Evidence for feedback in action from the molecular gas content in the z ∼ 1.6 outflowing QSO XID2028

被引：48

作者：

Brusa, M. ^{[1
,2
,3
]}

Feruglio, C. ^{[4
,5
,6
]}

Cresci, G. ^{[7
]}

Mainieri, V. ^{[8
]}

Sargent, M. T. ^{[9
]}

Perna, M. ^{[1
,3
]}

Santini, P. ^{[6
]}

Vito, F. ^{[1
,3
]}

Marconi, A. ^{[10
]}

Merloni, A. ^{[2
]}

Lutz, D. ^{[2
]}

Piconcelli, E. ^{[6
]}

Lanzuisi, G. ^{[1
,3
]}

Maiolino, R. ^{[11
]}

Rosario, D. ^{[2
]}

Daddi, E. ^{[12
]}

Bongiorno, A. ^{[6
]}

Fiore, F. ^{[6
]}

Lusso, E. ^{[7
]}

机构：

[1] Univ Bologna, Dipartimento Fis & Astron, I-40127 Bologna, Italy

[2] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[3] INAF Osservatorio Astron Bologna, I-40127 Bologna, Italy

[4] Inst Radio Astron Millimetr, F-38406 St Martin Dheres, France

[5] Scuola Normale Super Pisa, I-56126 Pisa, Italy

[6] INAF Osservatorio Astron Roma, I-00044 Monte Porzio Catone, RM, Italy

[7] INAF Osservatorio Astron Arcetri, I-50125 Florence, Italy

[8] European So Observ, D-85748 Garching, Germany

[9] Univ Sussex, Dept Phys & Astron, Ctr Astron, Brighton BN1 9QH, E Sussex, England

[10] Univ Firenze, Dipartimento Astron & Sci Spazio, I-50125 Florence, Italy

[11] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[12] CEA DSM CNRS Univ Paris Diderot, CEA Saclay, IRFU Serv Astrophys, Lab AIM, F-91191 Gif Sur Yvette, France

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 578卷

关键词：

galaxies: active; galaxies: star formation; quasars: individual: XID2028; galaxies: ISM; STAR-FORMATION RATE; BLACK-HOLE ACCRETION; SPECTRAL ENERGY-DISTRIBUTION; CO-TO-H-2 CONVERSION FACTOR; QUASAR HOST GALAXIES; FORMING GALAXIES; ULTRALUMINOUS GALAXIES; POSITIVE FEEDBACK; SCALING RELATIONS; OBSCURED QUASARS;

D O I：

10.1051/0004-6361/201425491

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. Gas outflows are believed to play a pivotal role in shaping galaxies, as they regulate both star formation and black hole growth. Despite their ubiquitous presence, the origin and the acceleration mechanism of these powerful and extended winds is not yet understood. Direct observations of the cold gas component in objects with detected outflows at other wavelengths are needed to assess the impact of the outflow on the host galaxy interstellar medium (ISM). Methods. We observed with the Plateau de Bure Interferometer an obscured quasar at z similar to 1.5, XID2028, for which the presence of an ionized outflow has been unambiguously signalled by NIR spectroscopy. The detection of (CO)-C-12(3-2) emission in this source allows us to infer the molecular gas content and compare it to the ISM mass derived from the dust emission. We then analyzed the results in the context of recent insights on scaling relations, which describe the gas content of the overall population of star-forming galaxies at a similar redshifts. Results. The star formation efficiency (similar to 100) and gas mass (M-gas = 2.1-9.5 x 10(10) M-circle dot) inferred from the CO(3-2) line depend on the underlying assumptions on the excitation of the transition and the CO-to-H2 conversion factor. However, the combination of this information and the ISM mass estimated from the dust mass suggests that the ISM / gas content of XID2028 is significantly lower than expected for its observed M-*(,) sSFR and redshift, based on the most up-to-date calibrations (with gas fraction < 20% and depletion timescale < 340 Myr). Conclusions. Overall, the constraints we obtain from the far infrared and millimeter data suggest that we are observing QSO feedback able to remove the gas from the host.

引用

页数：8

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