The mysterious morphology of MRC0943-242 as revealed by ALMA and MUSE
Artikel i vetenskaplig tidskrift, 2016

© 2016 ESO. We present a pilot study of the z = 2.923 radio galaxy MRC0943-242, where we combine information from ALMA and MUSE data cubes for the first time. Even with modest integration times, we disentangle the AGN and starburst dominated components. These data reveal a highly complex morphology as the AGN, starburst, and molecular gas components show up as widely separated sources in dust continuum, optical continuum, and CO line emission observations. CO(1-0) and CO(8-7) line emission suggest that there is a molecular gas reservoir offset from both the dust and the optical continuum that is located ∼90 kpc from the AGN. The UV line emission has a complex structure in emission and absorption. The line emission is mostly due to a large scale ionisation cone energised by the AGN, and a Lyα emitting bridge of gas between the radio galaxy and a heavily star-forming set of components. Strangely, the ionisation cone has no Lyα emission. We find this is due to an optically thick layer of neutral gas with unity covering fraction spread out over a region of at least ∼100 kpc from the AGN. Other less thick absorption components are associated with Lyα emitting gas within a few tens of kpc from the radio galaxy and are connected by a bridge of emission. We speculate that this linear structure of dust, Lyα and CO emission, and the redshifted absorption seen in the circum nuclear region may represent an accretion flow feeding gas into this massive AGN host galaxy.

Galaxies: high-redshift

Galaxies: evolution

Galaxies: halos

Galaxies: ISM

Galaxies: active


B. Gullberg

European Southern Observatory (ESO)

C. De Breuck

European Southern Observatory (ESO)

M. Lehnert

Universite Pierre et Marie Curie

J. Vernet

European Southern Observatory (ESO)

R. Bacon

Universite Claude Bernard Lyon 1

Guillaume Drouart

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

B. Emonts

CSIC-INTA - Centro de Astrobiologia (CAB)

A. Galametz

Max Planck-institutet

R. J. Ivison

University of Edinburgh

European Southern Observatory (ESO)

N. Nesvadba

Universite Paris-Sud XI

J. Richard

Universite Claude Bernard Lyon 1

N. Seymour

Curtin University

D. Stern

Jet Propulsion Laboratory, California Institute of Technology

D. Wylezalek

Johns Hopkins University

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 586


Geovetenskap och miljövetenskap