The ALMA REBELS Survey: specific star formation rates in the reionization era
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The ALMA REBELS Survey : specific star formation rates in the reionization era. / Topping, Michael W.; Stark, Daniel P.; Endsley, Ryan; Bouwens, Rychard J.; Schouws, Sander; Smit, Renske; Stefanon, Mauro; Inami, Hanae; Bowler, Rebecca A. A.; Oesch, Pascal; Gonzalez, Valentino; Dayal, Pratika; da Cunha, Elisabete; Algera, Hiddo; van Der Werf, Paul; Pallottini, Andrea; Barrufet, Laia; Schneider, Raffaella; De Looze, Ilse; Sommovigo, Laura; Whitler, Lily; Graziani, Luca; Fudamoto, Yoshinobu; Ferrara, Andrea.
In: Monthly Notices of the Royal Astronomical Society, Vol. 516, No. 1, 31.08.2022, p. 975-991.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The ALMA REBELS Survey
T2 - specific star formation rates in the reionization era
AU - Topping, Michael W.
AU - Stark, Daniel P.
AU - Endsley, Ryan
AU - Bouwens, Rychard J.
AU - Schouws, Sander
AU - Smit, Renske
AU - Stefanon, Mauro
AU - Inami, Hanae
AU - Bowler, Rebecca A. A.
AU - Oesch, Pascal
AU - Gonzalez, Valentino
AU - Dayal, Pratika
AU - da Cunha, Elisabete
AU - Algera, Hiddo
AU - van Der Werf, Paul
AU - Pallottini, Andrea
AU - Barrufet, Laia
AU - Schneider, Raffaella
AU - De Looze, Ilse
AU - Sommovigo, Laura
AU - Whitler, Lily
AU - Graziani, Luca
AU - Fudamoto, Yoshinobu
AU - Ferrara, Andrea
PY - 2022/8/31
Y1 - 2022/8/31
N2 - We present specific star formation rates (sSFRs) for 40 ultraviolet (UV)-bright galaxies at z similar to 7-8 observed as part of the Reionization Era Bright Emission Line Survey (REBELS) Atacama Large Millimeter/submillimeter Array (ALMA) large programme. The sSFRs are derived using improved star formation rate (SFR) calibrations and spectral energy distribution (SED)-based stellar masses, made possible by measurements of far-infrared (FIR) continuum emission and [C II]-based spectroscopic redshifts. The median sSFR of the sample is 18(-5)(+7) Gyr(-1), significantly larger than literature measurements lacking constraints in the FIR, reflecting the larger obscured SFRs derived from the dust continuum relative to that implied by the UV+optical SED. We suggest that such differences may reflect spatial variations in dust across these luminous galaxies, with the component dominating the FIR distinct from that dominating the UV. We demonstrate that the inferred stellar masses (and hence sSFRs) arc strongly dependent on the assumed star formation history in reionization-era galaxies. When large sSFR galaxies (a population that is common at z > 6) are modelled with non-parametric star formation histories, the derived stellar masses can increase by an order of magnitude relative to constant star formation models, owing to the presence of a significant old stellar population that is outshined by the recent burst. The [C II] line widths in the largest sSFR systems are often very broad, suggesting dynamical masses capable of accommodating an old stellar population suggested by non-parametric models. Regardless of these systematic uncertainties among derived parameters, we find that sSFRs increase rapidly toward higher redshifts for massive galaxies (9.6 < log (M-*/M-circle dot) < 9.8), evolving as (1 + z)(1.7 +/- 0.3), broadly consistent with expectations from the evolving baryon accretion rates.
AB - We present specific star formation rates (sSFRs) for 40 ultraviolet (UV)-bright galaxies at z similar to 7-8 observed as part of the Reionization Era Bright Emission Line Survey (REBELS) Atacama Large Millimeter/submillimeter Array (ALMA) large programme. The sSFRs are derived using improved star formation rate (SFR) calibrations and spectral energy distribution (SED)-based stellar masses, made possible by measurements of far-infrared (FIR) continuum emission and [C II]-based spectroscopic redshifts. The median sSFR of the sample is 18(-5)(+7) Gyr(-1), significantly larger than literature measurements lacking constraints in the FIR, reflecting the larger obscured SFRs derived from the dust continuum relative to that implied by the UV+optical SED. We suggest that such differences may reflect spatial variations in dust across these luminous galaxies, with the component dominating the FIR distinct from that dominating the UV. We demonstrate that the inferred stellar masses (and hence sSFRs) arc strongly dependent on the assumed star formation history in reionization-era galaxies. When large sSFR galaxies (a population that is common at z > 6) are modelled with non-parametric star formation histories, the derived stellar masses can increase by an order of magnitude relative to constant star formation models, owing to the presence of a significant old stellar population that is outshined by the recent burst. The [C II] line widths in the largest sSFR systems are often very broad, suggesting dynamical masses capable of accommodating an old stellar population suggested by non-parametric models. Regardless of these systematic uncertainties among derived parameters, we find that sSFRs increase rapidly toward higher redshifts for massive galaxies (9.6 < log (M-*/M-circle dot) < 9.8), evolving as (1 + z)(1.7 +/- 0.3), broadly consistent with expectations from the evolving baryon accretion rates.
KW - galaxies: evolution
KW - galaxies: high-redshift
KW - SIMILAR-TO 8
KW - STELLAR POPULATION SYNTHESIS
KW - GALAXY LUMINOSITY FUNCTION
KW - SPECTRAL ENERGY-DISTRIBUTIONS
KW - DARK-MATTER HALOES
KW - C II SURVEY
KW - NEBULAR EMISSION
KW - BRIGHT END
KW - LY-ALPHA
KW - FORMING GALAXIES
U2 - 10.1093/mnras/stac2291
DO - 10.1093/mnras/stac2291
M3 - Journal article
VL - 516
SP - 975
EP - 991
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 1
ER -
ID: 319531775