| PROPOSAL OVERVIEW | |
| Proposal Title | Determining the Nature of the Extreme Off-States in ULX Pulsars with NGC5907 ULX |
| Proposal Category | White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, ULXs and Black Holes |
| Proposal Type | LARGE PROGRAM |
| Proposal Id | 082432 |
| Number of Observations | 1 |
| Total exposure time (ks) | 378 |
| PI DETAILS | |
| PI | Dr Dominc Walton |
| Institute | Institute of Astronomy |
| Country | UNITED KINGDOM |
| CO-INVESTIGATORS | ||
| Name | Country | |
| F. Fuerst | SPAIN | |
| F. Harrson | UNITED STATES | |
| A. Belfiore | ITALY | |
| G. Israel | ITALY | |
| M. Bachetti | ITALY | |
| M. Heida | UNITED STATES | |
| M. Brightman | UNITED STATES | |
| G. Rodriguez | ITALY | |
| N. Webb | FRANCE | |
| A. Fabian | UNITED KINGDOM | |
| R. Salvaterra | ITALY | |
| D. Barret | FRANCE | |
| M. Middleton | UNITED KINGDOM | |
| A. Ptak | UNITED STATES | |
| V. Rana | UNITED STATES | |
| A. De Luca | ITALY | |
| ABSTRACT | |
| We now know that some of the most luminous members of the ultraluminous X-ray source (ULX) population are actually powered by highly super-Eddington pulsars, making them the most extreme accretors known. Three such systems are now known: M82 X-2, NGC 7793 P13, and NGC 5907 ULX. These sources all exhibit unusual `off'-states in which their X-ray flux drops by ~2 orders of magnitude (or more). These off-states are fairly rare, but recent monitoring with Swift shows that NGC 5907 ULX is now entering one. Here we propose an ambitious series of six 60 ks observations of NGC 5907 ULX (360 ks in total) designed to determine the nature of these events. This is of critical importance, as these off-states may offer a means to determine the magnetic fields of these systems. | |
| 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 |
| CLASS 1 (1 references) |
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