihiko
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Herrero-Illana, ...
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Colzi, L.
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Rivilla, Víctor ...
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Huang, K. Y.
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Bouvier, M.
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Behrens, E.
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Henkel, C.
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Yan, Y. T.
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Meier, D. S.
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Zhou, D.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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Astronomy and As ...
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Chalmers University of Technology