| Title: |
Beyond Accretion Limits: The Rise of Pulsating Gems. |
| Authors: |
Israel, Gian Luca1 (AUTHOR) gianluca.israel@inaf.it, Amato, Roberta1 (AUTHOR), Imbrogno, Matteo1,2 (AUTHOR), Pinciroli Vago, Nicoló Oreste1,3 (AUTHOR) nicolooreste.pinciroli@polimi.it, Rodríguez Castillo, Guillermo Andres (AUTHOR), Belfiore, Andrea (AUTHOR), Stella, Luigi (AUTHOR), Bachetti, Matteo (AUTHOR), Fürst, Felix (AUTHOR), Walton, Dom (AUTHOR), Middleton, Matthew (AUTHOR), Brightman, Murray (AUTHOR), Pintore, Fabio (AUTHOR), Pinto, Ciro (AUTHOR), Conforti, Silvia (AUTHOR), Zampieri, Luca (AUTHOR), Salvaggio, Chiara (AUTHOR), Wolter, Anna (AUTHOR), Tiengo, Andrea (AUTHOR), De Luca, Andrea (AUTHOR) |
| Source: |
Astronomische Nachrichten. Jan2025, Vol. 346 Issue 1, p1-8. 8p. |
| Abstract: |
The discovery of several ultraluminous X‐ray sources exhibiting fast and rapidly evolving X‐ray pulsations unequivocally associates these sources with accreting neutron stars orbiting relatively massive companion stars (> 8M ⊙$$ {}_{\odot } $$). Among these ULXs, the brightest pulsating ULX (PULX), NGC 5907 ULX‐1, displays a peak luminosity (~2 × 1041 erg s−1) that exceeds its Eddington limit by ~1000 times. These discoveries have raised several key questions, the most urgent of which include: what physical process (or processes) is driving the observed luminosities? What is the nature of compact objects in the still non‐pulsating ULXs, and how can we unambiguously ascertain it? Why are PULXs so rare and elusive, and how can we identify more members of this class? In this contribution, a brief overview of the ULX class is provided focusing on PULXs, presenting the most recent results obtained for NGC 5907 ULX‐1, NGC 7793 P13, M82 X‐2 and M51 ULX‐7. How current‐generation X‐ray missions are already providing (and can continue to do so in the next years) a wealth of information to address the aforementioned questions is also outlined. [ABSTRACT FROM AUTHOR] |
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