Molecular gas cloud properties at z ≃ 1 revealed by the superb angular resolution achieved with ALMA and gravitational lensing

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Dessauges-Zavadsky, Miroslava (author)

Molecular gas cloud properties at z ≃ 1 revealed by the superb angular resolution achieved with ALMA and gravitational lensing

Article/chapterEnglish2023

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2023-01-13
Oxford University Press (OUP),2023
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LIBRIS-ID:oai:DiVA.org:su-215883
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-215883URI
https://doi.org/10.1093/mnras/stad113DOI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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Current observations favour that the massive ultraviolet-bright clumps with a median stellar mass of ∼107M⊙, ubiquitously observed in z ∼ 1–3 galaxies, are star-forming regions formed in situ in galaxies. It has been proposed that they result from gas fragmentation due to gravitational instability of gas-rich, turbulent, and high-redshift discs. We bring support to this scenario by reporting the new discovery of giant molecular clouds (GMCs) in the strongly lensed, clumpy, main-sequence galaxy, A521-sys1, at z = 1.043. Its CO(4–3) emission was mapped with the Atacama Large Millimetre/submillimetre Array (ALMA) at an angular resolution of 0.19 × 0.16 arcsec2, reading down to 30 pc, thanks to gravitational lensing. We identified 14 GMCs, most being virialized, with 105.9−107.9M⊙ masses and a median 800M⊙ pc−2 molecular gas mass surface density, that are, respectively, 100 and 10 times higher than for nearby GMCs. They are also characterized by 10 times higher supersonic turbulence with a median Mach number of 60. They end up to fall above the Larson scaling relations, similarly to the GMCs in another clumpy z ≃ 1 galaxy, the Cosmic Snake, although differences between the two sets of high-redshift GMCs exist. Altogether they support that GMCs form with properties that adjust to the ambient interstellar medium conditions prevalent in the host galaxy whatever its redshift. The detected A521-sys1 GMCs are massive enough to be the parent gas clouds of stellar clumps, with a relatively high star formation efficiency per free-fall time of ∼11 per cent.

Subject headings and genre

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
gravitational lensing
strong - galaxies
high-redshift - galaxies
individual
A521-sys1-galaxies
ISM - galaxies
star formation

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

Richard, Johan (author)
Combes, Françoise (author)
Messa, Matteo,1988-Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Université de Genève, Switzerland(Swepub:su)mame4466 (author)
Nagy, David (author)
Mayer, Lucio (author)
Schaerer, Daniel (author)
Egami, Eiichi (author)
Adamo, Angela,1981-Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)anad2127 (author)
Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

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In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)519:4, s. 6222-62380035-87111365-2966

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