Thermal Emission and Magnetic Beaming in the Radio and X-Ray Mode-switching PSR B0943+10

Rigoselli, Michela; Mereghetti, S.; Turolla, R.; Taverna, Roberto; Suleimanov, V.; Potekhin, A. Y.

doi:10.3847/1538-4357/aafac7

Cited by 19 publications

(13 citation statements)

References 50 publications

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“…The angular pattern of the emerging intensity depends also on the local surface temperature and magnetic field, so that the morphology of the pulse profiles can be extremely variegate. Using a partially ionized hydrogen atmosphere model (Suleimanov et al 2009) with improved opacities from Potekhin et al (2014), we computed the expected pulse profiles, as described in Rigoselli et al (2019). The best match with the data was obtained assuming emission from two antipodal hot spots with an effective temperature of 0.5 MK, and ξ = 30 • , χ = 35 • .…”

Section: Discussionmentioning

confidence: 99%

XMM-Newton observations of PSR J0726−2612, a radio-loud XDINS

Rigoselli

Mereghetti

Suleimanov

et al. 2019

A&A

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We present the results of an XMM-Newton observation of the slowly rotating (P = 3.4 s), highly magnetized (B ≈ 3×10 13 G) radio pulsar PSR J0726−2612. A previous X-ray observation with the Chandra satellite showed that some of the properties of PSR J0726−2612 are similar to those of the X-ray Dim Isolated Neutron Stars (XDINSs), a small class of nearby slow pulsars characterized by purely thermal X-ray spectra and undetected in the radio band. We confirm the thermal nature of the X-ray emission of PSR J0726−2612, which can be fit by the sum of two blackbodies with temperatures kT 1 = 0.074 +0.006 −0.011 keV and kT 2 = 0.14 +0.04 −0.02 keV and emitting radii R 1 = 10.4 +10.8 −2.8 km and R 2 = 0.5 +0.9 −0.3 km, respectively (assuming a distance of 1 kpc). A broad absorption line modeled with a Gaussian profile centred at 0.39 +0.02 −0.03 keV is required in the fit. The pulse profile of PSR J0726−2612 is characterized by two peaks with similar intensity separated by two unequal minima, a shape and pulsed fraction that cannot be reproduced without invoking magnetic beaming of the X-ray emission. The presence of a single radio pulse suggests that in PSR J0726−2612 the angles that the dipole axis and the line of sight make with the rotation axis, ξ and χ respectively, are similar. This geometry differs from that of the two radio-silent XDINSs with a double peaked pulse profile similar to that of PSR J0726−2612, for which ξ ∼ 90 • and χ ∼ 45 • have been recently estimated. These results strengthen the similarity between PSR J0726−2612 and the XDINSs and support the possibility that the lack of radio emission from the latter might simply be due to an unfavourable viewing geometry.

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Section: Discussionmentioning

confidence: 99%

XMM-Newton observations of PSR J0726−2612, a radio-loud XDINS

Rigoselli

Mereghetti

Suleimanov

et al. 2019

A&A

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“…In order to maximize the signal-to-noise ratio for these generally faint sources, we extracted their EPIC-pn spectra using the maximum likelihood method as described in Rigoselli et al (2019bRigoselli et al ( , 2021. The energy bins are chosen in such a way to have a significant detection, that means at least 50 counts per bin.…”

Section: Analysis Of the Six Unknown Sourcesmentioning

confidence: 99%

Candidate isolated neutron stars in the 4XMM-DR10 catalog of X-ray sources

Rigoselli,

Mereghetti,

Tresoldi

2021

Preprint

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Most isolated neutron stars have been discovered thanks to the detection of their pulsed nonthermal emission, at wavelengths spanning from radio to gamma-rays. However, if the beamed non-thermal radiation does not intercept our line of sight or it is too faint or absent, isolated neutron stars can also be detected through their thermal emission, which peaks in the soft X-ray band and is emitted nearly isotropically. In the past thirty years, several thermally-emitting isolated neutron stars have been discovered thanks to X-ray all-sky surveys, observations targeted at the center of supernova remnants, or as serendipitous X-ray sources. Distinctive properties of these relatively rare X-ray sources are very soft spectra and high ratios of X-ray to optical flux. The recently released 4XMM-DR10 catalog contains more than half a million Xray sources detected with the XMM-Newton telescope in the 0.2-10 keV range in observations carried out from 2000 to 2019. Based on a study of the spectral properties of these sources and on cross-correlations with catalogs of possible counterparts, we have carried out a search of isolated neutron stars, finding four potential candidates. The spectral and long-term variability analysis of these candidates, using also Chandra and Swift-XRT data, allowed us to point out the most interesting sources deserving further multiwavelength investigations.

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“…Multiwavelength monitoring of unusual pulsars such as the radio-loud magnetars and transition objects can shed light onto potential magnetospheric differences between the diverse neutron star populations (Camilo et al 2018;Dai et al 2018). Finally, the radio-X-ray correlation in mode-switching pulsars can put models of the pulsar magnetosphere to the test (Hermsen et al 2013;Rigoselli et al 2019).…”

Section: The Thousand-pulsar-array Programmementioning

confidence: 99%

The Thousand-Pulsar-Array programme on MeerKAT – I. Science objectives and first results

Johnston

Karastergiou

Keith

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We report here on initial results from the Thousand Pulsar Array (TPA) programme, part of the Large Survey Project "MeerTime" on the MeerKAT telescope. The interferometer is used in tied-array mode in the band from 856 to 1712 MHz, and the wide band coupled with the large collecting area and low receiver temperature make it an excellent telescope for the study of radio pulsars. The TPA is a 5 year project which aims to observe (a) more than 1000 pulsars to obtain high-fidelity pulse profiles, (b) some 500 of these pulsars over multiple epochs, (c) long sequences of single-pulse trains from several hundred pulsars. The scientific outcomes from the programme will include determination of pulsar geometries, the location of the radio emission within the pulsar magnetosphere, the connection between the magnetosphere and the crust and core of the star, tighter constraints on the nature of the radio emission itself as well as interstellar medium studies. First results presented here include updated dispersion measures, 26 pulsars with Faraday rotation measures derived for the first time and a description of interesting emission phenomena observed thus far.

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Thermal Emission and Magnetic Beaming in the Radio and X-Ray Mode-switching PSR B0943+10

Cited by 19 publications

References 50 publications

XMM-Newton observations of PSR J0726−2612, a radio-loud XDINS

XMM-Newton observations of PSR J0726−2612, a radio-loud XDINS

Candidate isolated neutron stars in the 4XMM-DR10 catalog of X-ray sources

The Thousand-Pulsar-Array programme on MeerKAT – I. Science objectives and first results

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