| PROPOSAL OVERVIEW | |
| Proposal Title | Too B or not too B: the quest for the PULX accretion |
| Proposal Category | Isolated and Binary Compact Objects & their Evolution |
| Proposal Type | LARGE PROGRAM |
| Proposal Id | 088355 |
| Number of Observations | 1 |
| Total exposure time (ks) | 399 |
| PI DETAILS | |
| PI | Prof GianLuca Israel |
| Institute | INAF |
| Country | ITALY |
| CO-INVESTIGATORS | ||
| Name | Country | |
| L. Zampieri | ITALY | |
| A. De Luca | ITALY | |
| M. Bachetti | ITALY | |
| F. Pintore | ITALY | |
| A. Belfiore | ITALY | |
| T. Roberts | UNITED KINGDOM | |
| F. Furst | SPAIN | |
| D. Walton | UNITED KINGDOM | |
| P. Esposito | ITALY | |
| F. Harrison | UNITED KINGDOM | |
| F. Haberl | GERMANY | |
| H. Earnshaw | UNITED STATES | |
| R. Turoll | ITALY | |
| C. Pinto | ITALY | |
| A. Papitto | ITALY | |
| L. Stella | ITALY | |
| C. Selvaggio | ITALY | |
| A. Tiengo | ITALY | |
| M. Middelton | UNITED KINGDOM | |
| A. MANY OTHERS | OTHER | |
| ABSTRACT | |
| Within the framework of the AO17 UNSEEN XMM Large Program, we discovered a new 2.8-s Pulsating ULX hosted in a massive binary system (Mc>8Msun) in M51 with an orbital period of 2 days and a super-orbital modulation of about 38 days. Being a persistent source (unlike all the other known PULXs) it is very well suited for deeper studies. The present proposal is two-folded: improving our understanding of the accretion phenomena onto Neutron Stars (NSs) at extreme rates and extending our knowledge of M51 ULX-7. The requested pointings, together with the archival datasets, will allow us to measure crucial orbital parameters in order to prove whether PULXs have indeed super-Eddington luminosities or are mainly beamed- emitting NSs, a long standing problem in the field. | |
| PAPERS |
| - CLASS 1: | papers that present specific XMM-Newton observations |
| - CLASS 2: | papers that refer to published XMM-Newton results with complementary observations, follow-up analysis, or theoretical analysis |
| - CLASS 3: | further deliveries which resulted from the program and which are made available to the community (e.g. source catalogues, processed images or spectra in public data base) |
| - CLASS 4: | comments and suggestions from PI |