No detectable radio emission from the magnetar-like pulsar in Kes 75
Bibliographic record
Abstract
The rotation-powered pulsar PSR J1846À0258 in the supernova remnant Kes 75 was recently shown to have exhibited magnetar-like X-ray bursts in mid-2006.Radio emission has not yet been observed from this source, but other magnetar-like sources have exhibited transient radio emission following X-ray bursts.We report on a deep 1.9 GHz radio observation of PSR J1846À0258 with the 100 m Green Bank Telescope in late 2007, designed to search for radio pulsations or bursts from this target.We have also analyzed three shorter serendipitous 1.4 GHz radio observations of the source taken with the 64 m Parkes telescope during the 2006 bursting period.We detected no radio emission from PSR J1846À0258 in either the Green Bank or Parkes data sets.We place an upper limit of 4.9 Jy on coherent pulsed emission from PSR J1846À0258 based on the 2007 November 2 observation, and an upper limit of 27 Jy around the time of the X-ray bursts.Serendipitously, we observed radio pulses from the nearby RRAT J1846À02, and place a 3 confidence level upper limit on its period derivative of 1:7 ; 10 À13 , implying its surface dipole magnetic field is less than 2:6 ; 10 13 G.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".