Spitzer Mid-infrared Upper Limits on Anomalous X-Ray Pulsars 1E 1048.1-5937, 1RXS J170849-400910, and XTE J1810-197

Abstract

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 4.5 and 8.0 microns with the Infrared Array Camera and at 24 microns with the Multiband Imaging Photometer on the Spitzer Space Telescope. No mid-infrared counterparts were detected. As infrared emission from AXPs may be related to their X-ray emission either via the magnetosphere or via a dust disk, we compare the derived upper limits on the infrared/X-ray flux ratios of the AXPs to the same ratio for 4U 0142+61, an AXP previously detected in the mid-infrared range. The comparison indicates that our three non-detections are consistent with their relatively low X-ray fluxes. For XTE J1810-197, our upper limits set a constraint on its rising radio/millimeter energy spectrum, suggesting a spectral break between 1.5$\times 10^{11}$--6$\times 10^{13}$ Hz.

6 pages, 5 figures, ApJ, accepted

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Cited by in corpus (13)

• The McGill Magnetar Catalog
• Surface Emission from Neutron Stars and Implications for the Physics of their Interiors
• The variable radio-to-X-ray spectrum of the magnetar XTE J1810-197
• Optical, ultraviolet, and infrared observations of isolated neutron stars
• Ejecta, Dust, and Synchrotron Radiation in B0540-69.3: A More Crab-Like Remnant than the Crab
• A Mid-Infrared Counterpart to the Magnetar 1E 2259+586
• Electrodynamics of Magnetars IV: Self-Consistent Model of the Inner Accelerator, with Implications for Pulsed Radio Emission
• Optical/Infrared Observations of the Anomalous X-ray Pulsar 1E 1048.1-5937 During Its 2007 X-Ray Flare
• The influence of fallback discs on the spectral and timing properties of neutron stars
• Herschel and Spitzer observations of slowly rotating, nearby isolated neutron stars
• Constraints on fall-back disks in radio pulsars and anomalous X-ray pulsars
• Searching for Debris Disks around Seven Radio Pulsars
• Searching for Debris Disks around Isolated Pulsars