Antonio Ragagnin photo

Antonio Ragagnin1,2

1Dipartimento di Fisica e Astronomia "Augusto Righi", Alma Mater Studiorum Università di Bologna, via Gobetti 93/2, I-40129 Bologna, Italy
2INAF - Osservatorio Astronomico, via Tiepolo 11, 34131 Trieste, Italy
antonio.ragagnin@unibo.it

I am an astrophysicist and I work as post-doc at the University of Bologna. My main interests are: numerical simulations of formation and evolution of galaxy clusters, thorugh the study of their evolution, concentration, X-ray thermal emissions, optical properties, and strong lensing effects. I am also interested in High Performance Computing (HPC), as re-engineering of gravity and hydrodynamic N-body solvers in order to run the next generation of high-resolution hydrodynamic simulations on cosmological volumes.

Collaborations: Euclid, Magneticum, OpenGadget3, HydroSims, Darkium

Resources

My Curriculum Vitae updated at September 2024, my SAO/NASA ADS Complete list of pubblications, and my ORCiD 0000-0002-8106-2742

C2PAP Web Portal: a web portal for inspecting and post processing Magneticum simulations. Check c2pap_batch.py to send batch of jobs (and its user manual here)

print_affinity.c: helps affinity set ups in HPC systems by printing hostname and CPU index for each MPI and OpenMP thread

g3read: repository of various python libraries to read and post process Gadget2/3 and HDF5 outputs

hydro_mc: a webapp to obtain sparsity and concentration paramters of haloes as in Ragagnin et al. (2020) (see also the respective python library github.com/aragagnin/hydro_mc)

In the press

A unique data center for cosmological simulations (Science Daily, 2017)

Il futuro delle galassie in scatola (Media INAF, 2015)

First author list of publications

Dianoga SIDM: Galaxy cluster self-interacting dark matter simulations (2024)
Ragagnin A., Meneghetti M., Calura F., Despali G., Dolag K., Fischer M. S., Giocoli C., Moscardini L.

Simulation view of galaxy clusters with low X-ray surface brightness (2022)
Ragagnin A., Andreon S., Puddu E.

Galaxies in the central regions of simulated galaxy clusters (2022)
Ragagnin A., Meneghetti M., Bassini L., Ragone-Figueroa C., Granato G. L., Despali G., Giocoli C., Granata G., Moscardini L., Bergamini P., Rasia E., Valentini M., Borgani S., Calura F., Dolag K., Grillo C., Mercurio A., Murante G., Natarajan P., Rosati P., Taffoni G., Tornatore L., Tortorelli L.

Satellite galaxy abundance dependency on cosmology in Magneticum simulations (2021)
Ragagnin A., Fumagalli A., Castro T., Dolag K., Saro A., Costanzi M., Bocquet S.

Cosmology dependence of halo masses and concentrations in hydrodynamic simulations (2021)
Ragagnin A., Saro A., Singh P., Dolag K.

Gadget3 on GPUs with OpenACC (2020)
Ragagnin A., Dolag K., Wagner M., Gheller C., Roffler C., Goz D., Hubber D., Arth A.

Dependency of halo concentration on mass, redshift and fossilness in Magneticum hydrodynamic simulations (2019)
Ragagnin A., Dolag K., Moscardini L., Biviano A., D'Onofrio M.

From the mass-concentration relation of haloes to GPUs and into the web: a guide on fully utilizing super computers for the largest, cosmological hydrodynamic simulations. (PhD thesis, 2018)
Ragagnin A.

A web portal for hydrodynamical, cosmological simulations (2017)
Ragagnin A., Dolag K., Biffi V., Cadolle Bel M., Hammer N. J., Krukau A., Petkova M., Steinborn D.

Exploiting the Space Filling Curve Ordering of Particles in the Neighbour Search of Gadget3 (2016)
Ragagnin A., Tchipev N., Bader M., Dolag K., Hammer N. J.

Talks, posters and workshops

A lens on globular cluster nurseries (Sexten, 2024) talk on SIEGE simulations

Euclid Cluster of Galaxies SWG meeting (Innsbruck, 2024) talk on my first author Euclid paper "The impact of line-of-sight projections on the covariance between galaxy cluster multi-wavelength observable properties - insights from hydrodynamic simulations"

Nature of DM on small scales monthly seminar (online, hosted by Priya Natarajan) talk "Feedback and resolution do not improve the low lensing signal of simulated cluster cores"

Euclid Collaboration Cluster of Galaxies SWG talk on my Euclid first author paper

Self-interacting dark matter meeting (Pollica, 2023) talk Velocity dependent SIDM effects on galaxy cluster strong-lensing signals

Euclid Consortium meeting on galaxy clusters (Bologna, 2023) talk "A simulation view on covariances between multi wavelength observational properties"

Seminar at INAF Bologna (2023) "Strong-lensed galaxies in simulated and observed galaxy clusters"

CLUSTER3 (Bologna, 2022) talk "Galaxies in the central regions of simulated galaxy clusters"

RAS National Astronomy Meeting (NAM, University of Warwick, UK, 2022) invited talk "Galaxies in the central regions of simulated galaxy clusters"

Cosmology from Home (2022) talk "Galaxies in the central regions of simulated galaxy clusters"

CSC and NVIDIA virtual hackaton (2020) with code Gadget3 (link)

OpenACC Summit (virtual, 2020) invited talk "Bringing Zoom-In Initial Conditions of Cosmological Simulations on GPUs "

ParCo (Prague, 2019) presenting paper "Gadget3 on GPUs with OpenACC"

GPU Technology Conference (GTC, Munich, 2018) invited poster "Gadget3 (N-Body gravity + SPH) on GPUs"

EnviroInfo (Munich, 2018) invited poster "A web portal for large cosmological simulation data visualization and post processing"

EuroHack (Lugano, 2017) workshop on OpenACC at CSCS

Perspectives of GPU in science (Rome, 2016) poster "A multi node Barnes Hut solver on GPUs for Gadget3"

HydroSim (Trieste, 2016) workshop on hydrodynamic simulations

Astronomical Data Analysis Software and Systems (ADASS, Trieste, 2016) talk "A web interface to federalize the outcome of large, cosmological, hydrodynamic simulations"

EuroHack (Lugano, 2015) workshop on OpenACC at CSCS

International Conference on Parallel Computing (ParCo, Edinburgh, 2015) talk "Exploiting the Space Filling Curve Ordering of Particles in the Neighbour Search of Gadget3"

Computational Solar and Astrophysical Modeling (Jülich, 2015) workshop