SUPER VI. A giant molecular halo around a z similar to 2 quasar
Artikel i vetenskaplig tidskrift, 2021

We present the discovery of copious molecular gas in the halo of cid_346, a z=2.2 quasar studied as part of the SINFONI survey for Unveiling the Physics and Effect of Radiative feedback (SUPER). New Atacama Compact Array (ACA) CO(3-2) observations detect a much higher flux (by a factor of 14 +/- 5) than measured on kiloparsec scales (r less than or similar to 8 kpc) using previous snapshot Atacama Large Millimeter/submillimeter Array data. Such additional CO(3-2) emission traces a structure that extends out to r similar to 200 kpc in projected size, as inferred through direct imaging and confirmed by an analysis of the uv visibilities. This is the most extended molecular circumgalactic medium (CGM) reservoir that has ever been mapped. It shows complex kinematics, with an overall broad line profile (FWHM=1000 km s(-1)) that is skewed towards redshifted velocities up to at least v similar to 1000 km s(-1). Using the optically thin assumption, we estimate a strict lower limit for the total molecular CGM mass observed by ACA of M-mol(CGM) > 10(10) M-circle dot. There is however room for up to M-mol(CGM) similar to 1.7 x 10(12) M-circle dot, once optically thick CO emission with alpha(CO) = 3.6 M-circle dot (K km s(-1) pc(2))(-1) and LCO(3- 2)'/LCO(1-0)' = 0.5 are assumed. Since cid_346 hosts quasar-driven ionised outflows and since there is no evidence of merging companions or an overdensity, we suggest that outflows may have played a crucial rule in seeding metal-enriched, dense gas on halo scales. However, the origin of such an extended molecular CGM remains unclear.

galaxies: halos

galaxies: high-redshift

intergalactic medium

galaxies: active

submillimeter: galaxies

quasars: individual: cid_346


C. Cicone

Universitetet i Oslo

V Mainieri

European Southern Observatory Santiago

C. Circosta

University College London (UCL)

D. Kakkad

European Southern Observatory Santiago

University of Oxford

G. Vietri

Istituto nazionale di astrofisica (INAF)

M. Perna

Centro de Astrobiología (INTA-CSIC)

M. Bischetti

Istituto nazionale di astrofisica (INAF)

S. Carniani

Scuola Normale Superiore di Pisa

G. Cresci

Istituto nazionale di astrofisica (INAF)

C. Harrison

Newcastle University

F. Mannucci

Istituto nazionale di astrofisica (INAF)

A. Marconi

Istituto nazionale di astrofisica (INAF)

Universita degli Studi di Firenze

E. Piconcelli

Istituto nazionale di astrofisica (INAF)

A. Puglisi

Durham University

Jan Scholtz

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

C. Vignali

Istituto nazionale di astrofisica (INAF)

Universita di Bologna

G. Zamorani

Istituto nazionale di astrofisica (INAF)

L. Zappacosta

Istituto nazionale di astrofisica (INAF)

F. Arrigoni Battaia


Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 654 L8


Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik




Mer information

Senast uppdaterat