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COSMOS-Web: The Role of Galaxy Interactions and Disk Instabilities in Producing Starbursts at z<4

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arxiv 2405.09619 v2 pith:JH5UFBIW submitted 2024-05-15 astro-ph.GA

A. L. Faisst , L. Yang , M. Brinch , C. M. Casey , N. Chartab , M. Dessauges-Zavadsky , N. E. Drakos , S. Gillman
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G. Gonzaliasl C. C. Hayward O. Ilbert P. Jablonka A. Kaminsky J. S. Kartaltepe A. M. Koekemoer V. Kokorev E. Lambrides D. Liu C. Maraston C. L. Martin A. Renzini B. E. Robertson D. B. Sanders Z. Sattari N. Scoville C. M. Urry A. P. Vijayan J. R. Weaver H. B. Akins N. Allen R. C. Arango-Toro O. R. Cooper M. Franco F. Gentile S. Harish M. Hirschmann A. A. Khostovan C. Laigle R. L. Larson M. Lee Z. Liu A. S. Long G. Magdis R. Massey H. J. McCracken J. McKinney L. Paquereau J. Rhodes R. M. Rich M. Shuntov J. D. Silverman M. Talia S. Toft J. A. Zavala
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We study of the role of galaxy-galaxy interactions and disk instabilities in producing starburst activity in galaxies out to z = 4. For this, we use a sample of 387 galaxies with robust total star formation rate measurements from Herschel, gas masses from ALMA, stellar masses and redshifts from multi-band photometry, and JWST/NIRCam rest-frame optical imaging. Using mass-controlled samples, we find an increased fraction of interacting galaxies in the starburst regime at all redshifts out to z = 4. This increase correlates with star formation efficiency (SFE), but not with gas fraction. However, the correlation is weak (and only significant out to z = 2), which could be explained by the short duration of SFE increase during interaction. In addition, we find that isolated disk galaxies make up a significant fraction of the starburst population. The fraction of such galaxies with star-forming clumps ("clumpy disks") is significantly increased compared to the main-sequence disk population. Furthermore, this fraction directly correlates with SFE. This is direct observational evidence for a long-term increase of SFE maintained due to disk instabilities, contributing to the majority of starburst galaxies in our sample and hence to substantial mass growth in these systems. This result could also be of importance for explaining the growth of the most massive galaxies at z > 6.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. PANORAMIC: Discovery of an Ultra-Massive Grand-Design Spiral Galaxy at $z\sim5.2$

    astro-ph.GA 2024-12 conditional novelty 8.0 of 10

    A JWST survey reports Zhúlóng, a Milky Way-mass grand-design spiral galaxy candidate at z~5.2, the most distant such system yet identified.

  2. A multi-wavelength investigation of spiral structures in $z > 1$ galaxies with JWST

    astro-ph.GA 2025-01 conditional novelty 7.0 of 10

    Spiral arms in z~1.5 galaxies show optical-to-near-infrared flux peak offsets of 0.2 to 0.8 kpc, consistent with density waves, tidal interactions, and clumpy star formation as seen locally.

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