The z = 7.54 Quasar ULAS J1342+0928 Is Hosted by a Galaxy Merger

Eduardo Bañados, Mladen Novak, Marcel Neeleman, Fabian Walter, Roberto Decarli, Bram P. Venemans, Chiara Mazzucchelli, Chris Carilli, Feige Wang, Xiaohui Fan, Emanuele P. Farina, Hans Walter Rix

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


We present ALMA 0.″28 × 0.″20 (1.4 kpc × 1.0 kpc) resolution observations of the [C ii] 158 μm line and underlying dust continuum in the host galaxy of the most distant quasar currently known, ULAS J1342+0928 at z = 7.5413. Both the [C ii] and continuum are detected and spatially resolved. The [C ii] line is ∼1.5 times more extended than the continuum emission, showing an elongated and complex structure of approximately 3.2 kpc × 6.4 kpc. Two separate peaks are clearly seen (6σ each) in three 100 km s-1 width [C ii] channel maps. The velocity field of the [C ii] gas does not show evidence of a coherent rotation field but rather chaotic motion reminiscent of an ongoing merger.

Original languageEnglish (US)
Article numberL23
JournalAstrophysical Journal Letters
Issue number1
StatePublished - Aug 10 2019


  • cosmology: observations
  • early universe
  • galaxies: ISM
  • galaxies: kinematics and dynamics
  • quasars: individual (ULAS J134208.10+092838.35)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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