A5065073984- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Black Holes and Theoretical Physics
- Adaptive optics and wavefront sensing
- Relativity and Gravitational Theory
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- History and Developments in Astronomy
- Dark Matter and Cosmic Phenomena
- Statistics Education and Methodologies
- Geophysics and Gravity Measurements
- Advanced X-ray Imaging Techniques
- Scientific Measurement and Uncertainty Evaluation
- Nuclear Physics and Applications
- Advanced Image Processing Techniques
- Innovation Policy and R&D
Osservatorio di Astrofisica e Scienza dello Spazio
2022-2024
National Institute for Astrophysics
2022-2024
Scuola Normale Superiore
2020-2023
Osservatorio astronomico di Bologna
2012-2023
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
2022-2023
European Organization for Nuclear Research
2022
University of Bologna
2012-2022
Pontificia Universidad Católica de Chile
2019-2021
National Astronomical Observatories
2019-2020
Chinese Academy of Sciences
2019-2020
We present X-ray source catalogs for the $\approx7$ Ms exposure of Chandra Deep Field-South (CDF-S), which covers a total area 484.2 arcmin$^2$. Utilizing WAVDETECT initial detection and ACIS Extract photometric extraction significance assessment, we create main catalog containing 1008 sources that are detected in up to three bands: 0.5-7.0 keV, 0.5-2.0 2-7 keV. A supplementary is also provided including 47 lower-significance have bright ($K_s\le23$) near-infrared counterparts. identify...
We investigate the population of high-redshift ($3\leq z < 6$) AGN selected in two deepest X-ray surveys, 7 Ms \textit{Chandra} Deep Field-South and 2 Field-North. Their outstanding sensitivity spectral characterization faint sources allow us to focus on sub-$L_*$ regime (log$L_{\mathrm{X}}\lesssim44$), poorly sampled by previous works using shallower data, obscured population. Taking fully into account individual photometric-redshift probability distribution functions, final sample consists...
Star-forming galaxies are considered to be the leading candidate sources that dominate cosmic reionization at z>7, and search for analogs moderate redshift showing Lyman continuum (LyC) leakage is currently a active line of research. We have observed star-forming galaxy z=3.2 with Hubble/WFC3 in F336W filter, corresponding 730-890A rest-frame, detect LyC emission. This very compact also has large Oxygen ratio [OIII]5007/[OII]3727 (>=10). No nuclear activity revealed from...
We imaged with ALMA and ARGOS/LUCI the molecular gas dust stellar continuum in XID2028, an obscured QSO at z=1.593, where presence of a massive outflow ionized component traced by [O III]5007 emission has been resolved up to 10 kpc. This target represents unique test case study 'feedback action' peak epoch AGN-galaxy coevolution. The detected CO(5-4) transition 1.3mm continuum, ~30 ~20 {\sigma} significance respectively, both emissions confined central (<4 kpc) radius area. Our analysis...
X-ray emission from QSOs has been used to assess SMBH accretion properties up $z$~6. However, at $z>6$ only ~15 are covered by sensitive observations, preventing a statistically significant investigation of the in first Gyr Universe. We present new Chandra observations 10 QSOs, selected have virial black-hole mass estimates Mg II line spectroscopy. Adding archival data for an additional 15 we investigate QSO population Universe, focusing particular on $L_{UV}-L_{X}$ relation, which is traced...
We combine results from deep ALMA observations of massive ( M * > 10 ⊙ ) galaxies at different redshifts to show that the column density their interstellar medium (ISM) rapidly increases toward early cosmic epochs. Our analysis includes objects ASPECS and ALPINE large programs, as well individual z ∼ 6 quasar hosts. When accounting for non-detections correcting selection effects, we find median surface ISM galaxy population evolves ∼(1 + 3.3 . This means nucleus a 3 is typically 100 times...
Previous studies suggest that the growth of supermassive black holes (SMBHs) may be fundamentally related to host-galaxy stellar mass (M⋆). To investigate this SMBH growth–M⋆ relation in detail, we calculate long-term accretion rate as a function M⋆ and redshift [|$\overline{\rm BHAR}(M_{\star }, z)$|] over ranges log (M⋆/M⊙) = 9.5–12 z 0.4–4. Our |$\overline{\rm z)$| is constrained by high-quality survey data (GOODS-South, GOODS-North COSMOS), X-ray luminosity function. At given M⋆, BHAR}$|...
We present the hard-band ($2-10\,\mathrm{keV}$) X-ray luminosity function (HXLF) of $0.5-2\,\mathrm{keV}$ band selected AGN at high redshift. have assembled a sample 141 $3<z\lesssim5$ from surveys different size and depth, in order to regions $ L_X - z$ plane. The HXLF is fitted range $\mathrm{logL_X\sim43-45}$ with standard analytical evolutionary models through maximum likelihood procedure. evolution well described by pure density evolution, space declining factor $\sim10$ $z=3$ 5. A...
The coeval AGN and galaxy evolution the observed local relations between SMBHs properties suggest some connection or feedback SMBH growth build-up. We looked for correlations of X-ray detected their FIR host galaxies, to find quantitative evidences this connection, highly debated in latest years. exploit rich multi-wavelength data set available COSMOS field a large sample (692 sources) hosts, redshift range $0.1<z<4$. use select determine (intrinsic luminosity nuclear obscuration),...
We present an X-ray point-source catalogue from the XMM-Large Scale Structure (XMM-LSS) survey region, one of XMM-Spitzer Extragalactic Representative Volume Survey (XMM-SERVS) fields. target XMM-LSS region with 1.3 Ms new XMM–Newton AO-15 observations, transforming archival coverage in this into a 5.3 deg2 contiguous field uniform totaling 2.7 flare-filtered exposure, 46 ks median PN exposure time. provide 5242 sources detected soft (0.5–2 keV), hard (2–10 and/or full (0.5–10 keV) bands 1...
We perform long-term ($\approx 15$ yr, observed-frame) X-ray variability analyses of the 68 brightest radio-quiet active galactic nuclei (AGNs) in 6 Ms $Chandra$ Deep Field-South (CDF-S) survey; majority are redshift range $0.6-3.1$, providing access to penetrating rest-frame X-rays up $\approx 10-30$ keV. Twenty-four sources optical spectral type I AGNs, and rest (44) II AGNs. The time scales probed this work among longest for studies distant Photometric reveal widespread photon-flux...
We report ALMA Cycle 0 observations at 1.3mm of LESS J033229.4-275619 (XID403), an Ultraluminous Infrared Galaxy $z=4.75$ in the Chandra Deep Field South hosting a Compton-thick QSO. The source is not resolved our data resolution $\sim$0.75 arcsec, placing upper-limit 2.5 kpc to half-light radius continuum emission from heated-dust. After deconvolving for beam size, however, we found $\sim3\sigma$ indication intrinsic size $0.27\pm0.08$ arcsec (Gaussian FWHM), which would correspond...
We exploit the 7 Ms \textit{Chandra} observations in \chandra\,Deep Field-South (\mbox{CDF-S}), deepest X-ray survey to date, coupled with CANDELS/GOODS-S data, measure total emission arising from 2076 galaxies at $3.5\leq z < 6.5$. This aim is achieved by stacking data positions of optically selected galaxies, reaching effective exposure times $\geq10^9\mathrm{s}$. detect significant ($>3.7σ$) massive $z\approx4$. also report detection $z\approx5$ a $99.7\%$ confidence level ($2.7σ$),...
ABSTRACT Observations in the local universe show a tight correlation between masses of supermassive black holes (SMBHs; MBH) and host-galaxy bulges (Mbulge), suggesting strong connection SMBH bulge growth. However, direct evidence for such distant remains elusive. We have studied sample-averaged accretion rate ($\overline{\rm BHAR}$) bulge-dominated galaxies at z = 0.5–3. While previous observations found $\overline{\rm BHAR}$ is strongly related to stellar mass (M⋆) overall galaxy...
Abstract W-CDF-S, ELAIS-S1, and XMM-LSS will be three Deep-Drilling Fields (DDFs) of the Vera C. Rubin Observatory Legacy Survey Space Time (LSST), but their extensive multiwavelength data have not been fully utilized as done in COSMOS field, another LSST DDF. To prepare for future science, we fit source spectral energy distributions (SEDs) from X-ray to far-infrared these fields mainly derive galaxy stellar masses star formation rates. We use CIGALE v2022.0, a code that has regularly...
The existence of luminous quasars (QSOs) at the epoch reionization (EoR; i.e., z > 6) powered by well-grown supermassive black holes (SMBHs) with masses ≳10 9 M ⊙ challenges models early SMBH formation and growth. To shed light on nature these sources, we started a multiwavelength program based sample 18 HYPerluminous Epoch ReionizatION (HYPERION). These are QSOs whose SMBHs must have had most rapid mass growth during first gigayear Universe therefore acquired largest their respective...
We study the X-ray variability properties of distant AGNs in Chandra Deep Field-South region over 17 years, up to $z\sim 4$, and compare them with those predicted by models based on local samples. use results Monte Carlo simulations account for biases introduced discontinuous sampling low-count regime. confirm that is an ubiquitous property AGNs, no clear dependence density environment. The high-z different temporal timescales, are most consistent a Power Spectral Density (PSD) described...
Hot dust-obscured galaxies (DOGs) are hyperluminous (L8–1000 μm > 1013 L⊙) infrared with extremely high (up to hundreds of K) dust temperatures. The sources powering both their luminosities and temperatures thought be deeply buried rapidly accreting supermassive black holes (SMBHs). DOGs could therefore represent a key evolutionary phase in which the SMBH growth peaks. X-ray observations can used study obscuration levels luminosities. In this work, we present properties 20 most luminous...
We present a multi-wavelength study of seven AGN at spectroscopic redshift >2.5 in the 7 Ms Chandra Deep Field South, selected to have good FIR/sub-mm detections. Our aim is investigate possibility that obscuration observed X-rays can be produced by interstellar medium (ISM) host galaxy. Based on spectra, we measured obscuring column densities N$_{H, X}$ excess 7x10$^{22}$ cm$^{-2}$ and intrinsic X-ray luminosities L$_{X}$>10$^{44}$ erg s$^{-1}$ for our targets, as well equivalent widths Fe...
We have investigated the gas content of a sample several hundred AGN host galaxies at z < 1 and compared it with inactive galaxies, matched in bins stellar mass redshift. Gas masses been inferred from dust masses, obtained by stacked Herschel far-IR sub-mm data GOODS COSMOS fields, under reasonable assumptions metallicity scaling relations for dust-to-gas ratio. find that AGNs are on average hosted much more rich than galaxies. In vast majority bins, hosts is higher The difference up to...
Gas outflows are believed to play a pivotal role in shaping galaxies, as they regulate both star formation and black hole growth. Despite their ubiquitous presence, the origin acceleration mechanism of such powerful extended winds is not yet understood. Direct observations cold gas component objects with detected at other wavelengths needed assess impact outflow on host galaxy interstellar medium (ISM). We observed Plateau de Bure Interferometer an obscured quasar z~1.5, XID2028, for which...
We present a series of new, publicly available mock catalogs X-ray selected active galactic nuclei (AGNs), non-active galaxies, and clusters galaxies. They are based on up-to-date observational results the demographic extragalactic sources their extrapolations.These mocks reach fluxes below 1E-20 erg s-1 cm-2 in 0.5-2 keV band, i.e., more than an order magnitude predicted limits future deep fields, therefore represent important tool for simulating surveys with both current telescopes. use...
Context. Obscured active galactic nuclei (AGN) represent a significant fraction of the entire AGN population, especially at high redshift (∼70% z = 3 − 5). They are often characterized by presence large gas and dust reservoirs that thought to sustain possibly obscure vigorous star formation processes make these objects shine FIR submillimeter wavelengths. Studying physical properties obscured their host galaxies is crucial shedding light on early stages massive system lifetime. Aims. We aim...
The X-ray luminosity function (XLF) of active galactic nuclei (AGN) offers a robust tool to study the evolution and growth supermassive black-hole population over cosmic time. Owing limited area probed by surveys, optical surveys are routinely used probe accretion in high-redshift Universe z ≥ 3. However, may be incomplete because they strongly affected dust redenning. In this work we derive XLF its at high redshifts ( 3) using large sample AGN selected different fields with various areas...