E. Nardini
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View article: XRISM/Resolve Reveals the Complex Iron Structure of NGC 7213: Evidence for Radial Stratification between Inner Disk and Broad-line Region
XRISM/Resolve Reveals the Complex Iron Structure of NGC 7213: Evidence for Radial Stratification between Inner Disk and Broad-line Region Open
We present the first high-resolution X-ray spectrum of NGC 7213 obtained with XRISM/Resolve, supported by simultaneous XMM-Newton, NuSTAR, and SOAR optical data. The XRISM spectrum resolves the neutral Fe K α into two components: a narrow …
View article: The X-ray–UV luminosity relation of eROSITA quasars
The X-ray–UV luminosity relation of eROSITA quasars Open
The nonlinear relation between the UV and X-ray luminosity in quasars has been studied for decades. However, as no comprehensive model can yet explain it, its investigation still relies on observational efforts. This work focuses on optica…
View article: The Compton-thick AGN population and the <i>N</i>H distribution of low-mass AGN in our cosmic backyard
The Compton-thick AGN population and the <i>N</i>H distribution of low-mass AGN in our cosmic backyard Open
We present a census of the Compton-thick (CT) active galactic nucleus (AGN) population and the column density ($N_{\rm {H}}$) distribution of AGN in our cosmic backyard using a mid-infrared selected AGN sample within 15 Mpc. The column den…
View article: Are quasars reliable standard candles?
Are quasars reliable standard candles? Open
In this paper, we address the question of whether the non-linear relation between the X-ray and UV emission of quasars can be used to derive their distances. In previous works of our group, we demonstrated that such a relation does not sho…
View article: Are quasars reliable standard candles?
Are quasars reliable standard candles? Open
In this paper we address the question whether the non-linear relation between the X-ray and UV emission of quasars can be used to derive their distances. In previous works of our group, we demonstrated that such a relation does not show an…
View article: Explaining the UV to X-ray correlation in active galactic nuclei within the framework of X-ray illumination of accretion discs
Explaining the UV to X-ray correlation in active galactic nuclei within the framework of X-ray illumination of accretion discs Open
Context. It is established that the ultraviolet (UV) and X-ray emission in active galactic nuclei (AGN) is tightly correlated. This correlation is observed both in low- and high-redshift sources. In particular, observations of large sample…
View article: Explaining the UV to X-ray correlation in AGN within the framework of X-ray illumination of accretion discs
Explaining the UV to X-ray correlation in AGN within the framework of X-ray illumination of accretion discs Open
It is established that the ultraviolet (UV) and X-ray emissions in active galactic nuclei (AGN) are tightly correlated. This correlation is observed both in low- and high-redshift sources. In particular, observations of large samples of qu…
View article: The near-infrared spectral energy distribution of blue quasars: Determining what drives the evolution of the dusty torus
The near-infrared spectral energy distribution of blue quasars: Determining what drives the evolution of the dusty torus Open
A fundamental ingredient in the unified model of active galactic nuclei (AGN) is the obscuring torus, whose innermost, hottest region dominates the near infrared (NIR) emission. Characterising the change in the torus properties and its int…
View article: Low-Eddington ratio, changing-look active galactic nuclei: The case of NGC 4614
Low-Eddington ratio, changing-look active galactic nuclei: The case of NGC 4614 Open
Active galactic nuclei (AGNs) are known to be variable sources across the entire electromagnetic spectrum, in particular at optical/ultraviolet and X-ray energies. Over the past few decades, a growing number of AGNs have been observed to c…
View article: The near-infrared SED of blue quasars: what drives the evolution of the dusty torus?
The near-infrared SED of blue quasars: what drives the evolution of the dusty torus? Open
A fundamental ingredient in the unified model of active galactic nuclei (AGN) is the obscuring torus, whose innermost, hottest region dominates the near infrared (NIR) emission. Characterising the change in the torus properties and its int…
View article: Exploring the high-density reflection model for the soft excess in RBS 1124
Exploring the high-density reflection model for the soft excess in RBS 1124 Open
‘Bare’ active galactic nuclei (AGN) are a subclass of Type 1 AGN that show little or no intrinsic absorption. They offer an unobscured view of the central regions of the AGN and therefore serve as ideal targets to study the relativistic re…
View article: Exploring the high-density reflection model for the soft excess in RBS 1124
Exploring the high-density reflection model for the soft excess in RBS 1124 Open
'Bare' active galactic nuclei (AGN) are a subclass of Type 1 AGN that show little or no intrinsic absorption. They offer an unobscured view of the central regions of the AGN and therefore serve as ideal targets to study the relativistic re…
View article: MUSE adaptive-optics spectroscopy confirms dual active galactic nuclei and strongly lensed systems at sub-arcsec separation
MUSE adaptive-optics spectroscopy confirms dual active galactic nuclei and strongly lensed systems at sub-arcsec separation Open
The novel Gaia multi peak (GMP) technique has proven to be able to successfully select dual and lensed active galactic nuclei (AGN) candidates at sub-arcsecond separations. Both populations are important because dual AGN represent one of t…
View article: The <i>XMM-Newton</i> and <i>NuSTAR</i> view of IRASF11119+3257
The <i>XMM-Newton</i> and <i>NuSTAR</i> view of IRASF11119+3257 Open
Context. IRASF11119+3257 is an ultra-luminous infrared galaxy with a post-merger morphology, hosting a type-1 quasar at z = 0.189. It shows a prominent ultra-fast outflow (UFO) absorption feature ( v out ∼ 0.25 c ) in its 2013 Suzaku spect…
View article: The XMM-Newton and NuSTAR view of IRASF11119+3257. I Detection of multiple UFO components and a very cold corona
The XMM-Newton and NuSTAR view of IRASF11119+3257. I Detection of multiple UFO components and a very cold corona Open
IRASF11119 is an ultra-luminous IR galaxy with post-merger morphology, hosting a type-1 QSO at z=0.189. Its 2013 Suzaku spectrum shows a prominent Ultra Fast Outflow (UFO) absorption feature (v_out~0.25c). In 2021, we obtained the first XM…
View article: Quasars as standard candles
Quasars as standard candles Open
A sample of quasars has been recently assembled to investigate the non-linear relation between their monochromatic luminosities at 2500 Å and 2 keV and to exploit quasars as a new class of ‘standardized candles’. The use of this technique …
View article: AGNFITTER-RX: Modeling the radio-to-X-ray spectral energy distributions of AGNs
AGNFITTER-RX: Modeling the radio-to-X-ray spectral energy distributions of AGNs Open
We present new advancements in the modeling of the spectral energy distributions (SEDs) of active galaxies by introducing the radio-to-X-ray fitting capabilities of the publicly available Bayesian code AGN FITTER . The new code release, ca…
View article: AGNfitter-rx: Modelling the radio-to-X-ray SEDs of AGNs
AGNfitter-rx: Modelling the radio-to-X-ray SEDs of AGNs Open
We present new frontiers in the modelling of the spectral energy distributions (SED) of active galaxies by introducing the radio-to-X-ray fitting capabilities of the publicly available Bayesian code AGNfitter. The new code release, called …
View article: The high energy X-ray probe (HEX-P): the future of hard X-ray dual AGN science
The high energy X-ray probe (HEX-P): the future of hard X-ray dual AGN science Open
A fundamental goal of modern-day astrophysics is to understand the connection between supermassive black hole (SMBH) growth and galaxy evolution. Merging galaxies offer one of the most dramatic channels for galaxy evolution known, capable …
View article: The High-Energy X-ray Probe (HEX-P): the circum-nuclear environment of growing supermassive black holes
The High-Energy X-ray Probe (HEX-P): the circum-nuclear environment of growing supermassive black holes Open
Ever since the discovery of the first active galactic nuclei (AGN), substantial observational and theoretical effort has been invested into understanding how massive black holes have evolved across cosmic time. Circum-nuclear obscuration i…
View article: Quasars as standard candles
Quasars as standard candles Open
A characteristic feature of quasars is the observed non-linear relationship between their monochromatic luminosities at rest-frame 2500 Å and 2 keV. This relationship is evident across all redshifts and luminosities and, due to its non-lin…
View article: MUSE view of PDS 456: Kiloparsec-scale wind, extended ionized gas, and close environment
MUSE view of PDS 456: Kiloparsec-scale wind, extended ionized gas, and close environment Open
PDS 456 is the most luminous ( L bol ∼ 10 47 erg s −1 ) radio-quiet quasar at z < 0.3 and can be regarded as a local counterpart of the powerful quasars shining at Cosmic Noon. It hosts a strong nuclear X-ray ultra-fast (∼0.3 c ) outflow, …
View article: Quasars as standard candles VI: spectroscopic validation of the cosmological sample
Quasars as standard candles VI: spectroscopic validation of the cosmological sample Open
A sample of quasars has been recently assembled to investigate the non-linear relation between their monochromatic luminosities at 2500Å, and 2 keV and to exploit quasars as a new class of standardized candles. The use of this technique fo…
View article: Supermassive Black Hole Winds in X-rays: SUBWAYS
Supermassive Black Hole Winds in X-rays: SUBWAYS Open
The detection of blueshifted absorption lines likely associated with ionized iron K-shell transitions in the X-ray spectra of many active galactic nuclei (AGNs) suggests the presence of a highly ionized gas outflowing with mildly relativis…
View article: The high energy X-ray probe (HEX-P): constraining supermassive black hole growth with population spin measurements
The high energy X-ray probe (HEX-P): constraining supermassive black hole growth with population spin measurements Open
Constraining the primary growth channel of supermassive black holes (SMBHs) remains one the most actively debated questions in the context of cosmological structure formation. Owing to the expected connection between SMBH spin parameter ev…
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: Building the high-redshift Hubble Diagram with quasars
Building the high-redshift Hubble Diagram with quasars Open
Proceeding of the "HACK100" Conference, 6-10 June 2022, Trieste, Italy - In recent years, quasars have been shown to be reliable standardizable candles, thanks to the non-linear relation between their X-rays and ultraviolet luminosity. Qua…
View article: The high energy X-ray probe (HEX-P): probing the physics of the X-ray corona in active galactic nuclei
The high energy X-ray probe (HEX-P): probing the physics of the X-ray corona in active galactic nuclei Open
The hard X-ray emission in active galactic nuclei (AGN) and black hole X-ray binaries is thought to be produced by a hot cloud of electrons referred to as the corona. This emission, commonly described by a power law with a high-energy cuto…
View article: Quasars as Standard Candles V. Evaluation of a $\leq$ 0.06 dex intrinsic dispersion in the LX-LUV relation
Quasars as Standard Candles V. Evaluation of a $\leq$ 0.06 dex intrinsic dispersion in the LX-LUV relation Open
A characteristic feature of quasars is the observed non-linear relationship between their monochromatic luminosities at rest-frame 2500 Å and 2 keV. This relationship is evident across all redshifts and luminosities and, due to its non-lin…
View article: The High Energy X-ray Probe (HEX-P): The Future of Hard X-ray Dual AGN Science
The High Energy X-ray Probe (HEX-P): The Future of Hard X-ray Dual AGN Science Open
A fundamental goal of modern-day astrophysics is to understand the connection between supermassive black hole (SMBH) growth and galaxy evolution. Merging galaxies offer one of the most dramatic channels for galaxy evolution known, capable …