Normal, dust-obscured galaxies in the epoch of reionization
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Normal, dust-obscured galaxies in the epoch of reionization. / Fudamoto, Y.; Oesch, P. A.; Schouws, S.; Stefanon, M.; Smit, R.; Bouwens, R. J.; Bowler, R. A. A.; Endsley, R.; Gonzalez, V.; Inami, H.; Labbe, I.; Stark, D.; Aravena, M.; Barrufet, L.; da Cunha, E.; Dayal, P.; Ferrara, A.; Graziani, L.; Hodge, J.; Hutter, A.; Li, Y.; De Looze, I.; Nanayakkara, T.; Pallottini, A.; Riechers, D.; Schneider, R.; Ucci, G.; van der Werf, P.; White, C.
I: Nature, Bind 597, Nr. 7877, 23.09.2021, s. 489-492.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Normal, dust-obscured galaxies in the epoch of reionization
AU - Fudamoto, Y.
AU - Oesch, P. A.
AU - Schouws, S.
AU - Stefanon, M.
AU - Smit, R.
AU - Bouwens, R. J.
AU - Bowler, R. A. A.
AU - Endsley, R.
AU - Gonzalez, V.
AU - Inami, H.
AU - Labbe, I.
AU - Stark, D.
AU - Aravena, M.
AU - Barrufet, L.
AU - da Cunha, E.
AU - Dayal, P.
AU - Ferrara, A.
AU - Graziani, L.
AU - Hodge, J.
AU - Hutter, A.
AU - Li, Y.
AU - De Looze, I.
AU - Nanayakkara, T.
AU - Pallottini, A.
AU - Riechers, D.
AU - Schneider, R.
AU - Ucci, G.
AU - van der Werf, P.
AU - White, C.
PY - 2021/9/23
Y1 - 2021/9/23
N2 - Two serendipitously detected dust-obscured galaxies are reported at z = 6.7 and 7.4, with estimates that such galaxies provide an additional 10-25% contribution to the total star formation rate density at z > 6.Over the past decades, rest-frame ultraviolet (UV) observations have provided large samples of UV luminous galaxies at redshift (z) greater than 6 (refs. (1-3)), during the so-called epoch of reionization. While a few of these UV-identified galaxies revealed substantial dust reservoirs(4-7), very heavily dust-obscured sources at these early times have remained elusive. They are limited to a rare population of extreme starburst galaxies(8-12) and companions of rare quasars(13,14). These studies conclude that the contribution of dust-obscured galaxies to the cosmic star formation rate density at z > 6 is sub-dominant. Recent ALMA and Spitzer observations have identified a more abundant, less extreme population of obscured galaxies at z = 3-6 (refs. (15,16)). However, this population has not been confirmed in the reionization epoch so far. Here, we report the discovery of two dust-obscured star-forming galaxies at z = 6.6813 +/- 0.0005 and z = 7.3521 +/- 0.0005. These objects are not detected in existing rest-frame UV data and were discovered only through their far-infrared [C ii] lines and dust continuum emission as companions to typical UV-luminous galaxies at the same redshift. The two galaxies exhibit lower infrared luminosities and star-formation rates than extreme starbursts, in line with typical star-forming galaxies at z approximate to 7. This population of heavily dust-obscured galaxies appears to contribute 10-25% to the z > 6 cosmic star formation rate density.
AB - Two serendipitously detected dust-obscured galaxies are reported at z = 6.7 and 7.4, with estimates that such galaxies provide an additional 10-25% contribution to the total star formation rate density at z > 6.Over the past decades, rest-frame ultraviolet (UV) observations have provided large samples of UV luminous galaxies at redshift (z) greater than 6 (refs. (1-3)), during the so-called epoch of reionization. While a few of these UV-identified galaxies revealed substantial dust reservoirs(4-7), very heavily dust-obscured sources at these early times have remained elusive. They are limited to a rare population of extreme starburst galaxies(8-12) and companions of rare quasars(13,14). These studies conclude that the contribution of dust-obscured galaxies to the cosmic star formation rate density at z > 6 is sub-dominant. Recent ALMA and Spitzer observations have identified a more abundant, less extreme population of obscured galaxies at z = 3-6 (refs. (15,16)). However, this population has not been confirmed in the reionization epoch so far. Here, we report the discovery of two dust-obscured star-forming galaxies at z = 6.6813 +/- 0.0005 and z = 7.3521 +/- 0.0005. These objects are not detected in existing rest-frame UV data and were discovered only through their far-infrared [C ii] lines and dust continuum emission as companions to typical UV-luminous galaxies at the same redshift. The two galaxies exhibit lower infrared luminosities and star-formation rates than extreme starbursts, in line with typical star-forming galaxies at z approximate to 7. This population of heavily dust-obscured galaxies appears to contribute 10-25% to the z > 6 cosmic star formation rate density.
KW - STAR-FORMING GALAXIES
KW - LUMINOSITY FUNCTION
KW - ALMA SURVEY
KW - EVOLUTION
KW - REDSHIFT
KW - POPULATION
KW - MODEL
KW - MASS
U2 - 10.1038/s41586-021-03846-z
DO - 10.1038/s41586-021-03846-z
M3 - Journal article
C2 - 34552254
VL - 597
SP - 489
EP - 492
JO - Nature
JF - Nature
SN - 0028-0836
IS - 7877
ER -
ID: 281222218