A. Moretti
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View article: X-Ray Investigation of Possible Super-Eddington Accretion in a Radio-loud Quasar at <i>z</i> = 6.13
X-Ray Investigation of Possible Super-Eddington Accretion in a Radio-loud Quasar at <i>z</i> = 6.13 Open
We present radio and X-ray observations of the recently discovered z = 6.13 radio-powerful quasar RACS J032021.44−352104.1 using the upgraded Giant Metrewave Radio Telescope, the Australia Telescope Compact Array, the Australian Large Base…
View article: Flat Spectrum Radio Quasars as high-energy neutrino sources
Flat Spectrum Radio Quasars as high-energy neutrino sources Open
The astrophysical sources responsible for the production of high-energy neutrinos remain largely uncertain. The strongest associations suggest a correlation between neutrinos and active galactic nuclei. However, it is still unclear which s…
View article: High-<i>z</i> radio quasars in RACS
High-<i>z</i> radio quasars in RACS Open
Radio-bright jetted quasars at z > 5 serve as unique laboratories for studying supermassive black hole activity in the early Universe. In this work, we present a sample of high- z jetted quasars selected from a combination of the radio Rap…
View article: The uncommon intracluster medium features of the first massive clusters selected independently of their baryon content
The uncommon intracluster medium features of the first massive clusters selected independently of their baryon content Open
Our current knowledge of the thermodynamic properties of galaxy clusters comes primarily from detailed studies of clusters selected by their minority components: hot baryons. Most of these studies select the clusters using the component th…
View article: The high energy X-ray probe (HEX-P): science overview
The high energy X-ray probe (HEX-P): science overview Open
To answer NASA’s call for a sensitive X-ray observatory in the 2030s, we present the High Energy X-ray Probe (HEX-P) mission concept. HEX-P is designed to provide the required capabilities to explore current scientific questions and make n…
View article: Multi-wavelength properties of three new radio-powerful <i>z</i> ∼ 5.6 quasi-stellar objects discovered from RACS
Multi-wavelength properties of three new radio-powerful <i>z</i> ∼ 5.6 quasi-stellar objects discovered from RACS Open
We present a multi-wavelength study of three new z ∼ 5.6 quasi-stellar objects (QSOs) identified from dedicated spectroscopic observations. The three sources were selected as high- z candidates based on their radio and optical/near-infrare…
View article: The high energy X-ray probe (HEX-P): the most powerful jets through the lens of a superb X-ray eye
The high energy X-ray probe (HEX-P): the most powerful jets through the lens of a superb X-ray eye Open
A fraction of the active supermassive black holes at the centers of galaxies in our Universe are capable of launching extreme kiloparsec-long relativistic jets. These jets are known multiband (radio to -ray) and multimessenger (neutrino) …
View article: Multi-wavelength properties of three new radio-powerful $z\sim5.6$ quasi-stellar objects discovered from RACS
Multi-wavelength properties of three new radio-powerful $z\sim5.6$ quasi-stellar objects discovered from RACS Open
We present a multi-wavelength study of three new $z\sim5.6$ quasi-stellar objects (QSOs) identified from dedicated spectroscopic observations. The three sources were selected as high-$z$ candidates based on their radio and optical/near-inf…
View article: Comprehensive view of a<i>z</i> ∼ 6.5 radio-loud quasi-stellar object: From the radio to the optical/NIR to the X-ray band
Comprehensive view of a<i>z</i> ∼ 6.5 radio-loud quasi-stellar object: From the radio to the optical/NIR to the X-ray band Open
We present a multi-wavelength analysis, from the radio to the X-ray band, of the redshift z = 6.44 VIK J2318−31 radio-loud quasi-stellar object, one of the most distant currently known of this class. The work is based on newly obtained obs…
View article: Comprehensive view on a $z\sim6.5$ radio-loud QSO: from the radio to the optical/NIR to the X-ray band
Comprehensive view on a $z\sim6.5$ radio-loud QSO: from the radio to the optical/NIR to the X-ray band Open
We present a multi-wavelength analysis, from the radio to the X-ray band, of the redshift $z=6.44$ VIK J2318$-$31 radio-loud (RL) quasi stellar object (QSO), one of the most distant currently known in this class. The work is based on newly…
View article: Observed abundance of X-ray low surface brightness clusters in optical, X-ray, and SZ selected samples
Observed abundance of X-ray low surface brightness clusters in optical, X-ray, and SZ selected samples Open
The comparison of the properties of galaxy cluster samples selected using observations in different wavebands may shed light on potential biases of the way in which the samples are assembled. For this comparison, we introduce a new observa…
View article: Observed abundance of X-ray low surface brightness clusters in optical, X-ray, and SZ selected samples
Observed abundance of X-ray low surface brightness clusters in optical, X-ray, and SZ selected samples Open
The comparison of the properties of galaxy cluster samples selected using observations in different wavebands may shed light on potential biases of the way in which the samples are assembled. For this comparison, we introduce a new observa…
View article: The high energy X-ray probe (HEX-P): bringing the cosmic X-ray background into focus
The high energy X-ray probe (HEX-P): bringing the cosmic X-ray background into focus Open
Since the discovery of the cosmic X-ray background (CXB), astronomers have strived to understand the accreting supermassive black holes (SMBHs) contributing to its peak in the 10–40 keV band. Existing soft X-ray telescopes could study this…
View article: The high energy X-ray probe (HEX-P): instrument and mission profile
The high energy X-ray probe (HEX-P): instrument and mission profile Open
The High Energy X-ray Probe (HEX-P) is a proposed NASA probe-class mission that combines the power of high angular resolution with a broad X-ray bandpass to provide the necessary leap in capabilities to address the important astrophysical …
View article: Obscuration in high-redshift jetted quasi-stellar objects
Obscuration in high-redshift jetted quasi-stellar objects Open
Context. Obscuration in high-redshift quasi-stellar objects (QSOs) has a profound impact on our understanding of the evolution of supermassive black holes across cosmic time. An accurate quantification of its relevance is therefore mandato…
View article: Obscuration in high redshift jetted QSO
Obscuration in high redshift jetted QSO Open
Obscuration in high-redshift quasi-stellar objects (QSO) has a profound impact on our understanding of the evolution of supermassive black holes across the cosmic time. An accurate quantification of its relevance is therefore mandatory. We…
View article: The High Energy X-ray Probe (HEX-P): Instrument and Mission Profile
The High Energy X-ray Probe (HEX-P): Instrument and Mission Profile Open
The High Energy X-ray Probe is a proposed NASA probe-class mission that combines the power of high angular resolution with a broad X-ray bandpass to provide the necessary leap in capabilities to address the important astrophysical question…
View article: The High Energy X-ray Probe (HEX-P): the most powerful jets through the lens of a superb X-ray eye
The High Energy X-ray Probe (HEX-P): the most powerful jets through the lens of a superb X-ray eye Open
A fraction of the active supermassive black holes at the centers of galaxies in our Universe are capable of launching extreme kiloparsec-long relativistic jets. These jets are known multiband (radio to $γ$-ray) and multimessenger (neutrino…
View article: The High Energy X-ray Probe (HEX-P): Bringing the Cosmic X-ray Background into Focus
The High Energy X-ray Probe (HEX-P): Bringing the Cosmic X-ray Background into Focus Open
Since the discovery of the cosmic X-ray background (CXB), astronomers have strived to understand the accreting supermassive black holes (SMBHs) contributing to its peak in the 10-40 keV band. Existing soft X-ray telescopes could study this…
View article: Characterising x-ray optics at PANTER for the NewATHENA mission and x-ray optic test facilities
Characterising x-ray optics at PANTER for the NewATHENA mission and x-ray optic test facilities Open
At the PANTER x-ray test facility of the Max-Planck-Institute for extraterrestrial Physics, x-ray optics for future missions are developed, tested, and calibrated. For the ESA mission NewATHENA many campaigns to test individual Silicon Por…
View article: NewATHENA optics technology
NewATHENA optics technology Open
The re-formulation phase of the next generation x-ray observatory ATHENA (Advanced Telescope for High ENergy Astrophysics) - now NewATHENA - is being utilized for further improvements of the optics technology. The Silicon Pore Optics (SPO)…
View article: The VERT-X calibration facility: development of the most critical parts
The VERT-X calibration facility: development of the most critical parts Open
The mirror assembly of the ESA New - Advanced Telescope for High-ENergy Astrophysics (New-ATHENA) will be the largest X-ray optics ever built. Indeed, its unprecedented size, mass and focal length create great difficulties for the ground c…
View article: Mirror design for the high-energy x-ray probe (HEX-P)
Mirror design for the high-energy x-ray probe (HEX-P) Open
The High Energy X-ray Probe (HEX-P) is a probe-class mission concept that combines high spatial resolution x-ray imaging and broad spectral coverage to enable revolutionary new insights into the important astrophysical questions of the nex…
View article: New Radio-Loud QSOs at the end of the Re-ionisation Epoch
New Radio-Loud QSOs at the end of the Re-ionisation Epoch Open
We present the selection of high-redshift ($z\gtrsim5.7$) radio-loud (RL) quasi-stellar object (QSO) candidates from the combination of the radio Rapid ASKAP Continuum Survey (RACS; at 888 MHz) and the optical/near-infrared Dark Energy Sur…
View article: The flat entropy profile at the outskirts of the Abell 2244 galaxy cluster
The flat entropy profile at the outskirts of the Abell 2244 galaxy cluster Open
Entropy is an advantageous diagnostics to study the thermodynamic history of the intracluster plasma of galaxy clusters. We present the entropy profile of the Abell 2244 galaxy cluster derived both exclusively using X-ray data from the low…
View article: A powerful (and likely young) radio-loud quasar at <i>z</i> = 5.3
A powerful (and likely young) radio-loud quasar at <i>z</i> = 5.3 Open
We present the discovery of PSO J191.05696+86.43172 (hereafter PSO J191+86), a new powerful radio-loud quasar (QSO) in the early Universe ( z = 5.32). We discovered it by cross-matching the NRAO VLA Sky Survey (NVSS) radio catalog at 1.4 G…
View article: The flat entropy profile at the outskirts of the Abell 2244 galaxy cluster
The flat entropy profile at the outskirts of the Abell 2244 galaxy cluster Open
Entropy is an advantageous diagnostics to study the thermodynamic history of the intracluster plasma of galaxy clusters. We present the entropy profile of the Abell 2244 galaxy cluster derived both exclusively using X-ray data from the low…
View article: A powerful (and likely young) radio-loud quasar at z=5.3
A powerful (and likely young) radio-loud quasar at z=5.3 Open
We present the discovery of PSO J191.05696$+$86.43172 (hereafter PSO J191$+$86), a new powerful radio-loud quasar (QSO) in the early Universe (z = 5.32). We discovered it by cross-matching the NRAO VLA Sky Survey (NVSS) radio catalog at 1.…
View article: ATHENA optics technology development
ATHENA optics technology development Open
Athena optics technology development Marcos Bavdaz On behalf of the Athena Optics Team Athena Scientific Conference, 10 Nov 2022