Overdensities of Submillimetre-Bright Sources around Candidate Protocluster Cores Selected from the South Pole Telescope Survey
We present APEX-LABOCA 870 micron observations of the fields surrounding the nine brightest, high-redshift, unlensed objects discovered in the South Pole Telescope's (SPT) 2500 square degrees survey. Initially seen as point sources by SPT's 1-arcmin beam, the 19-arcsec resolution of our ne...
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ftccsdartic:oai:HAL:hal-02973228v1 2023-05-15T18:22:11+02:00 Overdensities of Submillimetre-Bright Sources around Candidate Protocluster Cores Selected from the South Pole Telescope Survey Wang, George Hill, Ryley Chapman, S.C. Weiß, A. Scott, Douglas Aravena, Manuel Archipley, Melanie Ann Béthermin, Matthieu De Breuck, Carlos Canning, R.E.A. Dong, Chenxing Everett, W.B. Gonzalez, Anthony Greve, Thomas R. Hayward, Christopher C. Hezaveh, Yashar Marrone, D.P. Jarugula, Sreevani Phadke, Kedar A. Reuter, Cassie A. Spilker, Justin S. Vieira, Joaquin D. Laboratoire d'Astrophysique de Marseille (LAM) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS) 2020-10-20 https://hal.archives-ouvertes.fr/hal-02973228 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/arxiv/2010.02909 hal-02973228 https://hal.archives-ouvertes.fr/hal-02973228 ARXIV: 2010.02909 INSPIRE: 1821643 https://hal.archives-ouvertes.fr/hal-02973228 2020 [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] info:eu-repo/semantics/preprint Preprints, Working Papers, . 2020 ftccsdartic 2021-11-07T00:41:17Z We present APEX-LABOCA 870 micron observations of the fields surrounding the nine brightest, high-redshift, unlensed objects discovered in the South Pole Telescope's (SPT) 2500 square degrees 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 square arcminutes, 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 approximately 10 at 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 3 to 7, implying a volume density of star-forming protoclusters of approximately 0.1 per giga-parsec cube. 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 solar masses per year, making them much more active at these redshifts than what has been seen so far in both simulations and observations. Report South pole Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) South Pole |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
spellingShingle |
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Wang, George Hill, Ryley Chapman, S.C. Weiß, A. Scott, Douglas Aravena, Manuel Archipley, Melanie Ann Béthermin, Matthieu De Breuck, Carlos Canning, R.E.A. Dong, Chenxing Everett, W.B. Gonzalez, Anthony Greve, Thomas R. Hayward, Christopher C. Hezaveh, Yashar Marrone, D.P. Jarugula, Sreevani Phadke, Kedar A. Reuter, Cassie A. Spilker, Justin S. Vieira, Joaquin D. Overdensities of Submillimetre-Bright Sources around Candidate Protocluster Cores Selected from the South Pole Telescope Survey |
topic_facet |
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
description |
We present APEX-LABOCA 870 micron observations of the fields surrounding the nine brightest, high-redshift, unlensed objects discovered in the South Pole Telescope's (SPT) 2500 square degrees 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 square arcminutes, 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 approximately 10 at 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 3 to 7, implying a volume density of star-forming protoclusters of approximately 0.1 per giga-parsec cube. 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 solar masses per year, making them much more active at these redshifts than what has been seen so far in both simulations and observations. |
author2 |
Laboratoire d'Astrophysique de Marseille (LAM) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS) |
format |
Report |
author |
Wang, George Hill, Ryley Chapman, S.C. Weiß, A. Scott, Douglas Aravena, Manuel Archipley, Melanie Ann Béthermin, Matthieu De Breuck, Carlos Canning, R.E.A. Dong, Chenxing Everett, W.B. Gonzalez, Anthony Greve, Thomas R. Hayward, Christopher C. Hezaveh, Yashar Marrone, D.P. Jarugula, Sreevani Phadke, Kedar A. Reuter, Cassie A. Spilker, Justin S. Vieira, Joaquin D. |
author_facet |
Wang, George Hill, Ryley Chapman, S.C. Weiß, A. Scott, Douglas Aravena, Manuel Archipley, Melanie Ann Béthermin, Matthieu De Breuck, Carlos Canning, R.E.A. Dong, Chenxing Everett, W.B. Gonzalez, Anthony Greve, Thomas R. Hayward, Christopher C. Hezaveh, Yashar Marrone, D.P. Jarugula, Sreevani Phadke, Kedar A. Reuter, Cassie A. Spilker, Justin S. Vieira, Joaquin D. |
author_sort |
Wang, George |
title |
Overdensities of Submillimetre-Bright Sources around Candidate Protocluster Cores Selected from the South Pole Telescope Survey |
title_short |
Overdensities of Submillimetre-Bright Sources around Candidate Protocluster Cores Selected from the South Pole Telescope Survey |
title_full |
Overdensities of Submillimetre-Bright Sources around Candidate Protocluster Cores Selected from the South Pole Telescope Survey |
title_fullStr |
Overdensities of Submillimetre-Bright Sources around Candidate Protocluster Cores Selected from the South Pole Telescope Survey |
title_full_unstemmed |
Overdensities of Submillimetre-Bright Sources around Candidate Protocluster Cores Selected from the South Pole Telescope Survey |
title_sort |
overdensities of submillimetre-bright sources around candidate protocluster cores selected from the south pole telescope survey |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.archives-ouvertes.fr/hal-02973228 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
https://hal.archives-ouvertes.fr/hal-02973228 2020 |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/2010.02909 hal-02973228 https://hal.archives-ouvertes.fr/hal-02973228 ARXIV: 2010.02909 INSPIRE: 1821643 |
_version_ |
1766201548405211136 |