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Molecular outflow and feedback in the obscured quasar XID2028 revealed by ALMA

Brusa, M.; Cresci, G.; Daddi, E.; Paladino, R.; Perna, M.; Bongiorno, A.; Lusso, E.; Sargent, M.T.; Casasola, V.; Feruglio, C.; Fraternali, F.; Georgiev, I.; Mainieri, V.; Carniani, S.; Comastri, A.; Duras, F.; Fiore, F.; Mannucci, F.; Marconi, A.; Piconcelli, E.; Zamorani, G.; Gilli, R.; La Franca, F.; Lanzuisi, G.; Lutz, D.; Santini, P.; Scoville, N.Z.; Vignali, C.; Vito, F.; Rabien, S.; Busoni, L.; Bonaglia, M.

Molecular outflow and feedback in the obscured quasar XID2028 revealed by ALMA Thumbnail


Authors

M. Brusa

G. Cresci

E. Daddi

R. Paladino

M. Perna

A. Bongiorno

M.T. Sargent

V. Casasola

C. Feruglio

F. Fraternali

I. Georgiev

V. Mainieri

S. Carniani

A. Comastri

F. Duras

F. Fiore

F. Mannucci

A. Marconi

E. Piconcelli

G. Zamorani

R. Gilli

F. La Franca

G. Lanzuisi

D. Lutz

P. Santini

N.Z. Scoville

C. Vignali

F. Vito

S. Rabien

L. Busoni

M. Bonaglia



Abstract

We imaged, with ALMA and ARGOS/LUCI, the molecular gas and dust and stellar continuum in XID2028, which is an obscured quasi-stellar object (QSO) at z = 1.593, where the presence of a massive outflow in the ionised gas component traced by the [OIII]5007 emission has been resolved up to 10 kpc. This target represents a unique test case to study QSO feedback in action at the peak epoch of AGN-galaxy co-evolution. The QSO was detected in the CO(5 − 4) transition and in the 1.3 mm continuum at ~30 and ~20σ significance, respectively; both emissions are confined in the central (<2 kpc) radius area. Our analysis suggests the presence of a fast rotating molecular disc (v ~ 400 km s−1) on very compact scales well inside the galaxy extent seen in the rest-frame optical light (~10 kpc, as inferred from the LUCI data). Adding available measurements in additional two CO transitions, CO(2 − 1) and CO(3 − 2), we could derive a total gas mass of ~1010 M⊙, thanks to a critical assessment of CO excitation and the comparison with the Rayleigh–Jeans continuum estimate. This translates into a very low gas fraction (<5%) and depletion timescales of 40–75 Myr, reinforcing the result of atypical gas consumption conditions in XID2028, possibly because of feedback effects on the host galaxy. Finally, we also detect the presence of high velocity CO gas at ~5σ, which we interpret as a signature of galaxy-scale molecular outflow that is spatially coincident with the ionised gas outflow. XID2028 therefore represents a unique case in which the measurement of total outflowing mass, of ~500–800 M⊙ yr−1 including the molecular and atomic components in both the ionised and neutral phases, was attempted for a high-z QSO.

Citation

Brusa, M., Cresci, G., Daddi, E., Paladino, R., Perna, M., Bongiorno, A., …Bonaglia, M. (2018). Molecular outflow and feedback in the obscured quasar XID2028 revealed by ALMA. Astronomy & Astrophysics, 612, Article A29. https://doi.org/10.1051/0004-6361/201731641

Journal Article Type Article
Acceptance Date Dec 12, 2017
Online Publication Date Apr 16, 2018
Publication Date Apr 16, 2018
Deposit Date Apr 26, 2018
Publicly Available Date Apr 26, 2018
Journal Astronomy and astrophysics.
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 612
Article Number A29
DOI https://doi.org/10.1051/0004-6361/201731641

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Copyright Statement
Reproduced with permission from Astronomy & Astrophysics, © ESO 2018





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