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Tracing Interstella...
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Behrens, E.University of Virginia
(author)
Tracing Interstellar Heating: An ALCHEMI Measurement of the HCN Isomers in NGC 253
- Article/chapterEnglish2022
Publisher, publication year, extent ...
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2022-11-14
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American Astronomical Society,2022
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electronicrdacarrier
Numbers
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LIBRIS-ID:oai:research.chalmers.se:ee2cd5d8-e374-48e7-a4b7-427e35cd0121
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https://doi.org/10.3847/1538-4357/ac91ceDOI
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https://research.chalmers.se/publication/533437URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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We analyze HCN and HNC emission in the nearby starburst galaxy NGC 253 to investigate its effectiveness in tracing heating processes associated with star formation. This study uses multiple HCN and HNC rotational transitions observed using the Atacama Large Millimeter/submillimeter Array via the ALCHEMI Large Program. To understand the conditions and associated heating mechanisms within NGC 253's dense gas, we employ Bayesian nested sampling techniques applied to chemical and radiative transfer models, which are constrained using our HCN and HNC measurements. We find that the volume density n H 2 and cosmic-ray ionization rate (CRIR) ζ are enhanced by about an order of magnitude in the galaxy’s central regions as compared to those further from the nucleus. In NGC 253's central giant molecular clouds (GMCs), where observed HCN/HNC abundance ratios are the lowest, n ∼ 105.5 cm−3 and ζ ∼ 10−12 s−1 (greater than 104 times the average Galactic rate). We find a positive correlation in the association of both density and CRIR with the number of star formation-related heating sources (supernova remnants, H ii regions, and super hot cores) located in each GMC, as well as a correlation between CRIRs and supernova rates. Additionally, we see an anticorrelation between the HCN/HNC ratio and CRIR, indicating that this ratio will be lower in regions where ζ is higher. Though previous studies suggested HCN and HNC may reveal strong mechanical heating processes in NGC 253's CMZ, we find cosmic-ray heating dominates the heating budget, and mechanical heating does not play a significant role in the HCN and HNC chemistry.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Mangum, J. G.National Radio Astronomy Observatory
(author)
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Holdship, JonathanUniversiteit Leiden (UL),Leiden University (UL),University College London (UCL)
(author)
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Viti, SerenaUniversity College London (UCL),Universiteit Leiden (UL),Leiden University (UL)
(author)
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Harada, N.The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
(author)
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Martin, S.European Southern Observatory Santiago,Atacama Large Millimeter-submillimeter Array (ALMA)
(author)
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Sakamoto, K.Academia Sinica Taiwan
(author)
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Muller, Sebastien,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mullers
(author)
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Tanaka, KunihikoKeio University
(author)
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Nakanishi, KouichiroThe Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
(author)
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Herrero-Illana, R.European Southern Observatory Santiago,Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC
(author)
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Yoshimura, Y.University of Tokyo, Japan
(author)
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Aladro, Rebeca,1979Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)(Swepub:cth)aladro
(author)
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Colzi, L.Centro de Astrobiologia (CAB)
(author)
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Emig, K.L.National Radio Astronomy Observatory
(author)
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Henkel, C.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),King Abdulaziz University
(author)
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Huang, K. Y.Universiteit Leiden (UL),Leiden University (UL)
(author)
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Humire, PedroMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Meier, D. S.National Radio Astronomy Observatory Socorro,New Mexico Institute of Mining and Technology
(author)
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Rivilla, Víctor M.Centro de Astrobiologia (CAB)
(author)
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van der Werf, P.Universiteit Leiden (UL),Leiden University (UL)
(author)
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University of VirginiaNational Radio Astronomy Observatory
(creator_code:org_t)
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In:Astrophysical Journal: American Astronomical Society939:21538-43570004-637X
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Behrens, E.
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Mangum, J. G.
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Holdship, Jonath ...
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Viti, Serena
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Harada, N.
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Martin, S.
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Sakamoto, K.
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Muller, Sebastie ...
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Tanaka, Kunihiko
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Nakanishi, Kouic ...
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Herrero-Illana, ...
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Yoshimura, Y.
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Aladro, Rebeca, ...
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Colzi, L.
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Emig, K.L.
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Henkel, C.
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Huang, K. Y.
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Humire, Pedro
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Meier, D. S.
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Rivilla, Víctor ...
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van der Werf, P.
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