The ALMA REBELS survey: the dust content of z similar to 7 Lyman break galaxies
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The ALMA REBELS survey : the dust content of z similar to 7 Lyman break galaxies. / Dayal, P.; Ferrara, A.; Sommovigo, L.; Bouwens, R.; Oesch, P. A.; Smit, R.; Gonzalez, Eusebio Rial; Schouws, S.; Stefanon, M.; Kobayashi, C.; Bremer, J.; Algera, H. S. B.; Aravena, M.; Bowler, R. A. A.; da Cunha, E.; Fudamoto, Y.; Graziani, L.; Hodge, J.; Inami, H.; De Looze, Margreet; Pallottini, A.; Riechers, D.; Schneider, R.; Stark, D.; Endsley, R.
In: Monthly Notices of the Royal Astronomical Society, Vol. 512, No. 1, 17.03.2022, p. 989-1002.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The ALMA REBELS survey
T2 - the dust content of z similar to 7 Lyman break galaxies
AU - Dayal, P.
AU - Ferrara, A.
AU - Sommovigo, L.
AU - Bouwens, R.
AU - Oesch, P. A.
AU - Smit, R.
AU - Gonzalez, Eusebio Rial
AU - Schouws, S.
AU - Stefanon, M.
AU - Kobayashi, C.
AU - Bremer, J.
AU - Algera, H. S. B.
AU - Aravena, M.
AU - Bowler, R. A. A.
AU - da Cunha, E.
AU - Fudamoto, Y.
AU - Graziani, L.
AU - Hodge, J.
AU - Inami, H.
AU - De Looze, Margreet
AU - Pallottini, A.
AU - Riechers, D.
AU - Schneider, R.
AU - Stark, D.
AU - Endsley, R.
PY - 2022/3/17
Y1 - 2022/3/17
N2 - We include a fully coupled treatment of metal and dust enrichment into the DELPHI semi-analytic model of galaxy formation to explain the dust content of 13 Lyman break galaxies (LBGs) detected by the Atacama Large millimetre Array (ALMA) REBELS Large Program at z similar or equal to 7. We find that the galaxy dust mass, M-d, is regulated by the combination of Type II supernova dust production, astration, shock destruction, and ejection in outflows; grain growth (with a standard time-scale tau(0) = 30 Myr) plays a negligible role. The model predicts a dust-to-stellar mass ratio of similar to 0.07-0.1 per cent and a UV-to-total star formation rate relation such that log(psi(UV)) = -0.05 [log(psi)](2) + 0.86 log(psi) - 0.05 (implying that 55-80 per cent of the star formation is obscured) for REBELS galaxies with stellar mass M-* = 10(9)-10(10)M(circle dot). This relation reconciles the intrinsic UV luminosity of LBGs with their observed luminosity function at z = 7. However, 2 out of the 13 systems show dust-to-stellar mass ratios (similar to 0.94-1.1 per cent) that are up to 18 times larger than expected from the fiducial relation. Due to the physical coupling between dust and metal enrichment, even decreasing to to very low values (0.3 Myr) only increases the dust-to-stellar mass ratio by a factor of similar to 2. Given that grain growth is not a viable explanation for such high observed ratios of the dust-to-stellar mass, we propose alternative solutions.
AB - We include a fully coupled treatment of metal and dust enrichment into the DELPHI semi-analytic model of galaxy formation to explain the dust content of 13 Lyman break galaxies (LBGs) detected by the Atacama Large millimetre Array (ALMA) REBELS Large Program at z similar or equal to 7. We find that the galaxy dust mass, M-d, is regulated by the combination of Type II supernova dust production, astration, shock destruction, and ejection in outflows; grain growth (with a standard time-scale tau(0) = 30 Myr) plays a negligible role. The model predicts a dust-to-stellar mass ratio of similar to 0.07-0.1 per cent and a UV-to-total star formation rate relation such that log(psi(UV)) = -0.05 [log(psi)](2) + 0.86 log(psi) - 0.05 (implying that 55-80 per cent of the star formation is obscured) for REBELS galaxies with stellar mass M-* = 10(9)-10(10)M(circle dot). This relation reconciles the intrinsic UV luminosity of LBGs with their observed luminosity function at z = 7. However, 2 out of the 13 systems show dust-to-stellar mass ratios (similar to 0.94-1.1 per cent) that are up to 18 times larger than expected from the fiducial relation. Due to the physical coupling between dust and metal enrichment, even decreasing to to very low values (0.3 Myr) only increases the dust-to-stellar mass ratio by a factor of similar to 2. Given that grain growth is not a viable explanation for such high observed ratios of the dust-to-stellar mass, we propose alternative solutions.
KW - dust, extinction
KW - galaxies: evolution
KW - galaxies: high-redshift
KW - galaxies: ISM
KW - galaxies: luminosity function, mass function
KW - ULTRA-DEEP FIELD
KW - UV-CONTINUUM SLOPE
KW - 1ST BILLION YEARS
KW - HIGH-REDSHIFT
KW - LUMINOSITY FUNCTION
KW - STAR-FORMATION
KW - INTERSTELLAR DUST
KW - EVOLUTION
KW - MASS
KW - EMISSION
U2 - 10.1093/mnras/stac537
DO - 10.1093/mnras/stac537
M3 - Journal article
VL - 512
SP - 989
EP - 1002
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 1
ER -
ID: 302381254