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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31887
Title: SUPER. VI. A giant molecular halo around a z~2 quasar
Authors: Cicone, C.
Mainieri, V.
Circosta, C.
Kakkad, D.
Vietri, G.
Perna, M.
BISCHETTI, MANUELA 
Carniani, S.
CRESCI, GIOVANNI 
Harrison, C.
MANNUCCI, FILIPPO 
Marconi, Alessandro 
PICONCELLI, Enrico 
Puglisi, A.
Scholtz, J.
Vignali, C.
Zamorani, G.
ZAPPACOSTA, Luca 
Arrigoni Battaia, F.
Issue Date: 2021
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 654
First Page: L8
Abstract: 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 $14\pm5$) than measured on kiloparsec scales ($r\lesssim8$ kpc) using previous snapshot Atacama Large Millimeter/submillimeter Array data. Such additional CO(3-2) emission traces a structure that extends out to $r\sim200$ 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) that is skewed towards redshifted velocities up to at least $v\sim1000$ km/s. Using the optically thin assumption, we estimate a strict lower limit for the total molecular CGM mass observed by ACA of $M_{mol}^{CGM}>10^{10}~M_{\odot}$. There is however room for up to $M^{CGM}_{mol}\sim 1.7\times 10^{12}$ $M_{\odot}$, once optically thick CO emission with $\alpha_{\rm CO}=3.6$ $\rm M_{\odot}~(K~km~s^{-1}~pc^2)^{-1}$ and $L^{\prime}_{CO(3-2)}/L^{\prime}_{CO(1-0)}=0.5$ 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.
URI: http://hdl.handle.net/20.500.12386/31887
URL: https://www.aanda.org/articles/aa/full_html/2021/10/aa41611-21/aa41611-21.html
http://arxiv.org/abs/2109.02269v2
ISSN: 0004-6361
DOI: 10.1051/0004-6361/202141611
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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