A5064144032- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Medieval European Literature and History
- Cosmology and Gravitation Theories
- Medieval Literature and History
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- Medieval Iberian Studies
- Historical Studies of British Isles
- Libraries, Manuscripts, and Books
- Calibration and Measurement Techniques
- Advanced Mathematical Theories and Applications
- Historical and Literary Studies
- Historical and Environmental Studies
- Mechanics and Biomechanics Studies
- Scientific Research and Discoveries
- Advanced X-ray Imaging Techniques
- Stellar, planetary, and galactic studies
- Remote Sensing in Agriculture
- Laser Design and Applications
- Statistics Education and Methodologies
Trieste Astronomical Observatory
2024
Arcetri Astrophysical Observatory
2021-2023
National Institute for Astrophysics
2022
Osservatorio di Astrofisica e Scienza dello Spazio
2019-2020
University of Bologna
2019
We present a new catalogue of ∼2400 optically selected quasars with spectroscopic redshifts and X-ray observations from either Chandra or XMM–Newton . The sample can be used to investigate the non-linear relation between ultraviolet (UV) luminosity as well build Hubble diagram up redshift z ∼ 7.5. sources that are neither reddened by dust in optical UV nor obscured gas X-rays, whose fluxes free flux-limit-related biases. After checking for any possible systematics, we confirm, agreement our...
We used low- to high-frequency ALMA observations investigate the cold gas and dust in ten quasistellar objects (QSOs) at z ≳ 6. Our analysis of CO(6−5) CO(7−6) emission lines selected QSOs provided insights into their molecular masses, which average around 10 M ⊙ . This is consistent with typical values for high-redshift QSOs. Proprietary archival bands 8 9 enabled precise constraints on properties star formation rate (SFR) four our sample first time. The examination redshift distribution...
A tight non-linear relation between the X-ray and optical-ultraviolet (UV) emission has been observed in Active Galactic Nuclei (AGN) over a wide range of redshift several orders magnitude luminosity, suggesting existence an ubiquitous physical mechanism regulating energy transfer accretion disc emitting corona. Recently, our group developed method to use this observational cosmology, turning quasars into standardizable candles. This work main aim investigate potential evolution correction...
(abridged) We present the X-ray analysis of a sample 30 luminous quasars at $z\simeq3.0-3.3$ with deep XMM-Newton observations, selected from SDSS-DR7 to be representative most luminous, intrinsically blue quasar population. By construction, boasts unique degree homogeneity in terms optical/UV properties. In X-rays, only four sources are too faint for detailed spectral analysis. Neglecting radio-loud object, other 25 are, as whole, ever observed, rest-frame 2-10 keV luminosities...
ABSTRACT We present a detailed analysis of the X-ray, infrared, and carbon monoxide (CO) emission for sample 35 local (z ≤ 0.15), active (LX ≥ 1042 erg s−1) galaxies. Our goal is to infer contribution far-ultraviolet (FUV) radiation from star formation (SF), X-ray galactic nuclei (AGNs), respectively, producing photodissociation regions (PDRs) X-ray-dominated (XDRs), molecular gas heating. To this aim, we exploit CO spectral line energy distribution (CO SLED) as traced by Herschel,...
Aims. We perform a homogeneous analysis of an unprecedented set spatially resolved scaling relations (SRs) between interstellar medium (ISM) components, that is to say dust, gas, and gas-phase metallicity, other galaxy properties, such as stellar mass ( M star ), total baryonic content, star-formation rate (SFR), in range physical scales 0.3 3.4 kpc. also study some ratios components: dust-to-stellar, dust-to-gas, dust-to-metal ratios. Methods. use sample 18 large, spiral, face-on DustPedia...
Line ratio diagnostics provide valuable clues on the source of ionizing radiation in galaxies with intense black hole accretion and starbursting events, such as local Seyfert or at peak star formation history. We aim to a reference joint optical mid-IR analysis for studying AGN identification via line ratios testing predictions from photoionization models. obtained homogenous spectra Southern Africa Large Telescope 42 Spitzer/IRS spectroscopy X-ray multiband data available. After confirming...
Observational campaigns hunting the elusive reservoirs of cold gas in host galaxies quasars at epoch reionization (EoR) are crucial for studying formation and evolution first massive systems early epochs. We present new Northern Extended Millimeter Array (NOEMA) observations tracing CO(6--5) CO(7--6) emission lines as well underlying continuum five eight redshift z>7 known to date, thus completing survey molecular reservoir quasars. Combining NOEMA with archival Atacama Large...
We present the multi-epoch monitoring with NuSTAR and XMM-Newton of NGC 1358, a nearby Seyfert 2 galaxy whose properties made it promising candidate X-ray changing look AGN, i.e., source column density could transition from its 2017 Compton-thick (CT-, having line-of-sight Hydrogen NH,los>10^24 cm^-2) state to Compton-thin (NH,los<10^24 one. The confirmed presence significant NH,los variability over time-scales as short weeks, allowed us confirm "changing look" nature which has most recently...
Context. We present the broad-band X-ray spectral analysis (0.6–50 keV) of seven Compton-thick active galactic nuclei (CT-AGN; line-of-sight (LOS) column density > 10 24 cm −2 ) candidates selected from Swift -BAT 100 month catalogue using archival NuSTAR data. Aims. aim to obtain a complete census heavily obscured AGN in local Universe ( z < 0.05). Methods. This work is continuation ongoing research Clemson-INAF group classify CT-AGN at redshift 0.05 physically motivated torus models....
We present a multi-wavelength study of the molecular gas properties sample local Seyfert 2 galaxies to assess if, and what extent, presence an active galactic nucleus (AGN) can affect Interstellar Medium (ISM) in 33 galaxies. compare content (MH2), derived from new archival low-J CO line measurements AGN control star-forming (SFGs). Both are characterised terms host-galaxy (e.g., stellar dust masses, Mstar Mdust, respectively; star formation rate, SFR). also investigate effect activity onto...
We present the analysis of rest frame ultraviolet and optical spectra 30 bright blue quasars at z ∼ 3, selected to examine suitability active galactic nuclei as cosmological probes. In our previous works, based on pointed XMM-Newton observations, we found an unexpectedly high fraction (≈25%) X-ray weak in sample. The latter sources also display a flatter UV continuum broader fainter C IV profile archival data with respect their normal counterparts. Here new observations Large Binocular...
We analyse the properties of CIV broad emission line in connection with X-ray 30 bright SDSS quasars at z~3.0-3.3 pointed XMM-Newton observations, which were selected to test suitability AGN as cosmological tools. In our previous work, we found that a large fraction (~25%) this sample are underluminous by factors >3-10. As absorbing columns >10$^{23}$ cm$^{-2}$ can be safely ruled out, their weakness is most likely intrinsic. Here explore possible correlations between UV and features these...
We leveraged low to high frequency ALMA observations investigate the cold gas and dust in 10 QSOs at $z\gtrsim 6$. Our analysis of CO(6-5) CO(7-6) emission lines selected provided insights into their molecular masses, averaging around $10^{10}\ \rm M_\odot$, consistent with typical values for high-redshift QSOs. Proprietary archival bands 8 9 enabled, first time, precise constraints on properties SFR 4 our sample. Examination redshift distribution temperatures revealed a general trend...
Context: The far-infrared (FIR) and sub-millimeter (submm) emissivity of the Milky Way (MW) cirrus is an important benchmark for dust grain models. Dust masses in other galaxies are generally derived from FIR/submm using emission properties these MW-calibrated Aims: We seek to derive nine nearby spiral check its compatibility with MW measurements. Methods: obtained values at 70 500 um, maps Herschel satellite gas surface density THINGS HERACLES surveys on a scale corresponding 440 pc....
We observed four nearby spiral galaxies (NGC 3627, NGC 4254, 4736 and 5055) in the K band with 64-m Sardinia Radio Telescope, aim of detecting Anomalous Microwave Emission (AME), a radiation component presumably due to spinning dust grains, so far Milky Way handful other only (most notably, M 31). mapped at 18.6 24.6 GHz studied their global photometry together radio-continuum data from literature, order find AME as emission excess synchrotron thermal components. upper limits for AME. These...
We present the analysis of rest frame ultraviolet and optical spectra 30 bright blue quasars at $z\sim3$, selected to examine suitability AGN as cosmological probes. In our previous works, we found an unexpectedly high fraction ($\approx 25 \%$) X-ray weak in sample. The latter sources also display a flatter UV continuum broader fainter CIV profile archival data with respect their normal counterparts. Here new observations LBT both $zJ$ (rest-frame $\simeq$2300-3100 $\rm \mathring{A}$) $K_S$...
We present a multi-wavelength study (from X-ray to millimetre) of the nearby low-luminosity active galactic nucleus (LLAGN) NGC 7213. combine information from different bands characterize source in terms contribution AGN and host-galaxy interstellar medium (ISM). This approach allows us provide coherent picture role its impact, if any, on star formation molecular gas properties host galaxy. focused our archival ALMA Cycle 1 observations, where CO(2-1) emission line has been used as tracer...
We investigate the star formation process within central 3.3 kpc region of nearby luminous infrared Seyfert NGC 7469, probing scales ranging from 88 to 330 pc. combine JWST/MIRI imaging with F770W filter, CO(2-1) and underlying 1.3 mm dust continuum data ALMA, along VLA radio observations at 22 GHz. 7469 hosts a starburst ring which dominates overall activity. estimate global rate SFR $\sim 11.5$ $\rm M_{\odot}~yr^{-1}$ GHz, cold molecular gas mass M(H2) $\sim$ 6.4 $\times$ 10^9 M_{\odot}$...
Abstract We investigate the star formation process within central 3.3 kpc region of nearby luminous infrared Seyfert NGC 7469, probing scales ranging from 88 to 330 pc. combine JWST/MIRI imaging with F770W filter, CO(2 – 1) and underlying 1.3 mm dust continuum data Atacama Large Millimeter/submillimeter Array, along Karl G. Jansky Very Array radio observations at 22 GHz. 7469 hosts a starburst ring which dominates overall activity. estimate global rate (SFR) ∼ 11.5 M ⊙ yr −1 GHz, cold...
One of the main open questions in field luminous ( L bol > 10 47 erg s −1 ) quasars (QSOs) at z ≳ 6 is rapid formation (< 1 Gyr) their supermassive black holes (SMBHs). For this work we analysed relation between X-ray properties and other describing physics growth both accretion disc SMBH QSOs Epoch Reionization (EoR). The sample consists 21 QSOs, which includes 16 sources from rapidly grown HYPERION five with available high-quality archival data. We discovered a strong statistically...
We aim at characterizing the X-ray-to-optical/near-infrared broad-band emission of luminous QSOs in first Gyr cosmic evolution to understand whether they exhibit differences compared lower-\textit{z} QSO population. Our goal is also provide for these objects a reliable and uniform catalog SED fitting derivable properties such as bolometric monochromatic luminosities, Eddington ratios, dust extinction, strength hot emission. characterize X-ray/UV each using average SEDs from Type 1 sources...