A5056122318- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Spectroscopy and Laser Applications
- Scientific Research and Discoveries
- History and Developments in Astronomy
- CCD and CMOS Imaging Sensors
- Radio Astronomy Observations and Technology
- Planetary Science and Exploration
- Optical Systems and Laser Technology
- Advanced optical system design
- Calibration and Measurement Techniques
- Impact of Light on Environment and Health
- Superconducting and THz Device Technology
- Remote Sensing in Agriculture
- Geophysics and Gravity Measurements
Arcetri Astrophysical Observatory
2016-2025
National Institute for Astrophysics
2007-2022
University of Florence
1993-2015
Center for Astrophysics Harvard & Smithsonian
2012
Istituto di Radioastronomia di Bologna
2003-2011
Institute for Space Astrophysics and Planetology
2011
I.R.C.C.S. Oasi Maria SS
2002-2006
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2003-2005
Wellcome Centre for Anti-Infectives Research
1999
Max Planck Institute for Astronomy
1993
We show that the mass-metallicity relation observed in local universe is due to a more general between stellar mass M*, gas-phase metallicity and SFR. Local galaxies define tight surface this 3D space, Fundamental Metallicity Relation (FMR), with small residual dispersion of ~0.05 dex metallicity, i.e, ~12%. At low mass, decreases sharply increasing SFR, while at high does not depend on High redshift galaxies, up z~2.5 are found follow same FMR defined by SDSS no indication evolution. The...
We present initial results of an ESO-VLT large programme (AMAZE) aimed at determining the evolution mass-metallicity relation z>3 by means deep near-IR spectroscopy. Gas metallicities are measured, for sample nine star forming galaxies z~3.5, optical nebular lines redshifted into near-IR. Stellar masses accurately determined using Spitzer-IRAC data, which rest-frame stellar light in these distant galaxies. When compared with previous surveys, inferred z~3.5 shows much stronger than observed...
Type Ia supernovae (SNe Ia) are important distance indicators, element factories, cosmic-ray accelerators, kinetic-energy sources in galaxy evolution, and end points of stellar binary evolution. It has long been clear that a SN must be the runaway thermonuclear explosion degenerate carbon-oxygen core, most likely white dwarf (WD). However, specific progenitor systems SNe Ia, processes lead to their ignition, have not identified. Two broad classes considered: single-degenerate (SD), which WD...
This is the third paper of a series in which we present new measurements observed rates supernovae (SNe) local Universe, determined from Lick Observatory Supernova Search (LOSS). We have considered sample about 1000 SNe and used an optimal subsample 726 (274 Ia, 116 Ibc, 324 II) to determine our rates. study trend as function few quantities available for galaxy sample, such luminosity B K bands, stellar mass, morphological class. discuss different choices (SN samples, input SN functions,...
We compute the rate of supernovae (SNe) different types along Hubble sequence normalized to near-infrared luminosity and stellar mass parent galaxies. This is made possible by new complete catalog galaxy magnitudes obtained 2MASS. find that rates all SN types, including Ia, Ib/c II, show a sharp dependence on both morphology () colors galaxies and, therefore, star formation activity. In particular we find, with high statistical significance, type Ia in late factor ~20 higher than E/S0....
We use recent observations of the evolution Type Ia supernova (SN Ia) rate with redshift, dependence SN on colours parent galaxies, and enhancement in radio-loud early-type galaxies to derive robust empirical grounds, delay time distribution (DTD) between formation progenitor star its explosion as an SN. Our analysis finds: (i) times long 3–4 Gyr, derived from SNe at high cannot reproduce radio-luminosity observed local Universe; (ii) comparison rates a grid theoretical 'single-population'...
We present the first results of a project, LSD, aimed at obtaining spatially-resolved, near-infrared spectroscopy complete sample Lyman-Break Galaxies z~3. Deep observations with adaptive optics resulted in detection main optical lines, such as [OII], Hbeta and [OIII], which are used to study sizes, SFRs, morphologies, gas-phase metallicities, gas fractions effective yields. Optical, near-IR Spitzer/IRAC photometry is measure stellar mass. obtain that morphologies usually complex, presence...
We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for total 76 GRBs, and present an additional three pre-Swift not included in earlier sample. Furthermore, we publish 840 new points 42 GRB afterglows, sets 050319, 050408, 050802, 050820A, 050922C, 060418, 080413A 080810. analyzed light curves all derived spectral energy distributions with best quality, allowing us estimate host...
We use deep Herschel PACS and SPIRE observations in GOODSS, GOODSN COSMOS to estimate the average dust mass (Mdust) of galaxies on a redshift-stellar (Mstar)-SFR grid. study scaling relations between Mdust, Mstar SFR at z<=2.5. No clear evolution Mdust is observed fixed Mstar. find tight correlation likely consequence Schmidt-Kennicutt (S-K) law. The Mstar-Mdust by previous works flattens or sometimes disappears when fixing SFR. Most it derives from combination Mdust-SFR Mstar-SFR...
ABSTRACT The relationships between stellar mass, gas-phase metallicity and star-formation rate (i.e. the mass–metallicity, MZR, fundamental relation, FMR) in local Universe are revisited by fully anchoring determination for SDSS galaxies on Te abundance scale defined exploiting strong-line calibrations presented Curti et al. Self-consistent measurements allow a more unbiased assessment of scaling relations involving M, Z SFR, which provide powerful constraints chemical evolution models. We...
Gamma-ray bursts (GRBs) have been separated into two classes, originally along the lines of duration and spectral properties, called "short/hard" "long/soft." The latter conclusively linked to explosive deaths massive stars, while former are thought result from merger or collapse compact objects. In recent years, indications accumulating that short/hard versus long/soft division does not map directly onto what would be expected classes progenitors, leading a new classification scheme Type I...
We derive new empirical calibrations for strong-line diagnostics of gas phase metallicity in local star forming galaxies by uniformly applying the Te method over full range probed Sloan Digital Sky Survey (SDSS). To measure electron temperatures at high metallicity, where auroral lines needed are not detected single galaxies, we stacked spectra more than 110,000 from SDSS bins log[O II]/H$\beta$ and III]/H$\beta$. This stacking scheme does assume any dependence on mass or formation rate, but...
Quasar feedback in the form of powerful outflows is invoked as a key mechanism to quench star formation galaxies, preventing massive galaxies overgrow and producing red colors ellipticals. On other hand, some models are also requiring "positive" active galactic nucleus feedback, inducing host galaxy through enhanced gas pressure interstellar medium. However, finding observational evidence effects both types still one main challenges extragalactic astronomy, few observations energetic...
AGN-driven outflows are invoked by galaxy evolutionary models to quench star formation and explain the origin of relations observed locally between super massive black holes their host galaxies. This work aims detect presence extended ionised in luminous quasars where we expect maximum activity both hole accretion. Currently, there only a few studies based on spatially resolved observations at high redshift, $z>2$. We analyse sample six (${\rm L>10^{47} \ erg/s}$) $z\sim2.4$, H-band using...
We analyse the chemical properties of three z~8 galaxies behind galaxy cluster SMACS J0723.3-7327, observed as part Early Release Observations programme James Webb Space Telescope (JWST). Exploiting [O III]4363 auroral line detections in NIRSpec spectra, we robustly apply direct Te method for very first time at such high redshift, measuring metallicities ranging from extremely metal poor (12+log(O/H)~7) to about one-third solar. also discuss excitation these sources, and compare them with...
The evolution of the content heavy elements in galaxies, relative chemical abundances, their spatial distribution, and how these scale with various galactic properties, provide unique information on evolutionary processes across cosmic epochs. In recent years major progress has been made constraining galaxies inferring key relevant to our understanding main mechanisms involved galaxy evolution. this review we an overview areas. After methods used constrain enrichment environment, discuss...
We report J, H, and K photometry of 86 stars in 40 fields the Northern Hemisphere. The are smaller than or comparable to a 4' × field view roughly uniformly distributed over sky, making them suitable for homogeneous broadband calibration network near-infrared panoramic detectors. magnitudes range from 8.5 14 J-K colors, -0.2 1.2. is derived total 3899 reduced images; each star has been measured, on average, 26.0 times per filter 5.5 nights. Typical errors ∼0.012 mag.
We have observed 28 local galaxies in the wavelength range between 1 and 2.4 μm order to define template spectra of normal along Hubble sequence. Five per morphological type were most cases, resulting rms spread normalized each class, including both intrinsic differences observational uncertainties, is about cent K, 2 H 3 J. Many absorption features can be accurately measured. The target spectroscopic aperture (7×53 arcsec2) chosen similar those used by Kinney et al. UV optical spectra. two...
The optical rest-frame sizes of 10 the most massive (~5x10^{11}h_{70}^{-2}M_sun) galaxies found in near-infrared MUNICS survey at 1.2<z<1.7 are analysed. Sizes were estimated both J and K' filters. These least a factor 4_{-1.0}^{+1.9} (+-1 sigma) smaller V-band than local counterparts same stellar mass. Consequently, mass density these objects is (at least) 60 times larger ellipticals today. Although populations passively fading, their structural properties rapidly changing since that...