2018A&A...617A..82B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST15:26:31

2018A&A...617A..82B - Astronomy and Astrophysics, volume 617A, 82-82 (2018/9-1)

The WISSH quasars project. V. ALMA reveals the assembly of a giant galaxy around a z = 4.4 hyper-luminous QSO.

BISCHETTI M., PICONCELLI E., FERUGLIO C., DURAS F., BONGIORNO A., CARNIANI S., MARCONI A., PAPPALARDO C., SCHNEIDER R., TRAVASCIO A., VALIANTE R., VIETRI G., ZAPPACOSTA L. and FIORE F.

Abstract (from CDS):

We present an ALMA high-resolution (0.18''x0.21'') observation of the 840µm continuum and [CII] λ157.74µm line emission in the WISE-SDSS selected hyper-luminous (WISSH) quasi-stellar object (QSO) J1015+0020, at z∼4.4. Our analysis reveals an exceptional overdensity of [CII]-emitting companions with a very small (<150km/s) velocity shift with respect to the QSO redshift. We report the discovery of the closest companion observed so far in submillimetre observations of high-z QSOs. It is only 2.2kpc distant and merging with J1015+0020, while two other [CII] emitters are found at 8 and 17kpc. Two strong continuum emitters are also detected at <3.5-arcsec from the QSO. They are likely associated with the same overdense structure of J1015+0020, as they exceed by a factor of 100 the number of expected sources, considering the log(N)-log(S) at 850µm. The host galaxy of J1015+0020 shows a star formation rate (SFR) of about 100M/yr, while the total SFR of the QSO and its companion galaxies is a factor of ∼10 higher, indicating that substantial stellar mass assembly at early epochs may have taken place in the QSO satellites. For J1015+0020 we computed a black hole mass MBH∼6x109M. As we resolve the [CII] emission of the QSO, we can compute a dynamical mass of Mdyn∼4x1010M. This translates into an extreme ratio Mdyn/MBH∼7, i.e. two orders of magnitude smaller than what is typically observed in local galaxies. The total stellar mass of the QSO host galaxy plus the [CII] emitters in the ALMA field of view already exceeds 1011M at z∼4.4. These sources will likely merge and develop into a giant galaxy of ∼1.3x1012M. Under the assumption of constant Macc or λEdd equal to the observed values, we find that the growth timescale of the host galaxy of J1015+0020 is comparable or even shorter than that inferred for the SMBH.

Abstract Copyright: © ESO 2018

Journal keyword(s): quasars: individual: SDSS J101549.00+002020.03 - galaxies: high-redshift - galaxies: star formation - quasars: supermassive black holes - quasars: emission lines

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5331 6
2 QSO B1013+0035 QSO 10 15 49.0050307145 +00 20 20.015448963   22.25 20.79     ~ 59 0
3 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1777 3
4 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2679 4
5 NGC 6420 GiG 17 36 16.308 +68 03 08.46   15.5       ~ 13 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-15:26:31

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