Speaker
Quentin SALOME
(LERMA, Observatoire de Paris)
Description
Recent studies suggest that AGN can regulate the gas accretion and thus slow
down star formation (negative feedback). However, evidence of AGN positive
feedback is also invoked in a few radio galaxies (eg. Centaurus A, Minkowski's
Object, 3C 285, ...).
I will present a multi-wavelength study of the northern filaments of Centaurus A.
These filaments of gas and young stars extend on scales up to 15 kpc, aligned with
the radio-jet. Along the radio jet, CO emission has been detected in a HI shell
(Schiminovich et al. 1994, Charmandaris et al. 2000). We also detected CO in a
large area along the filaments.
By confronting the CO data to archival Herschel-FIR and GALEX-FUV data, we
determine that the gas in the filaments is very inefficient to form stars (with
depletion time of a few Gyr). This is strengthened by archival ALMA data that
revealed the presence of unresolved CO(2-1) emitting clumps. We showed that
these clumps are probably not gravitationally bound.
From our recent APEX data, we can now constrain the molecular gas dynamics in
the filaments. By comparison with neutral HI (from VLA) and ionised gas (from
VIMOS and MUSE), we confirm evidences of a dynamical effect of the radio jet on
the gas along the jet direction. We also lay the foundations for upcoming high
angular resolution ALMA data at large scales (in the scheduling queue).
Primary author
Quentin SALOME
(LERMA, Observatoire de Paris)
Co-authors
Dr
Françoise COMBES
(LERMA, Observatoire de Paris)
Dr
Philippe SALOME
(LERMA, Observatoire de Paris)
Dr
Stephen HAMER
(CRAL, Observatoire de Lyon)
