Overdensities of submillimetre-bright sources around candidate protocluster cores selected from the South Pole Telescope survey
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Overdensities of submillimetre-bright sources around candidate protocluster cores selected from the South Pole Telescope survey. / Wang, George C. P.; Hill, Ryley; Chapman, S. C.; Weiss, A.; Scott, Douglas; Apostolovski, Yordanka; Aravena, Manuel; Archipley, Melanie Ann; Bethermin, Matthieu; Canning, R. E. A.; De Breuck, Carlos; Dong, Chenxing; Everett, W. B.; Gonzalez, Anthony; Greve, Thomas R.; Hayward, Christopher C.; Hezaveh, Yashar; Jarugula, Sreevani; Marrone, D. P.; Phadke, Kedar A.; Reuter, Cassie A.; Rotermund, K. M.; Spilker, Justin S.; Vieira, Joaquin D.
In: Monthly Notices of the Royal Astronomical Society, Vol. 508, No. 3, 22.12.2021, p. 3754-3770.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Overdensities of submillimetre-bright sources around candidate protocluster cores selected from the South Pole Telescope survey
AU - Wang, George C. P.
AU - Hill, Ryley
AU - Chapman, S. C.
AU - Weiss, A.
AU - Scott, Douglas
AU - Apostolovski, Yordanka
AU - Aravena, Manuel
AU - Archipley, Melanie Ann
AU - Bethermin, Matthieu
AU - Canning, R. E. A.
AU - De Breuck, Carlos
AU - Dong, Chenxing
AU - Everett, W. B.
AU - Gonzalez, Anthony
AU - Greve, Thomas R.
AU - Hayward, Christopher C.
AU - Hezaveh, Yashar
AU - Jarugula, Sreevani
AU - Marrone, D. P.
AU - Phadke, Kedar A.
AU - Reuter, Cassie A.
AU - Rotermund, K. M.
AU - Spilker, Justin S.
AU - Vieira, Joaquin D.
PY - 2021/12/22
Y1 - 2021/12/22
N2 - We present APEX-LABOCA 870-mu m observations of the fields surrounding the nine brightest high-redshift unlensed objects discovered in the South Pole Telescope's (SPT) 2500 deg(2) survey. Initially seen as point sources by SPT's 1-arcmin beam, the 19-arcsec resolution of our new data enables us to deblend these objects and search for submillimetre (submm) sources in the surrounding fields. We find a total of 98 sources above a threshold of 3.7 sigma in the observed area of 1300 arcmin(2), where the bright central cores resolve into multiple components. After applying a radial cut to our LABOCA sources to achieve uniform sensitivity and angular size across each of the nine fields, we compute the cumulative and differential number counts and compare them to estimates of the background, finding a significant overdensity of delta approximate to 10 at S-8(70) = 14 mJy. The large overdensities of bright submm sources surrounding these fields suggest that they could be candidate protoclusters undergoing massive star formation events. Photometric and spectroscopic redshifts of the unlensed central objects range from z =3 to 7, implying a volume density of star-forming protoclusters of approximately 0.1 Gpc(-3). If the surrounding submm sources in these fields are at the same redshifts as the central objects, then the total star formation rates of these candidate protoclusters reach 10 000 M-circle dot yr(-1), making them much more active at these redshifts than seen so far in either simulations or observations.
AB - We present APEX-LABOCA 870-mu m observations of the fields surrounding the nine brightest high-redshift unlensed objects discovered in the South Pole Telescope's (SPT) 2500 deg(2) survey. Initially seen as point sources by SPT's 1-arcmin beam, the 19-arcsec resolution of our new data enables us to deblend these objects and search for submillimetre (submm) sources in the surrounding fields. We find a total of 98 sources above a threshold of 3.7 sigma in the observed area of 1300 arcmin(2), where the bright central cores resolve into multiple components. After applying a radial cut to our LABOCA sources to achieve uniform sensitivity and angular size across each of the nine fields, we compute the cumulative and differential number counts and compare them to estimates of the background, finding a significant overdensity of delta approximate to 10 at S-8(70) = 14 mJy. The large overdensities of bright submm sources surrounding these fields suggest that they could be candidate protoclusters undergoing massive star formation events. Photometric and spectroscopic redshifts of the unlensed central objects range from z =3 to 7, implying a volume density of star-forming protoclusters of approximately 0.1 Gpc(-3). If the surrounding submm sources in these fields are at the same redshifts as the central objects, then the total star formation rates of these candidate protoclusters reach 10 000 M-circle dot yr(-1), making them much more active at these redshifts than seen so far in either simulations or observations.
KW - galaxies: abundances
KW - galaxies: clusters: general
KW - galaxies: high-redshift
KW - submillimetre: galaxies
KW - COSMOLOGY LEGACY SURVEY
KW - FAR-INFRARED PROPERTIES
KW - LARGE-SCALE STRUCTURE
KW - GALAXY CLUSTER
KW - STAR-FORMATION
KW - BOLOMETER CAMERA
KW - HERSCHEL-SPIRE
KW - ALMA SURVEY
KW - REDSHIFT DISTRIBUTION
KW - MILLIMETER-BRIGHT
U2 - 10.1093/mnras/stab2800
DO - 10.1093/mnras/stab2800
M3 - Journal article
VL - 508
SP - 3754
EP - 3770
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 3
ER -
ID: 299752366