F. Annibali
A5080497476- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Impact of Light on Environment and Health
- Astrophysics and Cosmic Phenomena
- Optical Systems and Laser Technology
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Nuclear physics research studies
- Advanced optical system design
- Cephalopods and Marine Biology
- Historical Astronomy and Related Studies
- Spectroscopy and Laser Applications
- Image Processing and 3D Reconstruction
- Experimental and Theoretical Physics Studies
- Solar Radiation and Photovoltaics
- Advanced Statistical Methods and Models
- Atomic and Subatomic Physics Research
Osservatorio di Astrofisica e Scienza dello Spazio
2018-2025
National Institute for Astrophysics
2010-2024
Osservatorio astronomico di Bologna
2001-2017
University of Bologna
2016
Osservatorio Astronomico di Padova
2004-2011
Space Telescope Science Institute
2006-2009
Martin University
2009
Scuola Internazionale Superiore di Studi Avanzati
2003-2007
Michigan Science Center
2007
National Institute of Astrophysics, Optics and Electronics
2004
The current standard model of cosmology successfully describes a variety measurements, but the nature its main ingredients, dark matter and energy, remains unknown. is medium-class mission in Cosmic Vision 2015--2025 programme European Space Agency (ESA) that will provide high-resolution optical imaging, as well near-infrared imaging spectroscopy, over about 14\,000\,deg$^2$ extragalactic sky. In addition to accurate weak lensing clustering measurements probe structure formation half age...
The Euclid ERO showcase Euclid's capabilities in advance of its main mission by targeting 17 astronomical objects, including galaxy clusters, nearby galaxies, globular and star-forming regions. A total 24 hours observing time was allocated the early months operation, scientific community engaged through an public data release. We describe development pipeline to create visually compelling images while simultaneously meeting demands within launch leveraging a pragmatic data-driven strategy....
A candidate diffuse stellar substructure was previously reported in the halo of nearby dwarf starburst galaxy NGC 4449 by Karachentsev et al. We map and analyze this feature using a unique combination deep integrated-light images from Black Bird 0.5-meter telescope, high-resolution wide-field 8-meter Subaru which resolve nebulosity into stream red giant branch stars, confirm its physical association with 4449. The properties imply massive spheroidal progenitor, after complete disruption will...
We present a detailed JWST/NIRSpec and NIRCam analysis of gravitationally lensed galaxy ( μ = 17 − 21) at redshift 6.14 magnified by the Hubble Frontier Field cluster MACS J0416. The target is typical compact UV-faint M UV −17.8) Lyman- α emitter, yet large magnification allows characterization structures on sub-galactic scales (down to few parsecs). Prominent optical H , β [O III ] λλ 4959, 5007 lines are spatially resolved with high-spectral-resolution grating (G395H, R 2700), equivalent...
We present new V- and I-band HST ACS photometry of I Zw 18, the most metal-poor blue compact dwarf (BCD) galaxy in nearby universe. It has been argued past that 18 is a very young system started forming stars only ≲500 Myr ago, but other work hinted older (≳1 Gyr) red giant branch (RGB) may also exist. Our data, once combined with archival provide deep uncontaminated optical color-magnitude diagram (CMD) now strongly indicates an RGB. The RGB tip (TRGB) magnitude yields distance modulus (m -...
Aims.The paper is devoted to the study of underlying stellar population a sample 65 nearby early-type galaxies, predominantly located in low density environments, large fraction which show emission lines.
[ABRIDGED] With the aim of constraining source excitation and origin ionized gas in early-type galaxies (ETGs), we analyzed optical spectra a sample 65 ETGs mostly located low density environments. Optical emission lines are detected 89% sample. The incidence strength do not correlate either with E/S0 classification, or fast/slow rotator classification. Comparing nuclear r<r_e/16 line classical [OIII]/Hb vs [NII]/Ha diagnostic diagram, galaxy activity is so classified: 72% LINERs, 9%...
We present JWST/Near Infrared Spectrograph (NIRSpec) integral field spectroscopy (IFS) of a lensed Population III candidate stellar complex (dubbed Lensed And Pristine 1, LAP1), with lensing-corrected mass ≲10 4 M ⊙ and an absolute luminosity UV > −11.2 ( m 35.6), confirmed at redshift 6.639 ± 0.004. The system is strongly amplified μ ≳ 100) by straddling critical line the Hubble Frontier Field galaxy cluster MACS J0416. Although continuum currently not detected in Camera (NIRCam) Near...
Using the third data release of Sloan Digital Sky Survey (SDSS), we have rigorously defined a volume-limited sample early-type galaxies in redshift range 0.005 < z≤ 0.1. We density local environment for each galaxy using method which takes account bias introduced by survey boundaries if traditional methods are used. At luminosities greater than our absolute r-band magnitude cut-off −20.45, mean shows no trend with redshift. calculate Lick indices entire and correct aperture effects velocity...
We have derived the star formation history (SFH) of blue compact dwarf galaxy IZw18 through comparison deep HST/ACS data with synthetic color magnitude diagrams. A statistical analysis was implemented for identification best-fit SFH and relative uncertainties. confirm that is not a truly young galaxy, having started forming stars earlier than ~1 Gyr ago, possibly at epochs as old Hubble time. In IZw18's main body we infer lower limit ~2 x 10^{6} M_sun mass locked-up in stars. IZw18' s has...
Abstract We present the results of deep Hubble Space Telescope photometry dwarf galaxy DDO 68-C, proposed as possibly associated with isolated peculiar 68. The new data resolve for first time stars 68-C down to well below tip red giant branch (RGB), revealing a low-mass ( M ⋆ ≃ 1.5 × 10 7 ⊙ ) star-forming backbone old stars. By means fully homogeneous analysis and using RGB standard candle, we find that 68 lie at same distance from us, within uncertainties D = 12.6 ± 0.3 Mpc 12.7 0.4 Mpc,...
We present GALEX far-ultraviolet (FUV, $\lambda_{eff}$=1538 \AA) and near-ultraviolet (NUV, $\lambda_{eff}$=2316 surface photometry of 40 early-type galaxies (ETGs) selected from a wider sample 65 nearby ETGs showing emission lines in their optical spectra. derive FUV NUV brightness profiles, (FUV-NUV) colour profiles D$_{25}$ integrated magnitudes. extend the photometric study to {\it r} band SDSS imaging for 14 these ETGs. In general, radial become redder with galactocentric distance both...
We present new photometry of the dwarf irregular galaxy DDO 68, one most metal-poor and least massive dwarfs, located in Lynx-Cancer Void. The images were acquired with Large Binocular Telescope g r passbands, show unequivocally that 68 has previously unknown stellar streams related to accretion at two smaller companions: a flea fleas biting it, put it Jonathan Swift's words. Our data provide direct observational evidence multiple merging occurring very low galactic mass scales. results an...
We present photometry with the Advanced Camera for Surveys (ACS) on Hubble Space Telescope (HST) of stars in Magellanic starburst galaxy NGC 4449. The has been imaged F435W (B), F555W (V) and F814W (I) broad-band filters, F658N (Halpha) narrow-band filter. Our includes ~300,000 objects (B, V) color-magnitude diagram (CMD) down to V < 28, ~400,000 (V, I) CMD, I 27 . A subsample ~200,000 photometrized all three bands simultaneously. features observed CMDs imply a variety stellar ages up at...
We present low resolution Spitzer-IRS spectra of 40 ETGs, selected from a sample 65 ETGs showing emission lines in their optical spectra. homogeneously extract the mid-infrared (MIR) spectra, and after proper subtraction "passive" ETG template, we derive intensity ionic molecular polycyclic aromatic hydrocarbon features. use MIR diagnostic diagrams to investigate powering mechanisms ionized gas. The early-type galaxies show variety spectral characteristics. empirically sub-divide into five...
With the aim of characterizing rejuvenation processes in early-type galaxies, we analyzed five barred S0 galaxies showing prominent outer ring ultraviolet (UV) imaging. We GALEX far- (FUV) and near- (NUV) UV optical data using stellar population models estimated age mass entire UV-bright structures. Outer rings consist young (<200 Myr old) populations, accounting for up to 70% FUV flux but containing only a few % total mass. Integrated photometry whole places four these objects on green...
We present a study of the star cluster population in starburst irregular galaxy NGC 4449 based on B, V, I, and Hα images taken with Advanced Camera for Surveys Hubble Space Telescope. derive properties such as size, ellipticity, total magnitude. Cluster ages masses are derived fitting observed spectral energy distributions different synthesis models. Our analysis is strongly affected by age–metallicity degeneracy; however, if we assume metallicity ∼1/4 solar, from spectroscopy H ii regions,...
Hierarchical structure in ultraviolet images of 12 late-type LEGUS galaxies is studied by determining the numbers and fluxes nested regions as a function size from ~1 to ~200 pc, number flux. Two starburst dwarfs, NGC 1705 5253, have steeper number-size flux-size distributions than others, indicating high fractions projected areas filled with star formation. Nine subregions 7 similarly steep slopes, even when whole shallower slopes. The results suggest that hierarchically structured...
MORFEO is a post-focal adaptive optics module that forms part of the first light instrument suite for Extreme Large Telescope (ELT). The project now in Final Design Phase. In this paper, we report status project.