Detection of companion galaxies around hot dust-obscured hyper-luminous galaxy W0410-0913

M. Ginolfi (), E. Piconcelli, L. Zappacosta, G. C. Jones, L. Pentericci, R. Maiolino, A. Travascio, N. Menci, S. Carniani, F. Rizzo, F. Arrigoni Battaia, S. Cantalupo, C. De Breuck, L. Graziani, K. Knudsen, P. Laursen, V. Mainieri, R. Schneider, F. Stanley, R. Valiante and A. Verhamme
Additional contact information
M. Ginolfi: European Southern Observatory
E. Piconcelli: INAF—Osservatorio Astronomico di Roma
L. Zappacosta: INAF—Osservatorio Astronomico di Roma
G. C. Jones: University of Oxford
L. Pentericci: INAF—Osservatorio Astronomico di Roma
R. Maiolino: University of Cambridge
A. Travascio: University of Milan Bicocca
N. Menci: INAF—Osservatorio Astronomico di Roma
S. Carniani: Scuola Normale Superiore
F. Rizzo: Cosmic Dawn Center (DAWN)
F. Arrigoni Battaia: Max-Planck-Institut für Astrophysik
S. Cantalupo: University of Milan Bicocca
C. De Breuck: European Southern Observatory
L. Graziani: Sapienza, Universita di Roma
K. Knudsen: Chalmers University of Technology, Onsala Space Observatory
P. Laursen: Cosmic Dawn Center (DAWN)
V. Mainieri: European Southern Observatory
R. Schneider: Sapienza, Universita di Roma
F. Stanley: Sorbonne Université, UPMC Université Paris 6 & CNRS, UMR 7095, Institut d’Astrophysique de Paris
R. Valiante: INAF—Osservatorio Astronomico di Roma
A. Verhamme: Université de Genève

Nature Communications, 2022, vol. 13, issue 1, 1-15

Abstract: Abstract The phase transition between galaxies and quasars is often identified with the rare population of hyper-luminous, hot dust-obscured galaxies. Galaxy formation models predict these systems to grow via mergers, that can deliver large amounts of gas toward their centers, induce intense bursts of star formation and feed their supermassive black holes. Here we report the detection of 24 galaxies emitting Lyman-α emission on projected physical scales of about 400 kpc around the hyper-luminous hot dust-obscured galaxy W0410-0913, at redshift z = 3.631, using Very Large Telescope observations. While this indicates that W0410-0913 evolves in a very dense environment, we do not find clear signs of mergers that could sustain its growth. Data suggest that if mergers occurred, as models expect, these would involve less massive satellites, with only a moderate impact on the internal interstellar medium of W0410-0913, which is sustained by a rotationally-supported fast-rotating molecular disk, as Atacama Large Millimeter Array observations suggest.

Date: 2022
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DOI: 10.1038/s41467-022-32297-x

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