A multiwavelength search for black widow and redback counterparts of candidate γ-ray millisecond pulsars

Braglia, C; Mignani, Roberto; Belfiore, A.; Marelli, M.; Israel, G. L.; Novara, G.; Luca, A. De; Tiengo, A.; Parkinson, P. M. Saz

doi:10.1093/mnras/staa2339

Cited by 8 publications

(4 citation statements)

References 52 publications

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“…Wang et al (2020) suggested that follow-up observations be conducted to determine if the binary is in fact a transitional MSP in an accretion-driven state or, potentially, the rotationally-powered MSP state that would follow. Braglia et al (2020) also reported two new spider candidates in a similar fashion. By searching for optical variations in archival survey data for systems that had possible associated X-ray counterparts within the Fermi uncertainty region, they identified 4FGL J1627.7+3219 and 4FGL J2212.4+0708 as candidates.…”

Section: Introductionmentioning

confidence: 73%

No MSP Counterparts Detected in GBT Searches of Spider Candidates 4FGL J0935.3+0901, 4FGL J1627.7+3219, and 4FGL J2212.4+0708

Corcoran¹,

Ransom²,

Lynch³

2023

Preprint

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We performed radio searches for the "spider" millisecond pulsar (MSP) candidates 4FGL J0935.3+0901, 4FGL J1627.7+3219, and 4FGL J2212.4+0708 using the Green Bank Telescope in an attempt to detect the proposed radio counterpart of the multi-wavelength variability seen in each system. We observed using the VEGAS spectrometer, centered predominantly at 2165 MHz; however, we were also granted observations at 820 MHz for 4FGL J1627.7+3219. We performed acceleration searches on each dataset using PRESTO as well as additional jerk searches of select observations. We see no evidence of a radio counterpart in any of the observations for each of the three systems at this time. Additional observations, perhaps at different orbital phases (e.g., inferior conjunction), may yield detections of an MSP in the future. Therefore, we urge continued monitoring of these systems to fully characterize the radio nature, however faint or variable, of each system.

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Section: Introductionmentioning

confidence: 73%

No MSP Counterparts Detected in GBT Searches of Spider Candidates 4FGL J0935.3+0901, 4FGL J1627.7+3219, and 4FGL J2212.4+0708

Corcoran¹,

Ransom²,

Lynch³

2023

Preprint

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“…In fact, three of our targets, 1FGL J0523.5−2529 (Strader et al 2014), 1FGL J1119.9 −2205 (Swihart et al 2022b), and 1FGL J1544.5−1127 (Strader et al 2019), have been suggested to be redbacks through the identification of a plausible optical counterpart. PSR J0955−3947, another redback candidate (Braglia et al 2020), was recently confirmed as a short-orbit pulsar by TRAPUM 29 (Clark et al 2023a).…”

Section: Implications For γ-Ray Pulsar Population Statisticsmentioning

confidence: 95%

A 350 MHz Green Bank Telescope Survey of Unassociated Fermi LAT Sources: Discovery and Timing of 10 Millisecond Pulsars

Bangale,

Bhattacharyya,

Camilo

et al. 2024

ApJ

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We have searched for radio pulsations toward 49 Fermi Large Area Telescope (LAT) 1FGL Catalog γ-ray sources using the Green Bank Telescope at 350 MHz. We detected 18 millisecond pulsars (MSPs) in blind searches of the data; 10 of these were discoveries unique to our survey. 16 are binaries, with eight having short orbital periods P B < 1 day. No radio pulsations from young pulsars were detected, although three targets are coincident with apparently radio-quiet γ-ray pulsars discovered in LAT data. Here, we give an overview of the survey and present radio and γ-ray timing results for the 10 MSPs discovered. These include the only isolated MSP discovered in our survey and six short-P B binary MSPs. Of these, three have very-low-mass companions (M c ≪ 0.1 M ⊙) and hence belong to the class of black widow pulsars. Two have more massive, nondegenerate companions with extensive radio eclipses and orbitally modulated X-ray emission consistent with the redback class. Significant γ-ray pulsations have been detected from nine of the discoveries. This survey and similar efforts suggest that the majority of Galactic γ-ray sources at high Galactic latitudes are either MSPs or relatively nearby nonrecycled pulsars, with the latter having on average a much smaller radio/γ-ray beaming ratio as compared to MSPs. It also confirms that past surveys suffered from an observational bias against finding short-P B MSP systems.

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“…In particular, the distribution of unassociated Fermi sources in galactic latitude suggests a likely Galactic origin for a significant fraction of the 2600 unidentified sources. While a significant fraction of these low-latitude sources may originate from mismodeled diffuse emission (Abdollahi et al 2022), it is a promising effort to search for new pulsars in individual unassociated Fermi sources, as numerous previous studies have shown (e.g., Au et al 2023;Bruzewski et al 2023;Hare et al 2022;Braglia et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Searching for X-ray counterparts of unassociated Fermi-LAT sources and rotation-powered pulsars with SRG/eROSITA

Mayer,

Becker

2024

A&A

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The latest source catalog of the Fermi -LAT telescope contains more than 7000 gamma -ray sources at giga-electronvolt energies, with the two dominant source classes thought to be blazars and rotation-powered pulsars. Despite continuous follow-up efforts, around 2600 sources have no known multiwavelength association. Our target is the identification of possible (young and recycled) pulsar candidates in the sample of unassociated gamma -ray sources via their characteristic X-ray and gamma -ray emission. To achieve this, we cross-matched the Fermi -LAT catalog with the catalog of X-ray sources in the western Galactic hemisphere from the first four all-sky surveys of eROSITA on the Spektrum-Roentgen-Gamma ( SRG ) mission. We complement this by identifying X-ray counterparts of known pulsars detected at gamma -ray and radio energies in the eROSITA data. We used a Bayesian cross-matching scheme to construct a probabilistic catalog of possible pulsar-type X-ray counterparts to Fermi -LAT sources. Our method combines the overlap of X-ray and gamma -ray source positions with a probabilistic classification (into pulsar and blazar candidates) of each source based on its gamma -ray properties and a prediction on the X-ray flux of pulsar- or blazar-type counterparts. Finally, an optical and infrared counterpart search was performed to exclude coronally emitting stars and active galactic nuclei from our catalog. We provide a catalog of our prior gamma -ray-based classifications of all 2600 unassociated sources in the Fermi -LAT catalog, with around equal numbers of pulsar and blazar candidates. Our final list of candidate X-ray counterparts to suspected new high-energy pulsars, cleaned for spurious detections and sources with obvious non-pulsar counterparts, contains around 900 X-ray sources, the vast majority of which lie in the 95<!PCT!> gamma -ray error ellipse. We predict between 30 and 40 new pulsars among our top 200 candidates, with around equal numbers of young and recycled pulsars. This candidate list may serve as input to future follow-up campaigns, looking directly for pulsations or for the orbital modulation of possible binary companions, where it may allow for a drastic reduction in the number of candidate locations to search. We furthermore detect the X-ray counterparts of 15 known rotation-powered pulsars, which were not seen in X-rays before.

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A multiwavelength search for black widow and redback counterparts of candidate γ-ray millisecond pulsars

Cited by 8 publications

References 52 publications

No MSP Counterparts Detected in GBT Searches of Spider Candidates 4FGL J0935.3+0901, 4FGL J1627.7+3219, and 4FGL J2212.4+0708

No MSP Counterparts Detected in GBT Searches of Spider Candidates 4FGL J0935.3+0901, 4FGL J1627.7+3219, and 4FGL J2212.4+0708

A 350 MHz Green Bank Telescope Survey of Unassociated Fermi LAT Sources: Discovery and Timing of 10 Millisecond Pulsars

Searching for X-ray counterparts of unassociated Fermi-LAT sources and rotation-powered pulsars with SRG/eROSITA

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