GOODS-ALMA 2.0: Last gigayear star formation histories of the so-called starbursts within the main sequence
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GOODS-ALMA 2.0 : Last gigayear star formation histories of the so-called starbursts within the main sequence. / Ciesla, L.; Gomez-Guijarro, C.; Buat, V.; Elbaz, D.; Jin, S.; Bethermin, M.; Daddi, E.; Franco, M.; Inami, H.; Magdis, G.; Magnelli, B.; Xiao, M.
I: Astronomy & Astrophysics, Bind 672, A191, 20.04.2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - GOODS-ALMA 2.0
T2 - Last gigayear star formation histories of the so-called starbursts within the main sequence
AU - Ciesla, L.
AU - Gomez-Guijarro, C.
AU - Buat, V.
AU - Elbaz, D.
AU - Jin, S.
AU - Bethermin, M.
AU - Daddi, E.
AU - Franco, M.
AU - Inami, H.
AU - Magdis, G.
AU - Magnelli, B.
AU - Xiao, M.
PY - 2023/4/20
Y1 - 2023/4/20
N2 - Recently, a population of compact main sequence (MS) galaxies exhibiting starburst-like properties were identified in the GOODS-ALMA blind survey at 1.1 mm. Several evolution scenarios were proposed to explain their particular physical properties (e.g., compact size, low gas content, short depletion time). In this work, we aim to study the star formation history (SFH) of the GOODS-ALMA galaxies to understand whether or not the so-called starbursts (SBs) in the MS' galaxies exhibit a star formation activity over the last gigayear that is different from that of the MS galaxies and that could explain their specificity. We use the CIGALE SED modelling code to which we add nonparametric SFHs. To compare the recent SFHs of the galaxies quantitatively, we define a parameter, the star formation rate (SFR) gradient, which provides the angle showing the direction that a galaxy has followed in the SFR-versus-stellar-mass plane over a given period. We show that SB in the MS galaxies show positive or weak negative gradients over the last 100, 300, and 1000 Myr, which is at odds with a scenario where these galaxies would be transitioning from the SB region at the end of a strong starburst phase. Normal GOODS-ALMA galaxies and "SB in the MS" galaxies show the same SFR gradient distribution, meaning that they have similar recent SFHs despite their different properties (compactness, low depletion time). The "SBs in the MS" galaxies manage to maintain their star-formation activity, allowing them to stay within the MS. This points toward a diversity of galaxies within a complex MS.
AB - Recently, a population of compact main sequence (MS) galaxies exhibiting starburst-like properties were identified in the GOODS-ALMA blind survey at 1.1 mm. Several evolution scenarios were proposed to explain their particular physical properties (e.g., compact size, low gas content, short depletion time). In this work, we aim to study the star formation history (SFH) of the GOODS-ALMA galaxies to understand whether or not the so-called starbursts (SBs) in the MS' galaxies exhibit a star formation activity over the last gigayear that is different from that of the MS galaxies and that could explain their specificity. We use the CIGALE SED modelling code to which we add nonparametric SFHs. To compare the recent SFHs of the galaxies quantitatively, we define a parameter, the star formation rate (SFR) gradient, which provides the angle showing the direction that a galaxy has followed in the SFR-versus-stellar-mass plane over a given period. We show that SB in the MS galaxies show positive or weak negative gradients over the last 100, 300, and 1000 Myr, which is at odds with a scenario where these galaxies would be transitioning from the SB region at the end of a strong starburst phase. Normal GOODS-ALMA galaxies and "SB in the MS" galaxies show the same SFR gradient distribution, meaning that they have similar recent SFHs despite their different properties (compactness, low depletion time). The "SBs in the MS" galaxies manage to maintain their star-formation activity, allowing them to stay within the MS. This points toward a diversity of galaxies within a complex MS.
KW - galaxies: evolution
KW - galaxies: fundamental parameters
KW - HIGH-Z GALAXIES
KW - FORMING GALAXIES
KW - SUBMILLIMETER GALAXIES
KW - MASSIVE GALAXIES
KW - HIGH-REDSHIFT
KW - STELLAR-MASS
KW - MODEL
KW - EVOLUTION
KW - QUIESCENT
KW - RECONSTRUCTION
U2 - 10.1051/0004-6361/202245376
DO - 10.1051/0004-6361/202245376
M3 - Journal article
VL - 672
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
M1 - A191
ER -
ID: 355108873