Skip to main content

Research Repository

Advanced Search

A magnified view of circumnuclear star formation and feedback around an active galactic nucleus at z = 2.6

Geach, J. E.; Ivison, R. J.; Dye, S.; Oteo, I.


J. E. Geach

R. J. Ivison

Associate Professor

I. Oteo


We present Atacama Large Millimeter/submillimeter Array observations of an intrinsically radio-bright (L 1.4 GHz = (1.7 ± 0.1) × 1025 W Hz−1) and infrared luminous (L IR ≈ 1013 L ⊙) galaxy at z = 2.6. The infrared-to-radio luminosity ratio, q = 1.8, indicates the presence of a radio-loud active galactic nucleus (AGN). Gravitational lensing by two foreground galaxies at z ≈ 0.2 provides access to physical scales of approximately 360 pc, and we resolve a 2.5 kpc radius ring of star-forming molecular gas, traced by atomic carbon C i (1 → 0) and carbon monoxide CO (J = 4 → 3). We also detect emission from the cyanide radical, CN (N = 4 → 3). With a velocity width of 680 km s−1, this traces dense molecular gas traveling at velocities nearly a factor of two larger than the rotation speed of the molecular ring. While this could indicate the presence of a dynamical and photochemical interaction between the AGN and molecular interstellar medium on scales of a few 100 pc, ongoing feedback is unlikely to have a significant impact on the assembly of stellar mass in the molecular ring, given the ~10 s Myr depletion timescale due to star formation.

Journal Article Type Article
Publication Date Sep 20, 2018
Journal The Astrophysical Journal
Print ISSN 2041-8213
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 866
Issue 1
Pages 1-7
APA6 Citation Geach, J. E., Ivison, R. J., Dye, S., & Oteo, I. (2018). A magnified view of circumnuclear star formation and feedback around an active galactic nucleus at z = 2.6.
Keywords galaxies: active – galaxies: evolution – galaxies: individual (9io9) – galaxies: nuclei – radio continuum: galaxies – submillimeter: galaxies
Publisher URL


A Magnified View of Circumnuclear Star Formation and Feedback around an Active Galactic Nucleus at z = 2.6 (1.7 Mb)

You might also like

Downloadable Citations