2018A&A...612A..29B


Query : 2018A&A...612A..29B

2018A&A...612A..29B - Astronomy and Astrophysics, volume 612A, 29-29 (2018/4-1)

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. and BONAGLIA M.

Abstract (from CDS):

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 10kpc. 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 1.3mm continuum at ∼30 and ∼20σ significance, respectively; both emissions are confined in the central (<2kpc) radius area. Our analysis suggests the presence of a fast rotating molecular disc (v∼400km/s) on very compact scales well inside the galaxy extent seen in the rest-frame optical light (∼10kpc, 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 ∼1010M, 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 40-75Myr, 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 ∼500-800M/yr including the molecular and atomic components in both the ionised and neutral phases, was attempted for a high-z QSO.

Abstract Copyright: © ESO 2018

Journal keyword(s): quasars: individual: XID2028 - galaxies: star formation - galaxies: active - galaxies: ISM

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4597 2
2 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2085 1
3 ACS-GC 90045460 AGN 03 32 31.462 -27 46 23.07 25.05 23.96 23.64 23.28 23.001 ~ 110 0
4 ICRF J094857.3+002225 Sy1 09 48 57.32005819 +00 22 25.5596984   18.85 18.61 18.17   ~ 318 2
5 [VV2006] J100038.0+020822 QSO 10 00 38.0145823704 +02 08 22.399120716   20.698 20.617   20.45 ~ 63 0
6 ACS-GC 20000627 AGN 10 02 11.27 +01 37 06.6 24.48 24.146 24.188   22.613 ~ 71 0
7 ICRF J105829.6+013358 Sy1 10 58 29.60520810 +01 33 58.8237454   18.74 18.28 16.68   ~ 773 2
8 SDSS J114816.64+525150.3 QSO 11 48 16.647 +52 51 50.31   25.73 25.04     ~ 452 0
9 NAME SMM J123711+622212 AGN 12 37 11.92 +62 22 12.1   27.1786 25.185   24.4196 ~ 205 0
10 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1986 3
11 SDSS J135646.10+102609.0 Sy2 13 56 46.106 +10 26 09.09   18.90 18.11     ~ 78 0
12 ULAS J153910.16+055749.7 QSO 15 39 10.16040 +05 57 49.7160           ~ 12 0

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