| Autor: |
Meyer, Romain A., Decarli, Roberto, Walter, Fabian, Li, Qiong, Wang, Ran, Mazzucchelli, Chiara, Bañados, Eduardo, Farina, Emanuele P., Venemans, Bram |
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| Zdroj: |
Astrophysical Journal; 3/8/2022, Vol. 927 Issue 2, p1-22, 22p |
| Abstrakt: |
We quantify galaxy overdensities around three high-redshift quasars with known [C ii ]158 ÎĽ m companions: PJ231â€"20 (z = 6.59), PJ308â€"21 (z = 6.24), and J0305â€"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 ÎĽ m emitters in the ALMA pointings and make use of archival MUSE observations to search for Ly α emitters (LAEs) associated with the quasars. While most of the SCUBA2-selected sources are detected with ALMA in the continuum, no [C ii ]158 ÎĽ m line emission could be detected, indicating that they are not at the quasar redshifts. Based on the serendipitous detection of CO 7â€"6 and [C i ]809 ÎĽ m emission lines, we find that four SMGs in the field of PJ231â€"20 are at z ⼠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 PJ231â€"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 Ly α - and [C ii ]158 ÎĽ m-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. [ABSTRACT FROM AUTHOR] |
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