GIULIA GIANFAGNA

Dottoressa di ricerca

ciclo: XXXVI


co-supervisore: Luigi Piro

Titolo della tesi: Binary Neutron Star mergers in the multi-messenger era: from astrophysics to cosmology

In August 2017, the groundbreaking observation of GW170817 marked the first-ever identification of a binary neutron star merger, accompanied by the detection of a Gravitational Wave (GW) and a gamma-ray burst (GRB). The GRB exhibited prompt gamma-ray emission and an afterglow across radio, optical, and X-ray bands, originating from a relativistic jet formed post-merger at an angle of 20-30 degrees from its axis. This PhD thesis joins the GW and afterglow datasets of GW170817 through simultaneous fitting using Bayesian statistics. The key parameters shared between the two models, namely the inclination of the binary system (or viewing angle) and the luminosity distance, facilitate this joint analysis. The afterglow dataset includes a broadband light curve and the motion of the relativistic jet centroid over time. The thesis delves into significant challenges in both astrophysics and cosmology. In astrophysics, the investigation focuses on understanding the angular structure and energetics of the jet, influenced by its opening angle. The analysis of the GW and afterglow light curves reveals a jet opening angle and energetics consistent with population studies. Considering the jet centroid motion results instead in higher energetics compared to population studies. The jet's structure is discerned through the early rising phase of the afterglow, indicating a structured jet with an energetic core and less energetic wings. In the realm of cosmology, GWs emerge as a potent tool. The GW luminosity distance enables an independent estimation of the Hubble constant (H0), crucial for addressing the Hubble tension. While a sole GW fit lacks the precision required for H0, incorporating the afterglow light curve and centroid motion improves precision threefold. However, this precision has not yet reached the level of other cosmological H0 estimations but may do so in the future. Additionally, the thesis explores future perspectives on new binary neutron star events.

Produzione scientifica

11573/1701237 - 2024 - Potential biases and prospects for the Hubble constant estimation via electromagnetic and gravitational-wave joint analyses
Gianfagna, Giulia; Piro, Luigi; Pannarale, Francesco; Van Eerten, Hendrik; Ricci, Fulvio; Ryan, Geoffrey - 01a Articolo in rivista
rivista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (Blackwell Science Limited:PO Box 88, Oxford OX2 0NE United Kingdom:011 44 1865 776868, 011 44 1865 206038, EMAIL: journals.cs@blacksci.co.uk, INTERNET: http://www.blackwell-science.com, Fax: 011 44 1865 721205) pp. 2600-2613 - issn: 0035-8711 - wos: WOS:001156520800021 (1) - scopus: 2-s2.0-85184354989 (2)

11573/1683765 - 2023 - The three hundred project. A machine learning method to infer clusters of galaxy mass radial profiles from mock Sunyaev–Zel’dovich maps
Ferragamo, A.; De Andres, D.; Sbriglio, A.; Cui, W.; De Petris, M.; Yepes, G.; Dupuis, R.; Jarraya, M.; Lahouli, I.; De Luca, F.; Gianfagna, G.; Rasia, E. - 01a Articolo in rivista
rivista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (Blackwell Science Limited:PO Box 88, Oxford OX2 0NE United Kingdom:011 44 1865 776868, 011 44 1865 206038, EMAIL: journals.cs@blacksci.co.uk, INTERNET: http://www.blackwell-science.com, Fax: 011 44 1865 721205) pp. 4000-4008 - issn: 0035-8711 - wos: WOS:001043810000016 (8) - scopus: 2-s2.0-85158880215 (7)

11573/1692523 - 2023 - Joint analysis of gravitational-wave and electromagnetic data of mergers. Breaking an afterglow model degeneracy in GW170817 and in future events
Gianfagna, Giulia; Piro, Luigi; Pannarale, Francesco; Vaneerten, Hendrik; Ricci, Fulvio; Ryan, Geoffrey; Troja, Eleonora - 01a Articolo in rivista
rivista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (Blackwell Science Limited:PO Box 88, Oxford OX2 0NE United Kingdom:011 44 1865 776868, 011 44 1865 206038, EMAIL: journals.cs@blacksci.co.uk, INTERNET: http://www.blackwell-science.com, Fax: 011 44 1865 721205) pp. 4771-4784 - issn: 0035-8711 - wos: WOS:001019516400010 (4) - scopus: 2-s2.0-85164038545 (4)

11573/1666254 - 2023 - A study of the hydrostatic mass bias dependence and evolution within the three hundred clusters
Gianfagna, Giulia; Rasia, Elena; Cui, Weiguang; De Petris, Marco; Yepes, Gustavo; Contreras-Santos, Ana; Knebe, Alexander - 01a Articolo in rivista
rivista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (Blackwell Science Limited:PO Box 88, Oxford OX2 0NE United Kingdom:011 44 1865 776868, 011 44 1865 206038, EMAIL: journals.cs@blacksci.co.uk, INTERNET: http://www.blackwell-science.com, Fax: 011 44 1865 721205) pp. 4238-4248 - issn: 0035-8711 - wos: WOS:001051195600047 (7) - scopus: 2-s2.0-85144994563 (17)

11573/1651753 - 2022 - The Three Hundred Project: the gizmo-simba run
Cui, W.; Dave, R.; Knebe, A.; Rasia, E.; Gray, M.; Pearce, F.; Power, C.; Yepes, G.; Anbajagane, D.; Ceverino, D.; Contreras-Santos, A.; De Andres, D.; De Petris, M.; Ettori, S.; Haggar, R.; Li, Q.; Wang, Y.; Yang, X.; Borgani, S.; Dolag, K.; Zu, Y.; Kuchner, U.; Canas, R.; Ferragamo, A.; Gianfagna, G. - 01a Articolo in rivista
rivista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (Blackwell Science Limited:PO Box 88, Oxford OX2 0NE United Kingdom:011 44 1865 776868, 011 44 1865 206038, EMAIL: journals.cs@blacksci.co.uk, INTERNET: http://www.blackwell-science.com, Fax: 011 44 1865 721205) pp. 977-996 - issn: 0035-8711 - wos: WOS:000808232500012 (49) - scopus: 2-s2.0-85133612618 (46)

11573/1657950 - 2022 - A deep learning approach to infer galaxy cluster masses from Planck Compton-y parameter maps
De Andres, D.; Cui, W.; Ruppin, F.; De Petris, M.; Yepes, G.; Gianfagna, G.; Lahouli, I.; Aversano, G.; Dupuis, R.; Jarraya, M.; Vega-Ferrero, J. - 01a Articolo in rivista
rivista: NATURE ASTRONOMY ([London] : Macmillan Publishers Ltd, part of Springer Nature) pp. - - issn: 2397-3366 - wos: WOS:000869343600001 (15) - scopus: 2-s2.0-85140037706 (16)

11573/1604952 - 2022 - The hydrostatic mass bias in THE THREE HUNDRED clusters
Gianfagna, Giulia; Rasia, Elena; Cui, Weiguang; De Petris, Marco; Gustavo Yepes, And - 04c Atto di convegno in rivista
rivista: EPJ WEB OF CONFERENCES (Les Ulis : EDP Sciences, 2009-) pp. - - issn: 2101-6275 - wos: (0) - scopus: (0)
congresso: mm Universe @ NIKA2 - Observing the mm Universe with the NIKA2 camera (Rome)

11573/1604967 - 2022 - The Three Hundred–NIKA2 Sunyaev–Zeldovich Large Program twin samples: Synthetic clusters to support real observations
Paliwal, A.; Artis, E.; Cui, W.; De Petris, M.; Désert, F. -X.; Ferragamo, A.; Gianfagna, G.; Kéruzoré, F.; Macías-Pérez, J. -F.; Mayet, F.; Muñoz-Echeverría, M.; Perotto, L.; Rasia, E.; Ruppin, F.; Yepes, G. - 04c Atto di convegno in rivista
rivista: EPJ WEB OF CONFERENCES (Les Ulis : EDP Sciences, 2009-) pp. - - issn: 2101-6275 - wos: (0) - scopus: (0)
congresso: mm Universe @ NIKA2 - Observing the mm Universe with the NIKA2 camera (Rome)

11573/1561011 - 2021 - Exploring the hydrostatic mass bias in MUSIC clusters: Application to the NIKA2 mock sample
Gianfagna, G.; De Petris, M.; Yepes, G.; De Luca, F.; Sembolini, F.; Cui, W.; Biffi, V.; Keruzore, F.; Macias-Perez, J.; Mayet, F.; Perotto, L.; Rasia, E.; Ruppin, F. - 01a Articolo in rivista
rivista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (Blackwell Science Limited:PO Box 88, Oxford OX2 0NE United Kingdom:011 44 1865 776868, 011 44 1865 206038, EMAIL: journals.cs@blacksci.co.uk, INTERNET: http://www.blackwell-science.com, Fax: 011 44 1865 721205) pp. 5115-5133 - issn: 0035-8711 - wos: WOS:000637320100030 (42) - scopus: 2-s2.0-85105210277 (49)

11573/1399278 - 2020 - Confirmation of NIKA2 investigation of the sunyaev-zel’dovich effect by using synthetic clusters of galaxies
De Petris, Marco; Ruppin, Florian; Sembolini, Federico; Adam, Remí; Baldi, Anna Silvia; Cialone, Giammarco; Comis, Barbara; De Luca, Federico; Gianfagna, Giulia; Kéruzoré, Florian; Macías-Pérez, Juan; Mayet, Frédéric; Perotto, Laurence; Yepes, Gustavo - 04b Atto di convegno in volume
congresso: mm Universe @ NIKA2 - Observing the mm Universe with the NIKA2 Camera (Grenoble, France)
libro: mm Universe @ NIKA2 - Observing the mm Universe with the NIKA2 Camera - ()

© Università degli Studi di Roma "La Sapienza" - Piazzale Aldo Moro 5, 00185 Roma