2021MNRAS.506.2551V -
Mon. Not. R. Astron. Soc., 506, 2551-2573 (2021/September-2)
Where infall meets outflows: turbulent dissipation probed by CH+ and Lyα in the starburst/AGN galaxy group SMM J02399-0136 at z ∼ 2.8.
VIDAL-GARCIA A., FALGARONE E., ARRIGONI BATTAIA F., GODARD B., IVISON R.J., ZWAAN M.A., HERRERA C., FRAYER D., ANDREANI P., LI Q. and GAVAZZI R.
Abstract (from CDS):
We present a comparative analysis of the CH+(1-0) and Lyα lines, observed with the Atacama Large Millimeter Array and Keck telescope, respectively, in the field of the submillimetre-selected galaxy SMM J02399-0136 at z ∼ 2.8, which comprises a heavily obscured starburst galaxy and a broad absorption line quasar, immersed in a large Lyα nebula. This comparison highlights the critical role played by turbulence in channelling the energy across gas phases and scales, splitting the energy trail between hot/thermal and cool/turbulent phases in the circumgalactic medium (CGM). The unique chemical and spectroscopic properties of CH+ are used to infer the existence of a massive (∼3.5 x 1010 M☉), highly turbulent reservoir of diffuse molecular gas of radius ∼20 kpc coinciding with the core of the Lyα nebula. The whole cool and cold CGM is shown to be inflowing towards the galaxies at a velocity ∼ 400 km s–1. Several kpc-scale shocks are detected tentatively in CH+ emission. Their linewidth and specific location in space and velocity with respect to the high-velocity Lyα emission suggest that they lie at the interface of the inflowing CGM and the high-velocity outflowing gas. They signpost the feeding of CGM turbulence by active galactic nuclei- and stellar-driven outflows. The mass and energy budgets of the CGM require net mass accretion at a rate commensurate with the star formation rate. From this similarity, we infer that the merger-driven burst of star formation and black-hole growth are ultimately fuelled by large-scale gas accretion.
Abstract Copyright:
© 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society
Journal keyword(s):
molecular processes - turbulence - galaxies: formation - galaxies: high-redshift - galaxies: intergalactic medium - galaxies: starburst
Status at CDS
:
Examining the need for a new acronym.
Simbad objects:
10
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