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The discovery of a second luminous low mass x-ray binary system in the globular cluster m15
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Angelini, Lorella White, Nicholas E. |
| Copyright Year | 2001 |
| Description | Using the Chandra X-ray Observatory we have discovered a second bright X-ray source in the globular cluster M15 that is 2.7" to the west of AC211, the previously known low mass X-ray binary (LMXB) in this system. Prior to the 0.5" imaging capability of Chandra this second source could not have been resolved from AC211. The luminosity and spectrum of this new source, which we call M15-X2, are consistent with it also being a LMXB system. This is the first time that two LMXBs have been seen to be simultaneously active in a globular cluster. The new source, M15-X2, is coincident with a 18th U magnitude very blue star. The discovery of a second LMXB in M15 clears up a long standing puzzle where the X-ray and optical properties of AC211 appear consistent with the central source being hidden behind an accretion disk corona, and yet also showed a luminous X-ray burst suggesting the neutron star is directly visible. This discovery suggests instead that the X-ray burst did not come from AC211, but rather from the newly discovered X-ray source. We discuss the implications of this discovery for X-ray observations of globular clusters in nearby galaxies. |
| File Size | 565512 |
| Page Count | 15 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20010084309 |
| Archival Resource Key | ark:/13960/t3cz85g8x |
| Language | English |
| Publisher Date | 2001-01-21 |
| Access Restriction | Open |
| Subject Keyword | Astronomy Mass Coronas Image Resolution Neutron Stars X Ray Binaries Optical Properties Luminosity Blue Stars X Ray Astrophysics Facility Globular Clusters Accretion Disks X Ray Sources Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
