Publications (23)
The Ionised- and Cool-Gas Content of The BR1202-0725 System as seen by MUSE and ALMA
A. B. Drake, F. Walter, M. Novak +7
We present MUSE observations of the gas-rich major-merger BR1202-0725 at z~4.7, which constitutes one of the most overdense fields known in the early Universe. We utilise these dat…
Revised optical classification of a sample of gamma-ray emitting AGN with GTC and VLT
B. Dalla Barba, L. Foschini, M. Berton +10
We report the results of the optical follow-up of a sample of -ray-emitting active galactic nuclei (AGN). New high-quality optical spectra were obtained using Gran Telescopio C…
The Pan-STARRS1 distant z>5.6 quasar survey: more than 100 quasars within the first Gyr of the universe
E. Bañados, B. P. Venemans, R. Decarli +33
Luminous quasars at z>5.6 can be studied in detail with the current generation of telescopes and provide us with unique information on the first gigayear of the universe. Thus far…
The identification of z-dropouts in Pan-STARRS1: three quasars at 6.5<z<6.7
B. P. Venemans, E. Bañados, R. Decarli +30
Luminous distant quasars are unique probes of the high redshift intergalactic medium (IGM) and of the growth of massive galaxies and black holes in the early universe. Absorption d…
Powerful Radio Sources in the Southern Sky. II. A SWIFT X-Ray Perspective
F. Massaro, S. V. White, A. Paggi +18
We recently constructed the G4Jy-3CRE, a catalog of extragalactic radio sources based on the GLEAM 4-Jy (G4Jy) sample, with the aim of increasing the number of powerful radio galax…
The cavity of 3CR 196.1: H emission spatially associated with an X-ray cavity
A. Jimenez-Gallardo, E. Sani, F. Ricci +20
We present a multifrequency analysis of the radio galaxy 3CR 196.1 (), associated with the brightest galaxy of the cool core cluster CIZAJ0815.4-0303. This nearby radio…
An 800-million-solar-mass black hole in a significantly neutral Universe at redshift 7.5
E. Bañados, B. P. Venemans, C. Mazzucchelli +15
Quasars are the most luminous non-transient objects known and as a result they enable studies of the Universe at the earliest cosmic epochs. Despite extensive efforts, however, the…
Raining in MKW 3s: a Chandra-MUSE analysis of X-ray cold filaments around 3CR 318.1
A. Jimenez-Gallardo, F. Massaro, B. Balmaverde +23
We present the analysis of X-ray and optical observations of gas filaments observed in the radio source 3CR 318.1, associated with NGC 5920, the Brightest Cluster Galaxy (BCG) of M…
Chandra X-rays from the redshift 7.54 quasar ULAS J1342+0928
E. Bañados, T. Connor, D. Stern +9
We present a 45 ks Chandra observation of the quasar ULAS J1342+0928 at z=7.54. We detect 14.0^{+4.8}_{-3.7} counts from the quasar in the observed-frame energy range 0.5-7.0 keV (…
Powerful Radio Sources in the Southern Sky. I. Optical Identifications
F. Massaro, S. V. White, A. Garcia-Perez +18
Since the early sixties, our view of radio galaxies and quasars has been drastically shaped by discoveries made thanks to observations of radio sources listed in the Third Cambridg…
Spectral Energy Distributions of Companion Galaxies to z6 Quasars
C. Mazzucchelli, R. Decarli, E. P. Farina +10
Massive, quiescent galaxies are already observed at redshift , i.e. 1.5 Gyr after the Big Bang. Current models predict them to be formed via massive, gas-rich mergers…
A lack of LAEs within 5Mpc of a luminous quasar in an overdensity at z=6.9: potential evidence of quasar negative feedback at protocluster scales
Trystan S. Lambert, R. J. Assef, C. Mazzucchelli +13
High-redshift quasars are thought to live in the densest regions of space which should be made evident by an overdensity of galaxies around them. However, campaigns to identify the…
VAR-PZ: Constraining the Photometric Redshifts of Quasars using Variability
S. Satheesh-Sheeba, R. J. Assef, T. Anguita +33
The Vera C. Rubin Observatory LSST is expected to discover tens of millions of new Active Galactic Nuclei (AGNs). The survey's exceptional cadence and sensitivity will enable UV/op…
The host galaxies of radio-loud quasars at z>5 with ALMA
C. Mazzucchelli, R. Decarli, S. Belladitta +13
The interaction between radio-jets and quasar host galaxies plays a paramount role in quasar/galaxy co-evolution. However, very little has been known so far about this interaction…
XQR-30: Black Hole Masses and Accretion Rates of 42 z>6 Quasars
C. Mazzucchelli, M. Bischetti, V. D'Odorico +19
We present bolometric luminosities, black hole masses and Eddington ratios for 42 luminous quasars at z>6 using high signal-to-noise ratio VLT/X-Shooter spectra, acquired in the en…
No overdensity of Lyman Alpha Emitting Galaxies around a quasar at z~5.7
C. Mazzucchelli, E. Bañados, R. Decarli +4
Bright quasars, observed when the Universe was less than one billion years old (z>5.5), are known to host massive black holes (~10 M), and are thought to reside in…
How similar are narrow-line Seyfert 1 galaxies and high-z type 1 AGN?
M. Berton, E. Järvelä, A. Tortosa +1
The recent observations of highly accreting supermassive black holes (SMBH) at very high redshift (4) with the James Webb Space Telescope (JWST) allowed us to shed light for the…
VAR-PZnn: A machine-learning framework for AGN photometric redshifts using color and variability-based features
S. Satheesh-Sheeba, P. Sánchez-Sáez, R. J. Assef +39
Photometric redshift estimation for active galactic nuclei (AGNs) remains a fundamental challenge for current and upcoming large-scale photometric surveys. Traditional spectral ene…
XQR-30: the ultimate XSHOOTER quasar sample at the reionization epoch
Valentina D'Odorico, E. Banados, G. D. Becker +46
The final phase of the reionization process can be probed by rest-frame UV absorption spectra of quasars at z>6, shedding light on the properties of the diffuse intergalactic mediu…
Widespread, strong outflows in XQR-30 quasars at the Reionisation epoch
M. Bischetti, C. Feruglio, V. D'Odorico +23
Luminous quasars powered by accretion onto billion solar mass black holes already exist at the epoch of Reionisation, when the Universe was 0.5-1 Gyr old. These objects likely resi…
Physical properties of 15 quasars at
C. Mazzucchelli, E. Bañados, B. P. Venemans +21
Quasars are galaxies hosting accreting supermassive black holes; due to their brightness, they are unique probes of the early universe. To date, only few quasars have been reported…
4MOST ChANGES: Catalog of high-redshift quasar candidates (4.5 < < 7) selected with SED fitting
T. Mkrtchyan, C. Mazzucchelli, R. J. Assef +12
The identification of high-redshift quasars () is critical for studying the early Universe, supermassive black hole growth, and cosmic reionization. Most known high-redshi…
An ALMA multi-line survey of the ISM in two quasar host-companion galaxy pairs at
A. Pensabene, R. Decarli, E. Bañados +15
We present a multi-line survey of the interstellar medium (ISM) in two quasar (QSO) host galaxies, PJ231-20 () and PJ308-21 (), and their two companion galaxi…