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

Abstract

We present an ALMA high-resolution observation of the 840 um continuum and [CII] line emission in the WISE-SDSS selected hyper-luminous (WISSH) QSO J1015+0020 at z~4.4. Our analysis reveals an exceptional overdensity of [CII]-emitting companions with a very small (<150 km/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 2.2 kpc distant and merging with J1015+0020, while two other [CII] emitters are found at 8 and 17 kpc. Two strong continuum emitters are also detected at <3.5 arcsec. They are likely associated to 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 850 um. The host galaxy of J1015+0020 shows a SFR of about 100 Msun/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 compute a SMBH mass MBH~6E9 Msun and a dynamical mass Mdyn~4E10 Msun . This translates into an extreme ratio Mdyn/MBH~7. The total stellar mass of the QSO host galaxy plus the [CII] emitters already exceeds 1E11 Msun at z~4.4. These sources will likely merge and develop into a giant galaxy of 1.3E12 Msun. Under the assumption of constant mass or Eddington accretion rate equal to the observed values, we find that the growth timescale of the host galaxy is comparable or even shorter than that inferred for the SMBH.

Accepted

References in corpus (33)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• UV Luminosity Functions at redshifts z~4 to z~10: 10000 Galaxies from HST Legacy Fields
• The WFCAM Science Archive
• The Pan-STARRS1 distant z>5.6 quasar survey: more than 100 quasars within the first Gyr of the universe
• An ALMA [CII] survey of 27 quasars at z>5.94
• Strongly baryon-dominated disk galaxies at the peak of galaxy formation ten billion years ago
• Black Holes on FIRE: Stellar Feedback Limits Early Feeding of Galactic Nuclei
• Gemini Near-infrared Spectroscopy of Luminous z~6 Quasars: Chemical Abundances, Black Hole Masses, and MgII Absorption
• Unveiling obscured accretion in the Chandra Deep Field South
• Rapidly star-forming galaxies adjacent to quasars at redshifts exceeding 6
• Very extended cold gas, star formation and outflows in the halo of a bright QSO at z>6
• The WISSH Quasars Project I. Powerful ionised outflows in hyper-luminous quasars
• The Blast Wave Model for AGN Feedback: Effects on AGN Obscuration
• Correcting CIV-Based Virial Black Hole Masses
• The SCUBA-2 Cosmology Legacy Survey: ALMA resolves the bright-end of the sub-millimeter number counts
• The identification of z-dropouts in Pan-STARRS1: three quasars at 6.5<z<6.7
• ALMA spectroscopic survey in the Hubble Ultra Deep Field: Continuum number counts, resolved 1.2-mm extragalactic background, and properties of the faintest dusty star forming galaxies
• Star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6
• ALMA Observations Show Major Mergers Among the Host Galaxies of Fast-growing, High-redshift Supermassive Black Holes
• Extremely Red Quasars in BOSS
• The compact, ~1 kpc host galaxy of a quasar at z=7.1
• ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Search for [CII] line and dust emission in 6<z<8 galaxies
• A wide dispersion in star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6
• Molecular gas in three z~7 quasar host galaxies
• High-redshift quasars host galaxies: is there a stellar mass crisis?
• Triggering Active Galactic Nuclei in Hierarchical Galaxy Formation: Disk instability vs. Interactions
• The WISSH quasars Project: II. Giant star nurseries in hyper-luminous quasars
• Growing black holes and galaxies: black hole accretion versus star formation rate
• Star Formation Rates from [CII] 158 um and Mid Infrared Emission Lines for Starbursts and AGN
• The Discovery of Gas-Rich, Dusty Starbursts in Luminous Reddened Quasars at $z\sim 2.5$ with ALMA
• Black Hole Mass and Bulge Luminosity for Low-mass Black Holes
• What does Civλ1549 tell us about the physical driver of the Eigenvector Quasar Sequence?

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