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An Accurate Determination of the Optical Periodic Modulation in the X-Ray Binary SAX J1808.4-3658
Zhongxiang Wang, Cees Bassa, Andrew Cumming +1
We report on optical imaging of the X-ray binary SAX J1808.4-3658 with the 8-m Gemini South Telescope. The binary, containing an accretion-powered millisecond pulsar, appears to ha…
RXTE Monitoring of the Anomalous X-ray Pulsar 1E 1048.1-5937: Long-Term Variability and the 2007 March Event
Rim Dib, Victoria M. Kaspi, Fotis P. Gavriil
After three years of no unusual activity, Anomalous X-ray Pulsar 1E 1048.1-5937 reactivated in 2007 March. We report on the detection of a large glitch (Delta(nu)/nu =1.63(2)X~10^{…
PSR J1856+0245: Arecibo Discovery of a Young, Energetic Pulsar Coincident with the TeV Gamma-ray Source HESS J1857+026
J. W. T. Hessels, D. J. Nice, B. M. Gaensler +21
We present the discovery of the Vela-like radio pulsar J1856+0245 in the Arecibo PALFA survey. PSR J1856+0245 has a spin period of 81ms, a characteristic age of 21kyr, and a spin-d…
An Eccentric Binary Millisecond Pulsar in the Galactic Plane
D. J. Champion, S. M. Ransom, P. Lazarus +28
Binary pulsar systems are superb probes of stellar and binary evolution and the physics of extreme environments. In a survey with the Arecibo telescope, we have found PSR J1903+032…
No detectable radio emission from the magnetar-like pulsar in Kes 75
Anne M. Archibald, Victoria M. Kaspi, Margaret A. Livingstone +1
The rotation-powered pulsar PSR J1846-0258 in the supernova remnant Kes 75 was recently shown to have exhibited magnetar-like X-ray bursts in mid-2006. Radio emission has not yet b…
Detailed high-energy characteristics of AXP 4U 0142+61 - Multi-year observations with INTEGRAL, RXTE, XMM-Newton and ASCA
P. R. den Hartog, L. Kuiper, W. Hermsen +4
We present detailed spectral and temporal characteristics both in the hard X-ray (>10 keV) and soft X-ray (<10 keV) domains, obtained using data from INTEGRAL, XMM-Newton, ASCA and…
Magnetar-like Emission from the Young Pulsar in Kes 75
F. P. Gavriil, M. E. Gonzalez, E. V. Gotthelf +3
We report detection of magnetar-like X-ray bursts from the young pulsar PSR J1846-0258, at the center of the supernova remnant Kes 75. This pulsar, long thought to be rotation-powe…
Activity from Magnetar Candidate 4U 0142+61: Bursts and Emission Lines
Fotis P. Gavriil, Rim. Dib, Victoria M. Kaspi
After 6 years of quiescence, Anomalous X-ray Pulsar (AXP) 4U 0142+61 entered an active phase in 2006 March that lasted several months. During the active phase, several bursts were…
Red Noise in Anomalous X-ray Pulsar Timing Residuals
Anne M. Archibald, Rim Dib, Margaret A. Livingstone +1
Anomalous X-ray Pulsars (AXPs), thought to be magnetars, exhibit poorly understood deviations from a simple spin-down called "timing noise". AXP timing noise has strong low-frequen…
The Variable X-ray and Near-IR Behavior of the Particularly Anomaloux X-ray Pulsar 1E 1048.1-5937
Cindy R. Tam, Fotis P. Gavriil, Rim Dib +3
We present the results of X-ray and near-IR observations of the anomalous X-ray pulsar 1E 1048.1-5937, believed to be a magnetar. This AXP underwent a period of extreme variability…
Optical/Infrared Observations of the Anomalous X-ray Pulsar 1E 1048.1-5937 During Its 2007 X-Ray Flare
Z. Wang, C. Bassa, V. M. Kaspi +2
We report on optical and infrared observations of the anomalous X-ray pulsar (AXP) 1E 1048.1-5937, made during its ongoing X-ray flare which started in 2007 March. We detected the…
Search for Mid-IR Flux Variations from The Anomalous X-ray Pulsar 4U 0142+61
Z. Wang, V. M. Kaspi
We report on our Spitzer observations of the anomalous X-ray pulsar 4U 0142+61, made following a large X-ray burst that occurred on 2007 February 7. To search for mid-infrared flux…
The GBT350 Survey of the Northern Galactic Plane for Radio Pulsars and Transients
J. W. T. Hessels, S. M. Ransom, V. M. Kaspi +3
Using the Green Bank Telescope (GBT) and Pulsar Spigot at 350MHz, we have surveyed the Northern Galactic Plane for pulsars and radio transients. This survey covers roughly 1000 squ…
The Long-term Radiative Evolution of Anomalous X-ray Pulsar 1E 2259+586 after its 2002 Outburst
Weiwei Zhu, Victoria M. Kaspi, Peter M. Woods +3
We present an analysis of five X-ray Multi-Mirror Mission (XMM) observations of the anomalous X-ray pulsar (AXP) 1E 2259+586 taken in 2004 and 2005 during its relaxation following…
Long-term X-ray changes in the emission from the anomalous X-ray pulsar 4U 0142+61
M. E. Gonzalez, R. Dib, V. M. Kaspi +3
We present results obtained from X-ray observations of the anomalous X-ray pulsar (AXP) 4U 0142+61 taken between 2000-2007 using XMM-Newton, Chandra and Swift. In observations take…
A 1.4-GHz Arecibo Survey for Pulsars in Globular Clusters
J. W. T. Hessels, S. M. Ransom, I. H. Stairs +2
We have surveyed all 22 known Galactic globular clusters observable with the Arecibo radio telescope and within 70kpc of the Sun for radio pulsations at ~1.4GHz. Data were taken wi…
X-ray and Near-IR Variability of the Anomalous X-ray Pulsar 1E 1048.1-5937: From Quiescence Back to Activity
Cindy R. Tam, Fotis P. Gavriil, Rim Dib +3
(Abridged) We report on new and archival X-ray and near-infrared observations of the anomalous X-ray pulsar 1E 1048.1-5937 performed between 2001-2007 with RXTE, CXO, Swift, HST, a…
Glitches in Anomalous X-ray Pulsars
Rim Dib, Victoria M. Kaspi, Fotis P. Gavriil
(Abridged) We report on 8.7 and 7.6 yr of RXTE observations of the Anomalous X-ray Pulsars (AXPs) RXS J170849.0-400910 and 1E 1841-045, respectively. These observations, part of a…
Years of RXTE Monitoring of Anomalous X-ray Pulsar 4U 0142+61: Long-Term Variability
R. Dib, V. M. Kaspi, F. P. Gavriil
We report on 10 years of monitoring of the 8.7-s Anomalous X-ray Pulsar 4U 0142+61 using the Rossi X-Ray Timing Explorer (RXTE). This pulsar exhibited stable rotation from 2000 Mar…
The Unusual Binary Pulsar PSR J1744-3922: Radio Flux Variability, Near-infrared Observation and Evolution
R. P. Breton, M. S. E. Roberts, S. M. Ransom +4
PSR J1744-3922 is a binary pulsar exhibiting highly variable pulsed radio emission. We report on a statistical multi-frequency study of the pulsed radio flux variability which sugg…
New Phase-coherent Measurements of Pulsar Braking Indices
Margaret A. Livingstone, Victoria M. Kaspi, Fotis P. Gavriil +3
Pulsar braking indices offer insight into the physics that underlies pulsar spin-down. Only five braking indices have been measured via phase-coherent timing; all measured values a…
Spitzer Mid-infrared Upper Limits on Anomalous X-Ray Pulsars 1E 1048.1-5937, 1RXS J170849-400910, and XTE J1810-197
Z. Wang, V. M. Kaspi, S. J. U. Higdon
We report on mid-infrared imaging observations of the anomalous X-ray pulsars (AXPs) 1E 1048.1-5937, 1RXS J170849-400910, and XTE J1810-197. The observations were carried out at 4.…
10 Years of RXTE Monitoring of Anomalous X-ray Pulsar 4U 0142+61: Long-Term Variability
Rim Dib, Victoria M. Kaspi, Fotis P. Gavriil
We report on 10 yr of monitoring of the 8.7-s Anomalous X-ray Pulsar 4U 0142+61 using the Rossi X-Ray Timing Explorer (RXTE). This pulsar exhibited stable rotation from 2000 until…
Chandra and XMM-Newton Observations of the Vela-like Pulsar B1046-58
M. E. Gonzalez, V. M. Kaspi, M. J. Pivovaroff +1
We present results from Chandra and XMM-Newton observations of the radio pulsar B1046-58. A high-resolution spatial analysis reveals an asymmetric pulsar wind nebula (PWN) ~6"x11"…