A multiwavelength study of a massive, active galaxy at z ∼ 2: Coupling the kinematics of the ionized and molecular gas

Federica Loiacono*, Margherita Talia, Filippo Fraternali, Andrea Cimatti, Enrico M. Di Teodoro, Gabriel B. Caminha

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    We report a multiwavelength study of the massive (M* ≳ 1011M☉), z ∼ 2 star-forming galaxy GMASS 0953, which hosts an obscured AGN. We combined near-infrared observations of the GNIRS, SINFONI and KMOS spectrographs to study the kinematics of the [O III] λ5007 and H α emission lines. Our analysis shows that GMASS 0953 may host an ionized disc extending up to 13 kpc, which rotates at a velocity of Vion = 203+1720 km s−1 at the outermost radius. Evidence of rotation on a smaller scale (R ∼ 1 kpc) arises from the CO(J = 6-5) line. The central velocity VCO = 320+9253 km s−1 traced by the molecular gas is higher than Vion, suggesting that the galaxy harbours a multiphase disc with a rotation curve that peaks in the very central regions. The galaxy appears well located on the z = 0 baryonic Tully-Fisher relation. We also discuss the possibility that the [O III] λ5007 and H α velocity gradients are due to a galactic-scale wind. Besides, we found evidence of an AGN-driven outflow traced by a broad blueshifted wing affecting the [O III] λ5007 line, which presents a velocity offset Δv = −535 ± 152 km s−1 from the systemic velocity. Because of the short depletion time-scale (τdep ∼ 108 yr) due to gas ejection and gas consumption by star formation activity, GMASS 0953 may likely evolve into a passive galaxy. However, the role of the AGN in depleting the gas reservoir of the galaxy is quite unclear because of the uncertainties affecting the outflow rate.

    Original languageEnglish
    Pages (from-to)681-698
    Number of pages18
    JournalMonthly Notices of the Royal Astronomical Society
    Volume489
    Issue number1
    DOIs
    Publication statusPublished - 11 Oct 2019

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