Mapping Obscuration to Reionization with ALMA (MORA): 2 mm Efficiently Selects the Highest-redshift Obscured Galaxies
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Mapping Obscuration to Reionization with ALMA (MORA) : 2 mm Efficiently Selects the Highest-redshift Obscured Galaxies. / Casey, Caitlin M.; Zavala, Jorge A.; Manning, Sinclaire M.; Aravena, Manuel; Bethermin, Matthieu; Caputi, Karina I.; Champagne, Jaclyn B.; Clements, David L.; Drew, Patrick; Finkelstein, Steven L.; Fujimoto, Seiji; Hayward, Christopher C.; Dekel, Anton M.; Kokorev, Vasily; del P. Lagos, Claudia; Long, Arianna S.; Magdis, Georgios E.; Man, Allison W. S.; Mitsuhashi, Ikki; Popping, Gergo; Spilker, Justin; Staguhn, Johannes; Talia, Margherita; Toft, Sune; Treister, Ezequiel; Weaver, John R.; Yun, Min.
In: Astrophysical Journal, Vol. 923, No. 2, 215, 20.12.2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Mapping Obscuration to Reionization with ALMA (MORA)
T2 - 2 mm Efficiently Selects the Highest-redshift Obscured Galaxies
AU - Casey, Caitlin M.
AU - Zavala, Jorge A.
AU - Manning, Sinclaire M.
AU - Aravena, Manuel
AU - Bethermin, Matthieu
AU - Caputi, Karina I.
AU - Champagne, Jaclyn B.
AU - Clements, David L.
AU - Drew, Patrick
AU - Finkelstein, Steven L.
AU - Fujimoto, Seiji
AU - Hayward, Christopher C.
AU - Dekel, Anton M.
AU - Kokorev, Vasily
AU - del P. Lagos, Claudia
AU - Long, Arianna S.
AU - Magdis, Georgios E.
AU - Man, Allison W. S.
AU - Mitsuhashi, Ikki
AU - Popping, Gergo
AU - Spilker, Justin
AU - Staguhn, Johannes
AU - Talia, Margherita
AU - Toft, Sune
AU - Treister, Ezequiel
AU - Weaver, John R.
AU - Yun, Min
PY - 2021/12/20
Y1 - 2021/12/20
N2 - We present the characteristics of 2 mm selected sources from the largest Atacama Large Millimeter/submillimeter Array (ALMA) blank-field contiguous survey conducted to date, the Mapping Obscuration to Reionization with ALMA (MORA) survey covering 184 arcmin(2) at 2 mm. Twelve of 13 detections above 5 sigma are attributed to emission from galaxies, 11 of which are dominated by cold dust emission. These sources have a median redshift of < Z(2) (mm)> = 3.6(-0.3)(+0.4) primarily based on optical/near-infrared photometric redshifts with some spectroscopic redshifts, with 77% +/- 11% of sources at z > 3 and 38% +/- 12% of sources at z > 4. This implies that 2 mm selection is an efficient method for identifying the highest-redshift dusty star-forming galaxies (DSFGs). Lower-redshift DSFGs (z < 3) are far more numerous than those at z > 3 yet are likely to drop out at 2 mm. MORA shows that DSFGs with star formation rates in excess of 300 M-circle dot yr(-1) and a relative rarity of similar to 10(-5) Mpc(-3) contribute similar to 30% to the integrated star formation rate density at 3 < z < 6. The volume density of 2 mm selected DSFGs is consistent with predictions from some cosmological simulations and is similar to the volume density of their hypothesized descendants: massive, quiescent galaxies at z > 2. Analysis of MORA sources' spectral energy distributions hint at steeper empirically measured dust emissivity indices than reported in typical literature studies, with = 2.2(-0.4)(+0.5). The MORA survey represents an important step in taking census of obscured star formation in the universe's first few billion years, but larger area 2 mm surveys are needed to more fully characterize this rare population and push to the detection of the universe's first dusty galaxies.
AB - We present the characteristics of 2 mm selected sources from the largest Atacama Large Millimeter/submillimeter Array (ALMA) blank-field contiguous survey conducted to date, the Mapping Obscuration to Reionization with ALMA (MORA) survey covering 184 arcmin(2) at 2 mm. Twelve of 13 detections above 5 sigma are attributed to emission from galaxies, 11 of which are dominated by cold dust emission. These sources have a median redshift of < Z(2) (mm)> = 3.6(-0.3)(+0.4) primarily based on optical/near-infrared photometric redshifts with some spectroscopic redshifts, with 77% +/- 11% of sources at z > 3 and 38% +/- 12% of sources at z > 4. This implies that 2 mm selection is an efficient method for identifying the highest-redshift dusty star-forming galaxies (DSFGs). Lower-redshift DSFGs (z < 3) are far more numerous than those at z > 3 yet are likely to drop out at 2 mm. MORA shows that DSFGs with star formation rates in excess of 300 M-circle dot yr(-1) and a relative rarity of similar to 10(-5) Mpc(-3) contribute similar to 30% to the integrated star formation rate density at 3 < z < 6. The volume density of 2 mm selected DSFGs is consistent with predictions from some cosmological simulations and is similar to the volume density of their hypothesized descendants: massive, quiescent galaxies at z > 2. Analysis of MORA sources' spectral energy distributions hint at steeper empirically measured dust emissivity indices than reported in typical literature studies, with = 2.2(-0.4)(+0.5). The MORA survey represents an important step in taking census of obscured star formation in the universe's first few billion years, but larger area 2 mm surveys are needed to more fully characterize this rare population and push to the detection of the universe's first dusty galaxies.
KW - STAR-FORMING GALAXIES
KW - COSMOLOGY LEGACY SURVEY
KW - DEEP-FIELD-SOUTH
KW - MASSIVE QUIESCENT GALAXIES
KW - DUST CONTINUUM EMISSION
KW - AZTEC MILLIMETER SURVEY
KW - FORMATION RATE DENSITY
KW - DIGITAL SKY SURVEY
KW - C II LINE
KW - SUBMILLIMETER GALAXIES
U2 - 10.3847/1538-4357/ac2eb4
DO - 10.3847/1538-4357/ac2eb4
M3 - Journal article
VL - 923
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 215
ER -
ID: 288787672