Publications (54)
The COSMOS Wall at z0.73: star-forming galaxies and their evolution in different environments
S. Zhou, A. Iovino, M. Longhetti +11
We present a study of the evolution of star-forming galaxies within the so-called Wall structure at z0.73 in the field of the COSMOS survey. We use a sample of star-forming g…
The population of early-type galaxies: how it evolves with time and how it differs from passive and late-type galaxies
S. Tamburri, P. Saracco, M. Longhetti +3
The aim of our analysis is twofold. On the one hand we are interested in addressing whether a sample of ETGs morphologically selected differs from a sample of passive galaxies in t…
Nebular Emission from Star-Forming Galaxies
S. Charlot, M. Longhetti
We present a new model for computing consistently the line and continuum emission from galaxies, based on a combination of recent population synthesis and photoionization codes. We…
The TESIS project: Are type 2 QSO hidden in X-ray emitting EROs?
P. Severgnini, R. Della Ceca, V. Braito +8
Here we present the results obtained from the analysis of 75 ksec of XMM-Newton observations of a sample of EROs selected from one MUNICS field (K'<19.5 mag). We find 6 EROs with a…
WEAVE First Light Observations: Origin and Dynamics of the Shock Front in Stephan's Quintet
M. I. Arnaudova, S. Das, D. J. B. Smith +62
We present a detailed study of the large-scale shock front in Stephan's Quintet, a byproduct of past and ongoing interactions. Using integral-field spectroscopy from the new Willia…
On the central stellar mass density and the inside-out growth of early-type galaxies
P. Saracco, A. Gargiulo, M. Longhetti
[Abridged] In this paper we derive the central stellar mass density within a fixed radius and the effective stellar mass density within the effective radius for a complete sample o…
Nearby early-type galaxies with ionized gas.I. Line-strength indices of the underlying stellar population
R. Rampazzo, F. Annibali, A. Bressan +3
With the aim of building a data-set of spectral properties of well studied early-type galaxies showing emission lines, we present intermediate resolution spectra of 50 galaxies in…
The Kormendy relation of massive elliptical galaxies at z~1.5. Evidence for size evolution ?
M. Longhetti, P. Saracco, P. Severgnini +6
We present the morphological analysis based on HST-NIC2 (0.075 arcsec/pixel) images in the F160W filter of a sample of 9 massive field (> 10^{11} M_\odot) galaxies spectroscopicall…
Scaling relations of cluster elliptical galaxies at z~1.3. Distinguishing luminosity and structural evolution
P. Saracco, A. Casati, A. Gargiulo +10
[Abridged] We studied the size-surface brightness and the size-mass relations of a sample of 16 cluster elliptical galaxies in the mass range 10^{10}-2x10^{11} M_sun which were mor…
The VIRMOS-VLT Deep Survey
O. Le Fèvre, G. Vettolani, D. Maccagni +30
The aim of the VIRMOS VLT Deep Survey (VVDS) is to study of the evolution of galaxies, large scale structures and AGNs from a sample of more than 150,000 galaxies with measured red…
Tracing the evolution of massive galaxies up to z \sim 3
M. Longhetti, P. Saracco, S. Cristiani +4
A census of massive galaxies at redshift increasingly higher than 1 may provide strong constraints on the history of mass assembly and of star formation. Here we report on t…
High-z massive galaxies in the HDF-South
P. Saracco, M. Longhetti, E. Giallongo +6
[abr] We report the analysis of three galaxies selected in the Hubble Deep Field South at Ks<22 on the basis of their unusually red near-IR color J-K>3. We have used population syn…
The VANDELS ESO public spectroscopic survey: final Data Release of 2087 spectra and spectroscopic measurements
B. Garilli, R. McLure, L. Pentericci +94
VANDELS is an ESO Public Spectroscopic Survey designed to build a sample of high signal to noise, medium resolution spectra of galaxies at redshift between 1 and 6.5. Here we prese…
Understanding the unusual life of the Cartwheel galaxy using stellar populations
F. R. Ditrani, M. Longhetti, M. Fossati +1
RiGs are the result of the impact between two galaxies, with one of them passing close to the centre of the other, piercing its gaseous and stellar disc. In this framework, the imp…
Probing the Nature of EROs through ASTRO-F/AKARI observations
A. Mignano, P. Saracco, M. Longhetti
We present a preliminary analysis of ASTRO-F data of a complete sample of ~150 EROs (R-K>5) down to K(Vega)<19, for which reliable photometric redshifts are available, in the range…
Probing the evolution of the near-IR luminosity function of galaxies to z ~ 3 in the Hubble Deep Field South
P. Saracco, A. Fiano, G. Chincarini +6
[Abridged] We present the rest-frame Js-band and Ks-band luminosity function of a sample of about 300 galaxies selected in the HDF-S at Ks<23 (Vega). We use calibrated photometric…
Star formation history of early-type galaxies in low density environments
M. Longhetti, A. Bressan, C. Chiosi +1
In this paper we analyze the line-strength indices in the Lick-system measured by Longhetti et al. (1998a, b) for a sample of 51 early-type galaxies located in low density environm…
The TESIS project: revealing massive early-type galaxies at z>1
P. Saracco, M. Longhetti, P. Severgnini +8
We present the preliminary results of an on-going near-IR low resolution spectroscopic follow-up of a complete sample of 30 bright (K'<18.5) EROs selected over 360 arcmin^2 from th…
Extremely compact massive galaxies at z~1.4
I. Trujillo, G. Feulner, Y. Goranova +9
The optical rest-frame sizes of 10 of the most massive (~5x10^{11}h_{70}^{-2}M_sun) galaxies found in the near-infrared MUNICS survey at 1.2<z<1.7 are analysed. Sizes were estimate…
Dating the stellar population in massive early-type galaxies at 1.5
M. Longhetti, P. Saracco, P. Severgnini +7
We present the analysis of 10 massive early-type galaxies at . They have been identified by means of a near-IR low resolution spectroscopic follow-up of a complete sample…
Spatially Resolved Colors and Stellar Population Properties in Early-Type Galaxies at z ~ 1.5
A. Gargiulo, P. Saracco, M. Longhetti +2
We present F850LP-F160W color gradients for 11 early-type galaxies (ETGs) at 1.0<z_spec<1.9. Significant negative F850LP-F160W color gradients have been detected in ~70% of our sam…
The BMW Deep X-ray Cluster Survey
L. Guzzo, A. Moretti, S. Campana +7
We briefly describe the main features of the Brera Multi-Wavelet (BMW) survey of serendipitous X-ray clusters, based on the still unexploited ROSAT-HRI archival observations. Clust…
Stellar population properties of individual massive early-type galaxies at 1.4 < z < 2
I. Lonoce, C. Maraston, D. Thomas +4
We analyse publicly available, individual spectra of four, massive () early-type galaxies with redshifts in the range 1.4 < z < 2 to determine their stellar con…
A few StePS forward in unveiling the complexity of galaxy evolution: light-weighted stellar ages of intermediate redshift galaxies with WEAVE
L. Costantin, A. Iovino, S. Zibetti +29
The upcoming new generation of optical spectrographs on four-meter-class telescopes will provide invaluable information for reconstructing the history of star formation in individu…
The evolution of the morphological scale of early-type galaxies since z=2
P. Saracco, M. Longhetti, S. Andreon +1
We present the morphological analysis based on HST-NICMOS observations in the F160W filter of a sample of 30 early-type galaxies spectroscopically confirmed at 1.2<z<2. We derive t…
The TNG EROs Spectroscopic Identification Survey (TESIS)
P. Saracco, M. Longhetti, R. Della Ceca +8
We are carrying on a near-IR very low resolution spectroscopic follow-up in parallel with XMM-Newton observations of a complete sample of ~30 bright (K'<18.5) Extremely Red Objects…
TESIS - The TNG EROs Spectroscopic Identification Survey
P. Saracco, M. Longhetti, P. Severgnini +8
A near-IR low-resolution spectroscopic follow-up of a complete sample of K<18.5 EROs has started at the 3.5 m Telescopio Nazionale Galileo (TNG, La Palma, Canary Islands) by using…
Looking for obscured QSOs in the X-ray emitting ERO population
P. Severgnini, R. Della Ceca, V. Braito +8
We present XMM-Newton data centered on one of the MUNICS Near Infrared Cluster Survey fields (S2F1) and we discuss the X-ray properties of the 6 X-ray emitting EROs found. For one…
Why the Northern Hemisphere Needs a 30-40m Telescope and the Science at Stake: Shaping Galaxies and Their Stars with Stellar Population Gradients, IMF Variations and Environmental Drivers in Cluster Early-Type Galaxies
A. Vazdekis, P. Sánchez-Blázquez, A. Ferré-Mateu +23
This white paper highlights how stellar population gradients, chemical abundance patterns, stellar initial mass function (IMF) variations, and structural signatures in early-type g…
Constraining the star formation and the assembly histories of normal and compact early-type galaxies at 1<z<2
P. Saracco, M. Longhetti, A. Gargiulo
[Abridged]We present a study based on a sample of 62 early-type galaxies (ETGs) at 0.9<z_spec<2 aimed at constraining their past star formation and mass assembly histories. The sam…
Star Formation, Metallicity and Dust Properties Derived from the SAPM Galaxy Survey Spectra
S. Charlot, G. Kauffmann, M. Longhetti +4
We have derived star formation rates (SFRs), gas-phase oxygen abundances and effective dust absorption optical depths for a sample of galaxies drawn from the Stromlo-APM redshift s…
Stellar population gradients at cosmic noon as a constraint to the evolution of passive galaxies
F. R. Ditrani, S. Andreon, M. Longhetti +1
Context: The radial variations of the stellar populations properties within passive galaxies at high redshift contain information about their assembly mechanisms, based on which ga…
Colour gradients in normal and compact early-type galaxies at 1<z<2
A. Gargiulo, P. Saracco, M. Longhetti
We have derived colour gradients for a sample of 20 early-type galaxies (ETGs) at 1 < z_spec < 2 selected from the GOODS-South field. The sample includes both normal ETGs (13) havi…
The velocity field of the Lyra complex
M. Girardi, W. Boschin, S. De Grandi +7
The formation of cosmic structure culminates with the assembly of galaxy clusters, a process quite different from cluster to cluster. We present the study of the structure and dyna…
Lower mass normalization of the stellar initial mass function for dense massive early-type galaxies at z ~ 1.4
A. Gargiulo, P. Saracco, M. Longhetti +3
This paper aims at understanding if the normalization of the stellar initial mass function (IMF) of massive early-type galaxies (ETGs) varies with cosmic time and/or with mean stel…
The number density of superdense early-type galaxies at 1<z<2 and the local cluster galaxies
P. Saracco, M. Longhetti, A. Gargiulo
Many of the early-type galaxies observed so far at z>1 turned out to have smaller radii with respect to that of a typical present-day early-type galaxy with comparable mass. This h…
SHARP -- A spectrograph proposal to fully exploit ELT capabilities and look beyond JWST
P. Saracco, P. Conconi, C. Arcidiacono +47
The Extremely Large Telescopes (ELTs), with their large apertures and cutting-edge Multi-Conjugate Adaptive Optics (MCAO) systems, promise to deliver data that is both sharper and…
The density of very massive evolved galaxies to z~1.7
P. Saracco, M. Longhetti, P. Severgnini +8
We spectroscopically identified 7 massive evolved galaxies with magnitudes 17.8<K<18.4 at 1.3<z<1.7 over an area of ~160 arcmin^2 of the MUNICS survey. Their rest-frame K-band abso…
SHARP: Beyond JWST -- Revealing the galaxy birth and growth with the resolution of the ELT
P. Saracco, P. Conconi, C. Arcidiacono +37
A deep understanding of the life-cycle of galaxies, particularly those of high mass, requires clarifying the mechanisms that regulate star formation (SF) and its abrupt shutdown (q…
Massive z ~ 1.3 evolved galaxies revealed
P. Saracco, M. Longhetti, P. Severgnini +8
We present the results of TNG near-IR low resolution spectroscopy of two (S7F5-254 and S7F5-45) sources belonging to a complete sample of 15 EROs with K'<18 and R-K'>5 selected fro…
The Brera Multi-scale Wavelet HRI Cluster Survey: I Selection of the Sample and Number Counts
A. Moretti, L. Guzzo, S. Campana +7
We describe the construction of the Brera Multi-scale Wavelet (BMW) HRI Cluster Survey, a deep sample of serendipitous X-ray selected clusters of galaxies based on the ROSAT HRI ar…
From simulations to observations. Methodology and data release of mock TNG50 galaxies at 0.3 < z < 0.7 for WEAVE-StePS
A. Ikhsanova, L. Costantin, A. Pizzella +17
The new generation of optical spectrographs (i.e., WEAVE, 4MOST, DESI, and WST) offer unprecedented opportunities for statistically studying the star formation histories of galaxie…
Spectral detection of multiple stellar populations in z~1 early-type galaxies
I. Lonoce, M. Longhetti, P. Saracco +2
We present a spectroscopic analysis based on measurements of two mainly age-dependent spectrophotometric indices in the 4000A rest frame region, i.e. H+K(CaII) and Delta4000, for a…
The population of early-type galaxies at 1<z<2 - New clues on their formation and evolution
P. Saracco, M. Longhetti, S. Andreon
[Abridged]We present the morphological analysis based on HST-NICMOS observations in the F160W filter of a sample of 32 early-type galaxies (ETGs) at 1<z<2 with spectroscopic confir…
Probing IMF Variations in High-Redshift Early-Type Galaxies with SHARP
F. La Barbera, G. De Lucia, F. Ditrani +9
The stellar initial mass function (IMF), which describes the distribution of stellar masses at birth, is a fundamental ingredient in shaping galaxy evolution. Recent observations i…
A big step forward with SHARP: spatially resolved stellar population properties in passive galaxies at z > 1.5
A. Gargiulo, C. Mancini, F. R. Ditrani +6
Understanding when and how massive quiescent galaxies (log(M*/Msun) > 10.5) assembled their stellar mass and quenched remains a central challenge in galaxy evolution. Spatially res…
SHARP -- A near-IR multi-mode spectrograph conceived for MORFEO@ELT
P. Saracco, P. Conconi, C. Arcidiacono +50
The Extremely Large Telescopes (ELTs), thanks to their large apertures and cutting-edge Multi-Conjugate Adaptive Optics (MCAO) systems, promise to deliver sharper and deeper data e…
Stellar metallicity from optical and UV spectral indices: Test case for WEAVE-StePS
F. R. Ditrani, M. Longhetti, F. La Barbera +35
The upcoming generation of optical spectrographs on four meter-class telescopes, with their huge multiplexing capabilities, excellent spectral resolution, and unprecedented wavelen…
Retrieval of the physical parameters of galaxies from WEAVE-StePS-like data using machine learning
J. Angthopo, B. R. Granett, F. La Barbera +46
The WHT Enhanced Area Velocity Explorer (WEAVE) is a new, massively multiplexing spectrograph. This new instrument will be exploited to obtain high S/N spectra of 25000 galax…
Star Formation History of Early-Type Galaxies in Low Density Environments V. Blue line-strength indices for the nuclear region
M. Longhetti, A. Bressan, C. Chiosi +1
We analyze the star formation properties of a sample of 21 shell galaxies and 30 early-type galaxies members of interacting pairs, located in low density environments (Longhetti et…
Growing in number, passive in nature: tracing the evolution of the most massive quiescent galaxies since z ~ 0.8 with BOSS and DESI
F. R. Ditrani, M. Fossati, M. Longhetti +5
Luminous Red Galaxies (LRGs) are among the most massive galaxies at any epoch, and lack ongoing star formation. As systems hosting most of the baryonic mass in the local Universe,…
The COSMOS Wall at z ~ 0.73: Quiescent galaxies and their evolution in different environments
F. R. Ditrani, M. Longhetti, A. Iovino +12
The evolution of quiescent galaxies is driven by numerous physical processes, often considered to be related to their stellar mass and environment over cosmic time. Tracing their s…
WEAVE-StePS. A stellar population survey using WEAVE at WHT
A. Iovino, B. M. Poggianti, A. Mercurio +44
The upcoming new generation of optical spectrographs on four-meter-class telescopes will provide valuable opportunities for forthcoming galaxy surveys through their huge multiplexi…
Superdense and normal early-type galaxies at 1<z<2
P. Saracco, M. Longhetti, A. Gargiulo
We combined proprietary and archival HST observations to collect a sample of 62 early-type galaxies (ETGs) at 0.9<z<2 with spectroscopic confirmation of their redshift and spectral…