2006/08/22 by E. V. Gotthelf, J. P. Halpern · 6 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysical Phenomena and Observations #Black-body radiation #Constant (computer programming) #Cosmology #Earth Systems and Cosmic Evolution #Luminosity #Pulsar #Pulsars and Gravitational Waves Research #Spectral analysis #Spectral line #Transient (computer programming) #X-ray pulsar #astro-ph
paper · pdf · doi:10.1007/s10509-007-9327-9
published as Astrophys.SpaceSci.308:79-87,2007 · 8 pages, 7 figures, 1 table, latex. To appear in the proceedings of "Isolated Neutron Stars", Astrophysics & Space Science, in press
arxiv created 2006/08/22 · openalex publication_date 2007/03/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present the latest results from a multi-epoch timing and spectral study of the Transient Anomalous X-ray Pulsar XTE J1810-197. We have acquired seven observations of this pulsar with the Newton X-ray Multi-mirror Mission (XMM-Newton) over the course of two and a half years, to follow the spectral evolution as the source fades from outburst. The spectrum is arguably best characterized by a two-temperature blackbody whose luminosities are decreasing exponentially with tau1 = 870 days and tau2 = 280 days, respectively. The temperatures of these components are currently cooling at a rate of 22% per year from a nearly constant value recorded at earlier epochs of kT1 = 0.25 keV and kT2 = 0.67 keV, respectively. The new data show that the temperature T1 and luminosity of that component have nearly returned to their historic quiescent levels and that its pulsed fraction, which has steadily decreased with time, is now consistent with the previous lack of detected pulsations in quiescence. We also summarize the detections of radio emission from XTE J1810-197, the first confirmed for any AXP. We consider possible models for the emission geometry and mechanisms of XTE J1810-197.