Milky-Way-like stars in a galaxy core 8 billion years ago revealed by gravitational lensing
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
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2026
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| author | D'Amato, Quirino Mannucci, Filippo Sonnenfeld, Alessandro Scialpi, Martina Nightingale, James W. Spingola, Cristiana Zibetti, Stefano Marconi, Alessandro Rosati, Piero Marconcini, Cosimo Agapito, Guido Gallazzi, Anna Di Teodoro, Enrico Andreuzzi, Gloria Belfiore, Francesco Bertola, Elena Bracci, Caterina Carniani, Stefano Cataldi, Elisa Chakraborty, Avinanda Ceci, Matteo Cicone, Claudia Ciurlo, Anna Cresci, Giovanni De Rosa, Alessandra Di Carlo, Elisa Feltre, Anna Ginolfi, Michele Lamperti, Isabella Moreschini, Bianca Nardini, Emanuele Perna, Michele Portaluri, Elisa Rubinur, Khatun Saracco, Paolo Severgnini, Paola Testa, Vincenzo Tozzi, Giulia Venturi, Giacomo Ulivi, Lorenzo Vignali, Cristian Zanchettin, Maria Vittoria Pepe, Antonio |
| author_facet | D'Amato, Quirino Mannucci, Filippo Sonnenfeld, Alessandro Scialpi, Martina Nightingale, James W. Spingola, Cristiana Zibetti, Stefano Marconi, Alessandro Rosati, Piero Marconcini, Cosimo Agapito, Guido Gallazzi, Anna Di Teodoro, Enrico Andreuzzi, Gloria Belfiore, Francesco Bertola, Elena Bracci, Caterina Carniani, Stefano Cataldi, Elisa Chakraborty, Avinanda Ceci, Matteo Cicone, Claudia Ciurlo, Anna Cresci, Giovanni De Rosa, Alessandra Di Carlo, Elisa Feltre, Anna Ginolfi, Michele Lamperti, Isabella Moreschini, Bianca Nardini, Emanuele Perna, Michele Portaluri, Elisa Rubinur, Khatun Saracco, Paolo Severgnini, Paola Testa, Vincenzo Tozzi, Giulia Venturi, Giacomo Ulivi, Lorenzo Vignali, Cristian Zanchettin, Maria Vittoria Pepe, Antonio |
| contents | The assembly of stellar-dominated cores in elliptical galaxies is key to understanding how cosmic structures evolved. Gravitational lensing offers unique insights into the nature of their stars. We report the discovery of the smallest known quadruply lensed quasar (radius ~0.2"), whose lensing galaxy at redshift 1.055 (5.5 billion years after the Big Bang) features a lensing mass of only ~2x10^10 M_sun. A Bayesian analysis, based on the system's exceptional properties and standard scaling relations, allowed us to sample the central galactic initial mass function with unmatched accuracy and in a previously uncharted regime in terms of mass and redshift. We found it consistent with the Milky Way one, while excluding bottom-heavy functions. This suggests that the core either grew slowly or underwent early disruptive events altering its stellar build-up, in contrast with the classical view that bulges form rapidly and remain unchanged by later interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_01828 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Milky-Way-like stars in a galaxy core 8 billion years ago revealed by gravitational lensing D'Amato, Quirino Mannucci, Filippo Sonnenfeld, Alessandro Scialpi, Martina Nightingale, James W. Spingola, Cristiana Zibetti, Stefano Marconi, Alessandro Rosati, Piero Marconcini, Cosimo Agapito, Guido Gallazzi, Anna Di Teodoro, Enrico Andreuzzi, Gloria Belfiore, Francesco Bertola, Elena Bracci, Caterina Carniani, Stefano Cataldi, Elisa Chakraborty, Avinanda Ceci, Matteo Cicone, Claudia Ciurlo, Anna Cresci, Giovanni De Rosa, Alessandra Di Carlo, Elisa Feltre, Anna Ginolfi, Michele Lamperti, Isabella Moreschini, Bianca Nardini, Emanuele Perna, Michele Portaluri, Elisa Rubinur, Khatun Saracco, Paolo Severgnini, Paola Testa, Vincenzo Tozzi, Giulia Venturi, Giacomo Ulivi, Lorenzo Vignali, Cristian Zanchettin, Maria Vittoria Pepe, Antonio Astrophysics of Galaxies The assembly of stellar-dominated cores in elliptical galaxies is key to understanding how cosmic structures evolved. Gravitational lensing offers unique insights into the nature of their stars. We report the discovery of the smallest known quadruply lensed quasar (radius ~0.2"), whose lensing galaxy at redshift 1.055 (5.5 billion years after the Big Bang) features a lensing mass of only ~2x10^10 M_sun. A Bayesian analysis, based on the system's exceptional properties and standard scaling relations, allowed us to sample the central galactic initial mass function with unmatched accuracy and in a previously uncharted regime in terms of mass and redshift. We found it consistent with the Milky Way one, while excluding bottom-heavy functions. This suggests that the core either grew slowly or underwent early disruptive events altering its stellar build-up, in contrast with the classical view that bulges form rapidly and remain unchanged by later interactions. |
| title | Milky-Way-like stars in a galaxy core 8 billion years ago revealed by gravitational lensing |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2604.01828 |