TY - JOUR
T1 - The ALMA REBELS Survey
T2 - dust continuum detections at z > 6.5
AU - Inami, Hanae
AU - Algera, Hiddo S.B.
AU - Schouws, Sander
AU - Sommovigo, Laura
AU - Bouwens, Rychard
AU - Smit, Renske
AU - Stefanon, Mauro
AU - Bowler, Rebecca A.A.
AU - Endsley, Ryan
AU - Ferrara, Andrea
AU - Oesch, Pascal
AU - Stark, Daniel
AU - Aravena, Manuel
AU - Barrufet, Laia
AU - Da Cunha, Elisabete
AU - Dayal, Pratika
AU - De Looze, Ilse
AU - Fudamoto, Yoshinobu
AU - Gonzalez, Valentino
AU - Graziani, Luca
AU - Hodge, Jacqueline A.
AU - Hygate, Alexander P.S.
AU - Nanayakkara, Themiya
AU - Pallottini, Andrea
AU - Riechers, Dominik A.
AU - Schneider, Raffaella
AU - Topping, Michael
AU - Van Der Werf, Paul
PY - 2022/9/1
Y1 - 2022/9/1
N2 - We report 18 dust continuum detections (≥3.3σ) at ∼88 and 158 $\mu{\rm m}$ out of 49 ultraviolet (UV)-bright galaxies (MUV < -21.3 mag) at $z$ > 6.5, observed by the Cycle-7 Atacama Large Millimeter/submillimeter Array (ALMA) Large Program, Reionization-Era Bright Emission Line Survey (REBELS) and its pilot programs. This has more than tripled the number of dust continuum detections known at $z$ > 6.5. Out of these 18 detections, 12 are reported for the first time as part of REBELS. In addition, 15 of the dust continuum detected galaxies also show a [C ii]$_{\rm 158\,{\rm \mu m}}$ emission line, providing us with accurate redshifts. We anticipate more line emission detections from six targets (including three continuum detected targets) where observations are still ongoing. We estimate that all of the sources have an infrared (IR) luminosity (LIR) in a range of $3\!-\!8 \times 10^{11}\, {\rm L_\odot }$, except for one with $L_{\rm IR} = 1.5^{+0.8}_{-0.5} \times 10^{12}\, \, {\rm L_{\odot }}$. Their fraction of obscured star formation is significant at ${\gtrsim} 50{{\ \rm per\ cent}}$, despite being UV-selected galaxies. Some of the dust continuum detected galaxies show spatial offsets (∼0.5-1.5 arcsec) between the rest-UV and far-IR emission peaks. These separations could imply spatially decoupled phases of obscured and unobscured star formation, but a higher spatial resolution observation is required to confirm this. REBELS offers the best available statistical constraints on obscured star formation in UV-luminous galaxies at $z$ > 6.5.
AB - We report 18 dust continuum detections (≥3.3σ) at ∼88 and 158 $\mu{\rm m}$ out of 49 ultraviolet (UV)-bright galaxies (MUV < -21.3 mag) at $z$ > 6.5, observed by the Cycle-7 Atacama Large Millimeter/submillimeter Array (ALMA) Large Program, Reionization-Era Bright Emission Line Survey (REBELS) and its pilot programs. This has more than tripled the number of dust continuum detections known at $z$ > 6.5. Out of these 18 detections, 12 are reported for the first time as part of REBELS. In addition, 15 of the dust continuum detected galaxies also show a [C ii]$_{\rm 158\,{\rm \mu m}}$ emission line, providing us with accurate redshifts. We anticipate more line emission detections from six targets (including three continuum detected targets) where observations are still ongoing. We estimate that all of the sources have an infrared (IR) luminosity (LIR) in a range of $3\!-\!8 \times 10^{11}\, {\rm L_\odot }$, except for one with $L_{\rm IR} = 1.5^{+0.8}_{-0.5} \times 10^{12}\, \, {\rm L_{\odot }}$. Their fraction of obscured star formation is significant at ${\gtrsim} 50{{\ \rm per\ cent}}$, despite being UV-selected galaxies. Some of the dust continuum detected galaxies show spatial offsets (∼0.5-1.5 arcsec) between the rest-UV and far-IR emission peaks. These separations could imply spatially decoupled phases of obscured and unobscured star formation, but a higher spatial resolution observation is required to confirm this. REBELS offers the best available statistical constraints on obscured star formation in UV-luminous galaxies at $z$ > 6.5.
KW - galaxies: evolution
KW - galaxies: formation
KW - galaxies: high-redshift
KW - galaxies: ISM
KW - infrared: galaxies
KW - methods: observational
UR - http://www.scopus.com/inward/record.url?scp=85136154344&partnerID=8YFLogxK
U2 - 10.1093/mnras/stac1779
DO - 10.1093/mnras/stac1779
M3 - Article
AN - SCOPUS:85136154344
SN - 0035-8711
VL - 515
SP - 3126
EP - 3143
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -