ALMACAL VIII: a pilot survey for untargeted extragalactic CO emission lines in deep ALMA calibration data
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ALMACAL VIII : a pilot survey for untargeted extragalactic CO emission lines in deep ALMA calibration data. / Hamanowicz, Aleksandra; Zwaan, Martin A.; Peroux, Celine; Lagos, Claudia del P.; Klitsch, Anne; Ivison, Rob J.; Biggs, Andrew D.; Szakacs, Roland; Fresco, Alejandra.
In: Monthly Notices of the Royal Astronomical Society, Vol. 519, No. 1, 01.02.2023, p. 34-49.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - ALMACAL VIII
T2 - a pilot survey for untargeted extragalactic CO emission lines in deep ALMA calibration data
AU - Hamanowicz, Aleksandra
AU - Zwaan, Martin A.
AU - Peroux, Celine
AU - Lagos, Claudia del P.
AU - Klitsch, Anne
AU - Ivison, Rob J.
AU - Biggs, Andrew D.
AU - Szakacs, Roland
AU - Fresco, Alejandra
PY - 2023/2/1
Y1 - 2023/2/1
N2 - We present a pilot, untargeted extragalactic carbon monoxide (CO) emission-line survey using ALMACAL, a project utilizing ALMA calibration data for scientific purposes. In 33 deep (T-exp' > 40 min) ALMACAL fields, we report six CO emission-line detections above S/N > 4, one-third confirmed by MUSE observations. With this pilot survey, we probe a cosmologically significant volume of similar to 10(5) cMpc(3), widely distributed over many pointings in the southern sky, making the survey largely insusceptible to the effects of cosmic variance. We derive the redshift probability of the CO detections using probability functions from the SHARK semi-analytical model of galaxy formation. By assuming typical CO excitations for the detections, we put constraints on the cosmic molecular gas mass density evolution over the redshift range 0 < z < 1.5. The results of our pilot survey are consistent with the findings of other untargeted emission-line surveys and the theoretical model predictions and currently cannot rule out a non-evolving molecular gas mass density. Our study demonstrates the potential of using ALMA calibrator fields as a multi-sightline untargeted CO emission-line survey. Applying this approach to the full ALMACAL database will provide an accurate, free of cosmic variance, measurement of the molecular luminosity function as a function of redshift.
AB - We present a pilot, untargeted extragalactic carbon monoxide (CO) emission-line survey using ALMACAL, a project utilizing ALMA calibration data for scientific purposes. In 33 deep (T-exp' > 40 min) ALMACAL fields, we report six CO emission-line detections above S/N > 4, one-third confirmed by MUSE observations. With this pilot survey, we probe a cosmologically significant volume of similar to 10(5) cMpc(3), widely distributed over many pointings in the southern sky, making the survey largely insusceptible to the effects of cosmic variance. We derive the redshift probability of the CO detections using probability functions from the SHARK semi-analytical model of galaxy formation. By assuming typical CO excitations for the detections, we put constraints on the cosmic molecular gas mass density evolution over the redshift range 0 < z < 1.5. The results of our pilot survey are consistent with the findings of other untargeted emission-line surveys and the theoretical model predictions and currently cannot rule out a non-evolving molecular gas mass density. Our study demonstrates the potential of using ALMA calibrator fields as a multi-sightline untargeted CO emission-line survey. Applying this approach to the full ALMACAL database will provide an accurate, free of cosmic variance, measurement of the molecular luminosity function as a function of redshift.
KW - ISM: molecules
KW - galaxies: evolution
KW - galaxies: ISM
KW - galaxies: star formation.
KW - MOLECULAR GAS CONTENT
KW - SPECTROSCOPIC SURVEY
KW - STAR-FORMATION
KW - LUMINOSITY FUNCTIONS
KW - COSMIC EVOLUTION
KW - PHYSICAL-PROPERTIES
KW - INTERSTELLAR-MEDIUM
KW - GALAXY FORMATION
KW - HIGH-REDSHIFT
KW - BLIND SEARCH
U2 - 10.1093/mnras/stac3159
DO - 10.1093/mnras/stac3159
M3 - Journal article
VL - 519
SP - 34
EP - 49
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 1
ER -
ID: 337793741