A5066808197- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- History and Developments in Astronomy
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- Historical Astronomy and Related Studies
- Radio Astronomy Observations and Technology
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Remote Sensing in Agriculture
- Atmospheric Ozone and Climate
- Impact of Light on Environment and Health
- History of Science and Medicine
- Atmospheric aerosols and clouds
- Plant Water Relations and Carbon Dynamics
- CCD and CMOS Imaging Sensors
- Astro and Planetary Science
- Superconducting and THz Device Technology
Arcetri Astrophysical Observatory
2015-2024
ASTRO-3D
2021
National Institute for Astrophysics
2007-2021
ARC Centre of Excellence for All-sky Astrophysics
2021
Institute for Space Astrophysics and Planetology
2018
Roma Tre University
2016
Universidade Federal do Rio Grande do Sul
2009
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2002-2008
European Southern Observatory
2001-2006
Max Planck Institute for Astronomy
2002-2003
The presence of dust at high redshift requires efficient condensation grains in SN ejecta, accordance with current theoretical models.Yet, observations the few well studied SNe and remnants imply efficiencies which are about two orders magnitude smaller.Motivated by this tension, we have (i) revisited model Todini & Ferrara (2001) for formation ejecta core collapse (ii) followed, first time, evolution newly condensed from time to their survival -through passage reverse shock -in remnant.We...
With the aim of investigating whether stellar sources can account for ≥108 M⊙ dust masses inferred from mm/sub-mm observations samples 5 < z 6.4 quasars, we develop a chemical evolution model which follows metals and on characteristic lifetimes, taking into destruction mechanisms. Using grid yields as function initial mass metallicity over range 1–40 0–1 Z⊙, show that role asymptotic giant branch (AGB) stars in cosmic at high redshift might have been overlooked. In particular, find (i)...
We combine new Herschel/SPIRE sub-millimeter observations with existing multiwavelength data to investigate the dust scaling relations of Herschel Reference Survey, a magnitude-, volume-limited sample ~300 nearby galaxies in different environments. show that dust-to-stellar mass ratio anti-correlates stellar mass, surface density and NUV-r colour across whole range parameters covered by our sample. Moreover, decreases significantly when moving from late- early-type galaxies. These are...
We present Herschel observations of 62 early-type galaxies (ETGs), including 39 morphologically classified as S0+S0a and 23 ellipticals using SPIRE at 250, 350, 500 μm part the volume-limited Reference Survey (HRS). detect dust emission in 24% 62% S0s. The mean temperature is 〈Td〉 = 23.9 ± 0.8 K, warmer than that found for late-type Virgo Cluster. mass entire detected sample logMd 6.1 0.1 M☉ with a dust-to-stellar-mass ratio log(Md/M*) −4.3 0.1. Including non-detections, these parameters are...
We gather infrared (IR) photometric data from 8 to 500 microns (Spitzer, WISE, IRAS and Herschel) for all of the HRS galaxies. Draine & Li (2007) models are fit which stellar contribution has been carefully removed. find that our coverage is sufficient constrain parameters a strong constraint on 20-60 range mandatory estimate relative photo-dissociation regions IR SED. The SED tend systematically under-estimate observed flux densities, especially low mass systems. provide output galaxies:...
We present a semi-analytical model for the formation and evolution of high redshift quasar (QSO). reconstruct set hierarchical merger histories 10^13 Msun dark matter halo corresponding galaxy its central super massive black hole. The code GAMETE/QSODUST consistently follows: hole assembly via both coalescence with other holes gas accretion; build up star history host galaxy, driven by binary mergers mass gas, stars, metals in interstellar medium (ISM), accounting exchanges external (infall...
We describe the Herschel Virgo Cluster Survey (HeViCS) and first data obtained as part of Science Demonstration Phase (SDP). The cover a central 4x4 sq deg region cluster. use SPIRE PACS photometry to produce 100, 160, 250, 350 500 micron luminosity functions (LFs) for optically bright galaxies that are selected at detected in all bands. compare these LFs with those previously derived using IRAS, BLAST Herschel-ATLAS data. do not have large numbers faint or examples very luminous seen...
We analyze the optical-near infrared spectra of 33 quasars with redshifts 3.9<z<6.4 to investigate properties dust extinction at these cosmic epochs. The SMC curve has been shown reproduce reddening most z<2.2; we whether this also provides a good description higher redshifts. fit observed synthetic absorbed quasar templates obtained by varying intrinsic slope (alpha), absolute (A3000), and using grid empirical theoretical curves. find that seven in our sample are affected substantial (A3000...
The Herschel Reference Survey (HRS) is a guaranteed time key project aimed at studying the physical properties of interstellar medium in galaxies nearby universe. This volume limited, K-band selected sample composed spanning whole range morphological types (from ellipticals to late-type spirals) and environments field centre Virgo Cluster). We present flux density measurements 323 HRS three bands Spectral Photometric Imaging Receiver (SPIRE), 250, 350 500 microns. Aperture photometry...
We explore the minimal conditions which enable formation of metal-enriched solar and subsolar-mass stars. Using a one-zone semi-analytical model, we accurately follow chemical thermal evolution gas with aim understanding how initial metal dust content alters cooling fragmentation properties, hence characteristic stellar mass. find that in absence grains, occurs at densities nH∼ [104–105] cm−3 when metallicity exceeds Z∼ 10−4 Z⊙. The resulting masses are ≥10 M⊙. inclusion Fe Si does not...
I show here that the bulk of dust mass in a galaxy can be equivalently estimated from: i) full spectral energy distribution emission, using approach Draine & Lee (2007) includes grains and range interstellar radiation field intensities; ii) emission wavelength 100um <= lambda 500um (covered by Herschel Space Observatory), fitting to data simpler single temperature modified blackbody. Recent claims on contrary (Dale et al. 2012) should interpreted as caveat use fits an absorption cross...
We present Herschel/PACS 100 and 160 µm integrated photometry for the 323 galaxies in Herschel Reference Survey (HRS), a K-band, volume-limited sample of local Universe.Once combined with Herschel/SPIRE observations already available, these data make HRS largest representative nearby homogeneous coverage across 100-500 wavelength range.In this paper, we take advantage unique set to investigate properties shape far-infrared/submillimetre spectral energy distribution galaxies.We show that,...
The purpose of this work is the characterization radial distribution dust, stars, gas, and star-formation rate (SFR) in a sub-sample 18 face-on spiral galaxies extracted from DustPedia sample. This study performed by exploiting multi-wavelength, UV to sub-mm bands, database, addition molecular (12CO) atomic (HI) gas maps metallicity abundance information available literature. We fitted surface brightness profiles tracers dust mass density total SFR with an exponential curve derived their...
Within the framework of DustPedia project we investigate properties cosmic dust and its interaction with stellar radiation (originating from different populations) for 814 galaxies in nearby Universe, all observed by Herschel Space Observatory. We take advantage widely used galaxy SED fitting code CIGALE, properly adapted to include state-of-the-art model THEMIS. Using photometry determine physical galaxies, such as, mass, star-formation rate, bolometric luminosity as well unattenuated...
We have fit the far-ultraviolet (FUV) to sub-millimeter (850 micron) spectral energy distributions (SEDs) of 61 galaxies from "Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel" (KINGFISH). The fitting has been performed using three models: Code for Investigating GALaxy Evolution (CIGALE), GRAphite-SILicate approach (GRASIL), and Multi-wavelength Analysis Galaxy PHYSical properties (MAGPHYS). analyzed results codes in terms SED shapes, by comparing derived quantities...
Methods. We have modelled a sample of ~800 nearby galaxies, spanning wide range metallicity, gas fraction, specific star formation rate and Hubble stage. derived the dust properties each object from its spectral energy distribution. Through an additional level analysis, we inferred timescales condensation in core-collapse supernova ejecta, grain growth cold clouds destruction by shock waves. Throughout this paper, adopted hierarchical Bayesian approach, resulting single large probability...
By combining <i>Herschel<i/>-SPIRE observations obtained as part of the <i>Herschel<i/> Virgo Cluster Survey with 21 cm Hi data from literature, we investigate role cluster environment on dust content spiral galaxies. We show for first time that extent disk is significantly reduced in Hi-deficient galaxies, following remarkably well observed "truncation" disk. The ratio submillimetre-to-optical diameter correlates Hi-deficiency, suggesting able to strip gas. These results provide important...
The standard method for estimating the mass of interstellar medium (ISM) in a galaxy is to use 21 cm line trace atomic gas and CO 1–0 molecular gas. In this paper, we investigate alternative technique using continuum dust emission estimate all phases ISM. Using Herschel observations 10 galaxies from Reference Survey Virgo Cluster Survey, show that detected by mostly has temperature emissivity index similar local ISM our galaxy, with generally increasing toward center each galaxy. We...
The Herschel Virgo Cluster Survey (HeViCS) is the deepest, confusion-limited survey of at far-infrared (FIR) wavelengths. entire full depth covers $\sim$55 sq. deg. in 5 bands (100-500 \micron), encompassing areas around central dominant elliptical galaxies (M87, M86 & M49) and extends as far NW cloud, W cloud Southern extension. beyond this region with lower sensitivity so that total area covered 84 In paper we describe data, data acquisition techniques present detection rates optically...
Using the far-infrared emission, as observed by Herschel Virgo Cluster Survey (HeViCS), and integrated HI CO brightness, we infer dust total gas mass for a magnitude limited sample of 35 metal rich spiral galaxies in Virgo. The flux correlates tightly linearly with fluxes Herschel. Molecules these are more closely related to cold rather than heated star formation or optical/NIR brightness. We show that establishes stronger correlation atomic molecular component alone. dust-to-gas ratio...
Dust grains are classically thought to form in the winds of AGB stars. However, nowadays there is increasing evidence for dust formation SNe. In order establish relative importance these two classes stellar sources it important know what fraction freshly formed SN ejecta that able survive passage reverse shock and be injected interstellar medium. With this aim, we have developed a new code, GRASH_Rev, allows follow dynamics shocked compute time evolution mass, composition size distribution...