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Molecular gas cloud...
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)
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Richard, Johan (author)
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Combes, Françoise (author)
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- Messa, Matteo, 1988- (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Université de Genève, Switzerland
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Nagy, David (author)
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Mayer, Lucio (author)
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Schaerer, Daniel (author)
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Egami, Eiichi (author)
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- Adamo, Angela, 1981- (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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(creator_code:org_t)
- 2023-01-13
- 2023
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 519:4, s. 6222-6238
- Related links:
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https://doi.org/10.1...
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Abstract
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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
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- gravitational lensing
- strong - galaxies
- high-redshift - galaxies
- individual
- A521-sys1-galaxies
- ISM - galaxies
- star formation
Publication and Content Type
- ref (subject category)
- art (subject category)
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Dessauges-Zavads ...
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Richard, Johan
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Combes, François ...
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Messa, Matteo, 1 ...
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Nagy, David
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Mayer, Lucio
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Schaerer, Daniel
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Egami, Eiichi
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Adamo, Angela, 1 ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Stockholm University