X-Ray Emission From J1446–4701, J1311–3430, and Other Black Widow Pulsars

Arumugasamy, Prakash; Pavlov, G. G.; Garmire, G. P.

doi:10.1088/0004-637x/814/2/90

Cited by 19 publications

(15 citation statements)

References 39 publications

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“…Although simple estimates indicate that the post-shock particles can cool on the IBS flow time scale and the shocked particles have a modest bulk Γ (Bogovalov et al 2012) so that some of this cooling radiation can reach the companion, the general effect of an IBS shock is to deflect pulsar power away from the companion. In addition the observed IBS radiation, while a substantial portion of the the X-ray band flux, is only L X ∼ 10 −3 − 10 −4Ė (Arumugasamy, Pavlov & Garmire 2015). Since IBS X-rays are emitted closer to the companion than the pulsar gamma-rays, they can be more effective at companion heating by ∼ β −1 .…”

Section: Basic Modelmentioning

confidence: 96%

B-ducted Heating of Black Widow Companions

Sánchez

Romani

2017

ApJ

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The companions of evaporating binary pulsars (black widows and related systems) show optical emission suggesting strong heating. In a number of cases large observed temperatures and asymmetries are inconsistent with direct radiative heating for the observed pulsar spindown power and expected distance. Here we describe a heating model in which the pulsar wind sets up an intrabinary shock (IBS) against the companion wind and magnetic field, and a portion of the shock particles duct along this field to the companion magnetic poles. We show that a variety of heating patterns, and improved fits to the observed light curves, can be obtained at expected pulsar distances and luminosities, at the expense of a handful of model parameters. We test this 'IBS-B' model against three well observed binaries and comment on the implications for system masses.

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Section: Basic Modelmentioning

confidence: 96%

B-ducted Heating of Black Widow Companions

Sánchez

Romani

2017

ApJ

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“…X-ray properties of BW pulsars were reviewed by Gentile et al (2014) and Arumugasamy et al (2015). They have hard power-law spectra and sometimes a soft thermal component from the neutron star surface.…”

Section: Xmm-newton Analysismentioning

confidence: 99%

“…Among this group, 1RXS J083842.1−282723 has the simplest light curve and power spectrum, and thus may be a key to interpreting the other, more complex cases. X-ray properties of BW pulsars were reviewed by Gentile et al ( 2014) and Arumugasamy et al (2015). They have hard power-law spectra and sometimes a soft thermal component from the neutron star surface.…”

Section: Xmm-newton Analysismentioning

confidence: 99%

X-Ray and Optical Study of the Gamma-ray Source 3FGL J0838.8–2829: Identification of a Candidate Millisecond Pulsar Binary and an Asynchronous Polar

Halpern¹,

Bogdanov²,

Thorstensen³

2017

ApJ

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We observed the field of the Fermi source 3FGL J0838.8−2829 in optical and X-rays, initially motivated by the cataclysmic variable (CV) 1RXS J083842.1−282723 that lies within its error circle. Several X-ray sources first classified as CVs have turned out to be γ-ray emitting millisecond pulsars (MSPs). We find that 1RXS J083842.1−282723 is in fact an unusual CV, a stream-fed asynchronous polar in which accretion switches between magnetic poles (that are ≈ 120• apart) when the accretion rate is at minimum. High-amplitude X-ray modulation at periods of 94.8±0.4 minutes and 14.7±1.2 hr are seen. The former appears to be the spin period, while the latter is inferred to be one-third of the beat period between the spin and the orbit, implying an orbital period of 98.3 ± 0.5 minutes. We also measure an optical emission-line spectroscopic period of 98.413 ± 0.004 minutes, which is consistent with the orbital period inferred from the X-rays. In any case, this system is unlikely to be the γ-ray source. Instead, we find a fainter variable X-ray and optical source, XMMU J083850.38−282756.8, that is modulated on a time scale of hours in addition to exhibiting occasional sharp flares. It resembles the black widow or redback pulsars that have been discovered as counterparts of Fermi sources, with the optical modulation due to heating of the photosphere of a low-mass companion star by, in this case, an as-yet undetected MSP. We propose XMMU J083850.38−282756.8 as the MSP counterpart of 3FGL J0838.8−2829.

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“…Based on the models of Romani & Sanchez (2016) and Wadiasingh et al (2017), this can be interpreted as a shock sweeping around the secondary star, presumably due to much weaker outflows from the lower mass secondary stars in these systems. The sample of black widow systems with detailed X-ray orbital light curves is currently very limited (see, e.g., Gentile et al 2014;Arumugasamy et al 2015), so at present we cannot establish whether this is a ubiquitous property of this class of eclipsing MSPs.…”

Section: Discussionmentioning

confidence: 95%

A Deep Chandra X-ray Observatory Study of the Millisecond Pulsar Population in the Globular Cluster Terzan 5

Bogdanov,

Bahramian,

Heinke

et al. 2020

Preprint

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We present an analysis of 745.6 ks of archival Chandra X-ray Observatory Advanced CCD Imaging Spectrometer data accumulated between 2000 and 2016 of the millisecond pulsar (MSP) population in the rich Galactic globular cluster Terzan 5. Eight of the 37 MSPs with precise positions are found to have plausible X-ray source matches. Despite the deep exposure, the remaining MSPs are either marginally detected or have no obvious X-ray counterparts, which can be attributed to the typically soft thermal spectra of rotation-powered MSPs, which are strongly attenuated by the high intervening absorbing column (∼ 10 22 cm −2 ) towards the cluster, and in some instances severe source crowding/blending. For the "redback" MSP binaries, PSRs J1748−2446P and J1748−2446ad, and the "black widow" binary PSRs J1748−2446O, we find clear evidence for large-amplitude X-ray variability at the orbital period consistent with an intrabinary shock origin. The third redback MSP in the cluster, PSR J1748−2446A, shows large amplitude variations in flux on time scales of years, possibility due to state transitions or intense flaring episodes from the secondary star.

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X-Ray Emission From J1446–4701, J1311–3430, and Other Black Widow Pulsars

Cited by 19 publications

References 39 publications

B-ducted Heating of Black Widow Companions

B-ducted Heating of Black Widow Companions

X-Ray and Optical Study of the Gamma-ray Source 3FGL J0838.8–2829: Identification of a Candidate Millisecond Pulsar Binary and an Asynchronous Polar

A Deep Chandra X-ray Observatory Study of the Millisecond Pulsar Population in the Globular Cluster Terzan 5

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