My research interests are mainly in the field of observational extragalactic Astronomy, mostly focusing on the formation and evolution of galaxies. Below you can read about the most recent projects I am involved in.


WINGS (WIde-field Nearby Galaxy-cluster Survey: Fasano et al. 2006) is a wide-field and multiwavelength survey of 76 galaxy clusters in the local Universe. The sample consists of all clusters at 0.04 <z< 0.07 in both hemispheres at Galactic latitude | b | > 20 selected from the ROSAT X-ray-Brightest Abell-type Cluster Sample, the Brightest Cluster Sample, and its extensions. The WINGS survey is based on B and V imaging for the 76 clusters over a 34' × 34' field of view taken with the Wide Field Cameras on the INT and the 2.2m MPG/ESO telescopes.

With the aim of covering the virial region and extending out into the infall region, we have obtained GTO OmegaCAM imaging in the u-, B- and V-bands over 1 by 1 degree for 45 fields covering 46 WINGS clusters. A large spectroscopic follow-up campaign targeting these clusters was carried out with AAOmega on the AAT (Moretti et al. 2017 ). We named this extension of the WINGS survey, OmegaWINGS.

selected publications:

OmegaWINGS: OmegaCAM-VST observations of WINGS galaxy clusters
OmegaWINGS: A VST Survey of Nearby Galaxy Clusters
OmegaWINGS: spectroscopy in the outskirts of local clusters of galaxies
OmegaWINGS: The First Complete Census of Post-starburst Galaxies in Clusters in the Local Universe
The concentration-mass relation of clusters of galaxies from the OmegaWINGS survey
1 by 1 degree V-band OmegaCAM image of cluster A2399. The FoV of WINGS imaging obtained with WFI is shown for comparison (grey square). The circle shows the radius (R200) of the cluster. The colour images zooming into three selected areas were obtained by combining OmegaWINGS u-,B-, and V-band images. From Gullieuszik at al (2017).


GASP (GAs Stripping Phenomena in galaxies with MUSE) is an ESO Large Program carried out with the MUSE Integral Field spectrograph on the VLT to observe 100 stripping candidates at z=0.04-0.07 located in different environments (from the field to clusters).

This program started in October 2015 and has been allocated 120 hours of MUSE over four semesters. GASP targets are galaxies over a wide range of galaxy masses, degrees of morphological asymmetry and environments.

The aim of this program is to clarify how, where and why the gas removal occurs, measure its timescale and efficiency as a function of galaxy mass and environment, and quantify the amount of star formation involved in this process. Existing auxiliary data and planned campaigns (e.g. APEX CO1-0, VLA, ALMA, Astrosat) allow to characterize all the phases of the gas and stellar populations.

selected publications:

GASP. I. Gas Stripping Phenomena in Galaxies with MUSE
GASP. IV. A Muse View of Extreme Ram-pressure-stripping in the Plane of the Sky: The Case of Jellyfish Galaxy JO204
Ram-pressure feeding of supermassive black holes
GASP IX. Jellyfish galaxies in phase-space: an orbital study of intense ram-pressure stripping in clusters
GASP. V. Ram-pressure stripping of a ring Hoag's-like galaxy in a massive cluster
The first 100 GASP galaxies observed with MUSE at the VLT. the RGB images are obtained by combining the g-, r-, and i-band images obtained from the MUSE datacubes.

Hα and RGB images obtained from MUSE observations for a sample of GASP target galaxies. Click on the images to switch between RGB and Hα images.

Science cases for ELTs

To explore the possibilities that will be offered by forthcoming Extremely Large Telescopes (ELTs) like the E-ELT or the TMT I started to work with simulated obsarvations of resolved and unresolved stellar populations.

The simulations were carried out by adopting the parameters of MICADO, the instrument designed for the 39-m aperture E-ELT to provide quasi-diffraction limited imaging over a wide (~1') field of view, and from the phase A study of MAORY, the Multi-conjugate Adaptive Optics module for the E-ELT. For comparison with other next-generation telescopes, we carried out also simulations adoptiong the specifications for IRIS instrument at TMT and the NIRCam camera at JWST.

To evaluate the impact of the unique spatial resolution and sensitivity of ELTs in the study of both resolved and unresolved stellar populations, developed a few key science cases: (i) nearby nuclear star clusters to explore che accuracy of point-like photometry in extremely crowded stellar fields and (ii) galaxies at redshift 2-3 to assess the feasibility of accurate photometric and morphological measurements in high-redshift galaxies.

These results were included in the MAORY science cases white book

selected publications:

Probing the nuclear star cluster of galaxies with extremely large telescopes
Exploring high-z galaxies with the E-ELT
The Chandra Deep Field South as a test case for Global Multi Conjugate Adaptive Optics
MAORY science cases white book
Simulations of MICADO (central panels) and NIRCam (right panels) J- and H-band observations of galaxies at z ~ 2 obtained using HST observations of nearby galaxies as templates (left panels). From Gullieuszik at al (2016).


2002 Master thesis degree at the Padova University
Thesis title: "Wide field photometry of four Galactic Globular Clusters",
Supervisor: G. Piotto
Marks: 110/110
2007 PhD in Astronomy at the Padova University.
Thesis title: "Evolved stellar populations in Local Group dwarf galaxies"
Supervisors: E. V. Held and S. Ortolani


01.2003 - 06.2006 Assegno di ricerca at INAF - Osservatorio di Padova
06.2007 - 02.2010 Assegno di ricerca at INAF - Osservatorio di Padova
03.2010 - 12.2011 Associate Researcher at the Royal Observatory of Belgium, Brussels
04.2012 - now Assegno di ricerca at INAF - Osservatorio di Padova


09.2005 - 12.2005 Unpaid Associate at ESO, Santiago de Chile
02.2006 - 04.2006 Unpaid Associate at ESO, Garching bei München - Germany
03.2007 - 05.2007 Unpaid Associate at ESO, Garching bei München - Germany
05.2008 Unpaid Associate at ESO, Garching bei München - Germany