Constraining Galaxy Overdensities around Three z ∼ 6.5 Quasars with ALMA and MUSE

Romain A. Meyer; Roberto Decarli; Fabian Walter; Qiong Li; Ran Wang; Chiara Mazzucchelli; Eduardo Bañados; Emanuele P. Farina; Bram Venemans

doi:10.3847/1538-4357/ac4f67

journal article Open Access Mar 01, 2022

Constraining Galaxy Overdensities around Three z ∼ 6.5 Quasars with ALMA and MUSE

Romain A. Meyer

Roberto Decarli Fabian Walter Qiong Li

Ran Wang

Chiara Mazzucchelli

Eduardo Bañados Emanuele P. Farina Bram Venemans

The Astrophysical Journal Vol. 927 No. 2 pp. 141 · American Astronomical Society

View at Publisher Save 10.3847/1538-4357/ac4f67

Abstract

Abstract
We quantify galaxy overdensities around three high-redshift quasars with known [C ii]158 μm companions: PJ231–20 (z = 6.59), PJ308–21 (z = 6.24), and J0305–3150 (z = 6.61). Recent SCUBA2 imaging revealed the presence of 17 submillimeter galaxies (SMGs) with sky separations 0.′7 < θ < 2.′4 from these three quasars. We present ALMA Band 6 follow-up observations of these SCUBA2-selected SMGs to confirm their nature and redshift. We also search for continuum-undetected [C ii]158 μm emitters in the ALMA pointings and make use of archival MUSE observations to search for Lyα emitters (LAEs) associated with the quasars. While most of the SCUBA2-selected sources are detected with ALMA in the continuum, no [C ii]158 μm line emission could be detected, indicating that they are not at the quasar redshifts. Based on the serendipitous detection of CO 7–6 and [C i]809 μm emission lines, we find that four SMGs in the field of PJ231–20 are at z ∼ 2.4, which is coincident with the redshift of an Mg ii absorber in the quasar rest-frame UV spectrum. We report the discovery of two LAEs within <0.6 cMpc of PJ231–20 at the same redshift, indicating an LAE overdensity around this quasar. Taken together, these observations provide new constraints on the large-scale excess of Lyα- and [C ii]158 μm-emitting galaxies around z > 6 quasars and suggest that only wide-field observations, such as MUSE, ALMA, or JWST mosaics, can reveal a comprehensive picture of large-scale structure around quasars in the first billion years of the universe.

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Cited By

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Quasars and the Intergalactic Medium at Cosmic Dawn

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Metrics

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Citations

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References

Details

Published: Mar 01, 2022
Vol/Issue: 927(2)
Pages: 141
License: View

Authors

MOE Key Laboratory of Macromolecular Synthesis and Functionalization Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Department of Polymer Science and Engineering Zhejiang University 38 Zheda Road Hangzhou 310027 P. R. China

Funding

Horizon 2020 ERC Advanced Grant Award: 740246

Cite This Article

Romain A. Meyer, Roberto Decarli, Fabian Walter, et al. (2022). Constraining Galaxy Overdensities around Three z ∼ 6.5 Quasars with ALMA and MUSE. The Astrophysical Journal, 927(2), 141. https://doi.org/10.3847/1538-4357/ac4f67

Constraining Galaxy Overdensities around Three z ∼ 6.5 Quasars with ALMA and MUSE

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