Radio emission from two anomalous X-ray pulsars

Malofeev, V. M.; Malov, O. I.; Teplykh, D. A.; Tyul’bashev, S. A.; Tyul’basheva, G. E.

doi:10.1134/1.1882782

Cited by 43 publications

(39 citation statements)

References 20 publications

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“…For a pulse duty cycle of 5%, they obtained flux density upper limits of 0.33 and 0.06 mJy at 0.78 and 2.9 GHz, respectively. Recently, Malofeev et al (2005Malofeev et al ( , 2007 reported the detection of weak radio emission from two XDINSs, RX J1308.6+2127 and RX J2143.0+0654, at the very low frequency of 111 MHz with the Large Phased Array (BSA) at Puschino Radio Observatory. They measured flux densities of 50 ± 20 and 60 ± 25 mJy, for RX J1308.6+2127 and RX J2143.0+0654, respectively.…”

Section: Introductionmentioning

confidence: 99%

New Limits on Radio Emission From X-Ray Dim Isolated Neutron Stars

Kondratiev

McLaughlin

Lorimer

et al. 2009

ApJ

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We have carried out a search for radio emission at 820 MHz from six X-ray dim isolated neutron stars (XDINSs) with the Robert C. Byrd Green Bank Radio Telescope. No transient or pulsed emission was found using fast folding, fast Fourier transform, and single-pulse searches. The corresponding flux limits are about 0.01 mJy for pulsed emission, depending on the integration time for the particular source and assuming a duty cycle of 2%, and 20 mJy for single dispersed pulses. These are the most sensitive limits to date on radio emission from XDINSs. There is no evidence for isolated radio pulses, as seen in a class of neutron stars known as rotating radio transients. Our results imply that either the radio luminosities of these objects are lower than those of any known radio pulsars, or they could simply be long-period nearby radio pulsars with high magnetic fields beaming away from the Earth. To test the latter possibility, we would need around 40 similar sources to provide a 1σ probability of at least one of them beaming toward us. We also give a detailed description of our implementation of the Fast Folding Algorithm.

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Section: Introductionmentioning

confidence: 99%

New Limits on Radio Emission From X-Ray Dim Isolated Neutron Stars

Kondratiev

McLaughlin

Lorimer

et al. 2009

ApJ

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“…Also, the non-detection of radio emission from X-ray dim isolated neutron stars (XDINSs) thus far (Kondratiev et al 2009), could be due to the beams of these long-period sources being quite narrow at high frequencies and there may be a better chance to detect them in radio at LOFAR frequencies. In fact, weak radio emission from two XDINSs, RX J1308.6+2127 and RX J2143.0+0654, was reported by Malofeev et al (2005Malofeev et al ( , 2007 at 111 MHz, hence it would be important to confirm this detection with LOFAR. This is also the case for the pulsars discovered in blind searches of Fermi gamma-ray photons, many of which do not exhibit detectable radio emission (Abdo et al 2009(Abdo et al , 2010b, as well as the remaining unidentified gamma-ray sources, which have characteristics of radio pulsars but which have not yet been detected in the radio (Abdo et al 2010a).…”

Section: New Populationsmentioning

confidence: 99%

Observing pulsars and fast transients with LOFAR

Stappers

Hessels

Alexov

et al. 2011

A&A

213

160

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Low frequency radio waves, while challenging to observe, are a rich source of information about pulsars. The LOw Frequency ARray (LOFAR) is a new radio interferometer operating in the lowest 4 octaves of the ionospheric "radio window": 10-240 MHz, that will greatly facilitate observing pulsars at low radio frequencies. Through the huge collecting area, long baselines, and flexible digital hardware, it is expected that LOFAR will revolutionize radio astronomy at the lowest frequencies visible from Earth. LOFAR is a next-generation radio telescope and a pathfinder to the Square Kilometre Array (SKA), in that it incorporates advanced multi-beaming techniques between thousands of individual elements. We discuss the motivation for low-frequency pulsar observations in general and the potential of LOFAR in addressing these science goals. We present LOFAR as it is designed to perform high-time-resolution observations of pulsars and other fast transients, and outline the various relevant observing modes and data reduction pipelines that are already or will soon be implemented to facilitate these observations. A number of results obtained from commissioning observations are presented to demonstrate the exciting potential of the telescope. This paper outlines the case for low frequency pulsar observations and is also intended to serve as a reference for upcoming pulsar/fast transient science papers with LOFAR.

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“…However, until recently all AXPs were radio quiet. For AXP 1E 2259+58 the detection of radio emission has now been claimed by Malofeev et al (2005), but the observations and analysis were difficult and confirmation is required. Halpern et al (2005) discovered transient radio emission from the transient AXP XTE J1810-197 which appeared sharply modulated at the rotation period with peak flux densities >1 Jy (Camilo et al 2006), orders of magnitude brighter than the reported upper limits for this or any other AXP.…”

Section: Introductionmentioning

confidence: 99%

The first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays

Hartog

Kuiper

Hermsen

et al. 2007

Astrophys Space Sci

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For the first time a quasi-simultaneous multiwavelength campaign has been performed on an Anomalous X-ray Pulsar from the radio to the hard X-ray band. 4U 0142+61 was an INTEGRAL target for 1 Ms in July 2005. During these observations it was also observed in the X-ray band with Swift and RXTE, in the optical and NIR with Gemini North and in the radio with the WSRT. In this paper we present the source-energy distribution. The spectral results obtained in the individual wave bands do not connect smoothly; apparently components of different origin contribute to the total spectrum. Remarkable is that the INTEGRAL hard X-ray spectrum (power-law index 0.79 ± 0.10) is now measured up to an energy of ∼230 keV with no indication of a spectral break. Extrapolation of the INTEGRAL power-law spectrum to lower energies passes orders of magnitude underneath the NIR and optical fluxes,

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Radio emission from two anomalous X-ray pulsars

Cited by 43 publications

References 20 publications

New Limits on Radio Emission From X-Ray Dim Isolated Neutron Stars

New Limits on Radio Emission From X-Ray Dim Isolated Neutron Stars

Observing pulsars and fast transients with LOFAR

The first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays

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