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Imaging X-ray, Optical, and Infrared Observations of the Transient Anomalous X-ray Pulsar
| Content Provider | Semantic Scholar |
|---|---|
| Copyright Year | 2008 |
| Abstract | We report X-ray imaging, timing, and spectral studies of XTE J1810−197, a 5.54 s pulsar discovered by Ibrahim et al. (2003) in recent RXTE observations. In a short exposure with the High Resolution Camera on-board the Chandra X-ray Observatory we detect one source at (J2000) 180951.13, −194351. 7 with a 1σ uncertainty radius of 2. 5. Its flux is strongly modulated (57.6% pulsed fraction) at the expected period. Spectra obtained with Newton X-Ray Multi-Mirror Mission (XMM) are well fitted by a twocomponent model that typically describes anomalous X-ray pulsars (AXPs), an absorbed blackbody plus power law with parameters kT = 0.67 ± 0.01 keV, Γ = 3.7 ± 0.2, NH = (1.05 ± 0.05) × 10 cm, and Fx(0.5 − 10 keV) = 3.98 × 10 ergs cm s. Alternatively, a two-temperature blackbody fit is just as acceptable. The location of CXOU J180951.1−194351 is consistent with a point source seen in archival Einstein, ROSAT , and ASCA images, when its flux was nearly two orders-of-magnitude fainter, and from which no pulsations are found. The spectrum changed dramatically between the “quiescent” and “active” states, the former can be modeled as a softer blackbody. Using XMM -Newton timing data, we place an upper limit of 0.03 lt-s on any orbital motion in the period range 10 min – 8 hr. Optical and infrared images obtained on the SMARTS 1.3 m telescope at CTIO show no object in the Chandra error circle to limits V = 22.5, I = 21.3, J = 18.9, and K = 17.5. Together, these results argue that CXOU J180951.1−194351 is an isolated neutron star, one most similar to the transient AXP AX J1844.8−0256. Continuing study of XTE J1810−197 in various states of luminosity is important for understanding and possibly unifying a growing class of isolated, young neutron stars that are not powered by rotation. Subject headings: stars: individual (CXOU J180951.1−194351, XTE J1810−197) — stars: neutron — X-rays: stars |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0309745v1.pdf |
| Alternate Webpage(s) | https://www.researchgate.net/profile/Michelle_Buxton/publication/1809162_Imaging_XRay_Optical_and_Infrared_Observations_of_the_Transient_Anomalous_XRay_Pulsar_XTE_J1810197/links/00b7d524c492fac59f000000.pdf |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0309745v2.pdf |
| Alternate Webpage(s) | http://cds.cern.ch/record/645405/files/0309745.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | ANOVA–simultaneous component analysis Amoxicillin Diagnostic radiologic examination GUCY2C protein, human Genus Asca Kiloelectronvolt Maxima and minima Medical Subject Headings Microsoft Dynamics AX Modulation Molecular orbital NetHack Neutrons Newton On-board data handling Power (Psychology) RCA Spectra 70 Radiography Rajiformes Seizures Smiles Arbitrary Target Specification Stars, Celestial orders - HL7PublishingDomain |
| Content Type | Text |
| Resource Type | Article |
