PHANGS–JWST First Results: Stellar-feedback-driven Excitation and Dissociation of Molecular Gas in the Starburst Ring of NGC 1365?

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Liu, Daizhong (author)

PHANGS–JWST First Results : Stellar-feedback-driven Excitation and Dissociation of Molecular Gas in the Starburst Ring of NGC 1365?

Article/chapterEnglish2023

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2023-02-16
American Astronomical Society,2023
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LIBRIS-ID:oai:DiVA.org:su-215795
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-215795URI
https://doi.org/10.3847/2041-8213/aca973DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

We compare embedded young massive star clusters (YMCs) to (sub-)millimeter line observations tracing the excitation and dissociation of molecular gas in the starburst ring of NGC 1365. This galaxy hosts one of the strongest nuclear starbursts and richest populations of YMCs within 20 Mpc. Here we combine near-/mid-IR PHANGS–JWST imaging with new Atacama Large Millimeter/submillimeter Array multi-J CO (1–0, 2–1 and 4–3) and [C ı] (1–0) mapping, which we use to trace CO excitation via R42 = ICO(4−3)/ICO(2−1) and R21 = ICO(2−1)/ICO(1−0) and dissociation via RCICO = I[CI](1−0)/ICO(2−1) at 330 pc resolution. We find that the gas flowing into the starburst ring from northeast to southwest appears strongly affected by stellar feedback, showing decreased excitation (lower R42) and increased signatures of dissociation (higher RCICO) in the downstream regions. There, radiative-transfer modeling suggests that the molecular gas density decreases and temperature and [CI/CO] abundance ratio increase. We compare R42 and RCICO with local conditions across the regions and find that both correlate with near-IR 2 μm emission tracing the YMCs and with both polycyclic aromatic hydrocarbon (11.3 μm) and dust continuum (21 μm) emission. In general, RCICO exhibits ∼0.1 dex tighter correlations than R42, suggesting C ı to be a more sensitive tracer of changing physical conditions in the NGC 1365 starburst than CO (4–3). Our results are consistent with a scenario where gas flows into the two arm regions along the bar, becomes condensed/shocked, forms YMCs, and then these YMCs heat and dissociate the gas.

Subject headings and genre

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
Interstellar medium
Molecular gas
Young massive clusters
Stellar feedback
Starburst galaxies
Interstellar line emission
Barred spiral galaxies
CO line emission
AGN host galaxies
Dust continuum emission

Added entries (persons, corporate bodies, meetings, titles ...)

Schinnerer, Eva (author)
Cao, Yixian (author)
Leroy, Adam (author)
Usero, Antonio (author)
Rosolowsky, Erik (author)
Kruijssen, J. M. Diederik (author)
Chevance, Mélanie (author)
Glover, Simon C. O. (author)
Sormani, Mattia C. (author)
Bolatto, Alberto D. (author)
Sun, Jiayi (author)
Stuber, Sophia K. (author)
Teng, Yu-Hsuan (author)
Bigiel, Frank (author)
Bešlić, Ivana (author)
Grasha, Kathryn (author)
Henshaw, Jonathan D. (author)
Barnes, Ashley T. (author)
den Brok, Jakob S. (author)
Saito, Toshiki (author)
Dale, Daniel A. (author)
Watkins, Elizabeth J. (author)
Pan, Hsi-An (author)
Klessen, Ralf S. (author)
Emsellem, Eric (author)
Anand, Gagandeep S. (author)
Deger, Sinan,1985-Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)side0330 (author)
Egorov, Oleg V. (author)
Faesi, Christopher M. (author)
Hassani, Hamid (author)
Larson, Kirsten L. (author)
Lee, Janice C. (author)
Lopez, Laura A. (author)
Pety, Jérôme (author)
Sandstrom, Karin (author)
Thilker, David A. (author)
Whitmore, Bradley C. (author)
Williams, Thomas G. (author)
Stockholms universitetFysikum (creator_code:org_t)

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In:Astrophysical Journal Letters: American Astronomical Society944:22041-82052041-8213

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