Blind search for radio-quiet and radio-loud gamma-ray pulsars with Fermi-LAT data
| Autor: | Rubtsov, G. I., Sokolova, E. V. |
|---|---|
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Pis'ma v ZhETF 100:787-792, 2014 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.7868/S0370274X14230015 |
| Popis: | The Fermi Large Area Telescope (LAT) has observed more than a hundred of gamma-ray pulsars, about one third of which are radio-quiet, i.e. not detected at radio frequencies. The most of radio-loud pulsars are detected by Fermi LAT by using the radio timing models, while the radio-quiet ones are discovered in a blind search. The difference in the techniques introduces an observational selection bias and, consequently, the direct comparison of populations is complicated. In order to produce an unbiased sample, we perform a blind search of gamma-ray pulsations using Fermi-LAT data alone. No radio data or observations at optical or X-ray frequencies are involved in the search process. We produce a gamma-ray selected catalog of 25 non-recycled gamma-ray pulsars found in a blind search, including 16 radio-quiet and 9 radio-loud pulsars. This results in the direct measurement of the fraction of radio-quiet pulsars $\varepsilon_{RQ} = 64\pm 10\%$, which is in agreement with the existing estimates from the population modeling in the outer magnetosphere model. The Polar cap models are disfavored due to a lower expected fraction and the prediction of age dependence. The age, gamma-ray energy flux, spin-down luminosity and sky location distributions of the radio-loud and radio-quiet pulsars from the catalog do not demonstrate any statistically significant difference. The results indicate that the radio-quiet and radio-loud pulsars belong to one and the same population. The catalog shows no evidence for the radio beam evolution. Comment: 5 pages, 3 figures; accepted for publication in JETP Letters |
| Databáze: | arXiv |
| Externí odkaz: |
|