Discovery of High Frequency Quasi-Periodic Oscillations in 4u1915-05
| dc.creator | Barret, D. | |
| dc.creator | Boirin, L. | |
| dc.creator | Olive, J. F. | |
| dc.creator | Grindlay, J. E. | |
| dc.creator | Bloser, P. F. | |
| dc.creator | Swank, J. | |
| dc.creator | Smale, A. P. | |
| dc.date | 1998-11-15 | |
| dc.date.accessioned | 2026-07-07T02:29:07Z | |
| dc.date.available | 2026-07-07T02:29:07Z | |
| dc.description | The type I X-ray burster and dipper 4U1915-05 (also known as XB1916-053) was monitored by the Rossi X-ray Timing Explorer between February and October, 1996. The source was observed in various spectral states; the highest luminosity state (LX ~ 1.5 10^37 ergs/s, 10 kpc, 1-20 keV) is associated with a soft spectrum, whereas for the lower luminosity state (down to ~5 10^36 ergs/s) the spectrum is significantly harder. Using the high time resolution data provided by the Proportional Counter Array (PCA), we have discovered High-Frequency Quasi-Periodic Oscillations (HFQPOs) in the persistent X-ray emission of 4U1915-05 while its luminosity was ~8 10^36 ergs/s. The QPO frequency ranges from 600 Hz up to ~1000 Hz, with typical Full Width at Half Maximum (FWHM) ~50-100 Hz and Root Mean Squared (RMS) values 15%. In addition, by using the ``shift and add'' technique, we have detected a twin HFQPO (5.5 sigma level) separated from the main peak by ~355 Hz. 4U1915-05 is the eighth Atoll source displaying simultaneous twin HFQPOs. Based on current knowledge of HFQPO sources, our observations suggest that 4U1915-05 might contain a 2.8 (or 5.6) millisecond rotating neutron star. | |
| dc.description | Paper presented at the Third INTEGRAL Workshop (The Extreme Universe, September 14-18th, 1998, Taormina, Italy). Accepted for publication in Astrophysical Letters and Communications: 7 pages,1 table and 4 figures | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9811236 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9811236 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/13344 | |
| dc.subject | Astrophysics | |
| dc.title | Discovery of High Frequency Quasi-Periodic Oscillations in 4u1915-05 | |
| dc.type | text |