Molecular isotopologue measurements toward super star clusters and the relation to their ages in NGC253 with ALCHEMI

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Bibliographic Details
Main Authors:	Butterworth, J., Viti, S., Van der Werf, P. P., Mangum, J. G., Martín, S., Harada, N., Emig, K. L., Muller, S., Sakamoto, K., Yoshimura, Y., Tanaka, K., Herrero-Illana, R., Colzi, L., Rivilla, V. M., Huang, K. Y., Bouvier, M., Behrens, E., Henkel, C., Yan, Y. T., Meier, D. S., Zhou, D.
Format:	Preprint
Published:	2024
Subjects:	Astrophysics of Galaxies
Online Access:	Acceder al recurso
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author	Butterworth, J. Viti, S. Van der Werf, P. P. Mangum, J. G. Martín, S. Harada, N. Emig, K. L. Muller, S. Sakamoto, K. Yoshimura, Y. Tanaka, K. Herrero-Illana, R. Colzi, L. Rivilla, V. M. Huang, K. Y. Bouvier, M. Behrens, E. Henkel, C. Yan, Y. T. Meier, D. S. Zhou, D.
author_facet	Butterworth, J. Viti, S. Van der Werf, P. P. Mangum, J. G. Martín, S. Harada, N. Emig, K. L. Muller, S. Sakamoto, K. Yoshimura, Y. Tanaka, K. Herrero-Illana, R. Colzi, L. Rivilla, V. M. Huang, K. Y. Bouvier, M. Behrens, E. Henkel, C. Yan, Y. T. Meier, D. S. Zhou, D.
contents	Determining the evolution of the CNO isotopes in the interstellar medium (ISM) of starburst galaxies can yield important constraints on the ages of superstar clusters (SSCs), or on other aspects and contributing factors of their evolution. 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 possible opportunity to probe the ability of isotopes ratios to trace the ages of high star forming regions, such as SSCs. The goal of this study is to investigate whether the isotopic variations in SSC regions within NGC253 are correlated with their different ages as derived from stellar population modelling. We have measured abundance ratios of CO, HCN and HCO$^+$ isotopologues in six regions containing SSCs within NGC253 using high spatial resolution (1.6",$\sim 28$pc) data from the ALCHEMI (ALma Comprehensive High-resolution Extragalactic Molecular Inventory) ALMA Large program. We have 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 Br$γ$) to starburst stellar population evolution models. We do not find any significant trend with age for the CO and HCN isotopologue ratios on the timescales for the ages of the SSC* regions observed. The driving factors of these ratios within SSCs could be the Initial Mass Function as well as possibly fractionation effects. To further probe these effects in SSCs over time a larger sample of SSCs must be observed spanning a larger age range.
format	Preprint
id	arxiv_https___arxiv_org_abs_2402_10721
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Molecular isotopologue measurements toward super star clusters and the relation to their ages in NGC253 with ALCHEMI Butterworth, J. Viti, S. Van der Werf, P. P. Mangum, J. G. Martín, S. Harada, N. Emig, K. L. Muller, S. Sakamoto, K. Yoshimura, Y. Tanaka, K. Herrero-Illana, R. Colzi, L. Rivilla, V. M. Huang, K. Y. Bouvier, M. Behrens, E. Henkel, C. Yan, Y. T. Meier, D. S. Zhou, D. Astrophysics of Galaxies Determining the evolution of the CNO isotopes in the interstellar medium (ISM) of starburst galaxies can yield important constraints on the ages of superstar clusters (SSCs), or on other aspects and contributing factors of their evolution. 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 possible opportunity to probe the ability of isotopes ratios to trace the ages of high star forming regions, such as SSCs. The goal of this study is to investigate whether the isotopic variations in SSC regions within NGC253 are correlated with their different ages as derived from stellar population modelling. We have measured abundance ratios of CO, HCN and HCO$^+$ isotopologues in six regions containing SSCs within NGC253 using high spatial resolution (1.6",$\sim 28$pc) data from the ALCHEMI (ALma Comprehensive High-resolution Extragalactic Molecular Inventory) ALMA Large program. We have 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 Br$γ$) to starburst stellar population evolution models. We do not find any significant trend with age for the CO and HCN isotopologue ratios on the timescales for the ages of the SSC* regions observed. The driving factors of these ratios within SSCs could be the Initial Mass Function as well as possibly fractionation effects. To further probe these effects in SSCs over time a larger sample of SSCs must be observed spanning a larger age range.
title	Molecular isotopologue measurements toward super star clusters and the relation to their ages in NGC253 with ALCHEMI
topic	Astrophysics of Galaxies
url	https://arxiv.org/abs/2402.10721