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http://hdl.handle.net/20.500.12386/30310
Title: | Merger induced clump formation in distant infrared luminous starburst galaxies | Authors: | Antonello Calabrò Emanuele Daddi Jérémy Fensch Frédéric Bournaud Anna Cibinel Annagrazia Puglisi Shuowen Jin DELVECCHIO, IVAN Chiara D'Eugenio |
Issue Date: | 2019 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 632 | First Page: | A98 | Abstract: | While the formation of stellar clumps in distant galaxies is usually attributed to gravitational violent disk instabilities, we show here that major mergers also represent a competitive mechanism to form bright clumps. Using ~0.1'' resolution ACS F814W images in the entire COSMOS field, we measure the fraction of clumpy emission in 109 main sequence (MS) and 79 Herschel-detected starbursts (off-MS) galaxies at 0.5 < z < 0.9, representative of normal versus merger induced star-forming activity, respectively. We additionally identify merger samples from visual inspection and from Gini-M20 morphological parameters. Regardless of the merger criteria adopted, the clumpiness distribution of merging systems is different from that of normal isolated disks at > 99.5 % confidence level, with the former reaching higher clumpiness values, up to 20 % of the total galaxy emission. We confirm the merger induced clumpiness enhancement with novel hydrodynamical simulations of colliding galaxies with gas fractions typical of z ~ 0.7. Multi-wavelength images of three starbursts in the CANDELS field support the young nature of clumps, which are likely merger products rather than older pre-existing structures. Finally, for a subset of 19 starbursts with existing near-IR rest frame spectroscopy, we find that the clumpiness is mildly anti-correlated with the merger phase, decreasing towards final coalescence. Our result can explain recent ALMA detections of clumps in hyperluminous high-z starbursts, while normal objects are smooth. This work raises a question on the role of mergers on the origin of clumps in high redshift galaxies in general. | URI: | http://hdl.handle.net/20.500.12386/30310 | URL: | http://arxiv.org/abs/1910.01661v1 https://www.aanda.org/articles/aa/full_html/2019/12/aa35778-19/aa35778-19.html |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201935778 | Bibcode ADS: | 2019A&A...632A..98C | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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Calabrò2019.pdf | Pdf editoriale | 10.4 MB | Adobe PDF | View/Open |
30310-Calabrò2019_P01.pdf | Miur | 3.51 MB | Adobe PDF | |
30310-Calabrò2019_P02.pdf | Miur | 6.98 MB | Adobe PDF |
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