The FRB 20190203 radio signal arrived at Terra from a distant galaxy. The pulse was recorded by the Large Phased Array telescope, on the Rússia. The event lasted 211 milliseconds and showed unusual properties for fast radio bursts.
The phenomenon occurred on February 3, 2019. The detection took place during monitoring of pulsars in the Pushchino Multibeams Pulsar Search project. The signal exhibited a dispersion measurement of 134.4 pc/cm³, which points to an extragalactic origin around 2.3 billion light years away.
Detalhes Technical Pulse FRB 20190203
The burst reached a peak flux density of 20 Jy at a frequency of 111 MHz. Essa marks the event among the most powerful ever observed in the metric band. The pulse has not repeated since initial detection.
- Frequência detection: 111 MHz, one of the lowest for FRBs
- Duração: 211 milliseconds
- Medida dispersion: 134.4 pc/cm³
- Peak Fluxo: 20 Jy
- Estimated Distância: 2.3 billion light years
- Sem detection of associated gamma rays
Nenhum repeated signal has been found so far. Buscas in data from the INTEGRAL observatory also did not identify a high-energy counterpart.
The Russian telescope operates with high sensitivity at long wavelengths. Isso made it possible to capture the event during technical verification of observations. The low frequency makes the discovery rare in the field of FRBs.
Extragalactic Origem and unique properties
The high dispersion measurement confirms that the signal passed through intergalactic material. Depois after discounting Via Láctea’s contribution, there is an excess compatible with a distance of 713 megaparsecs. The calculated intrinsic brightness is around 10^34 erg/s/Hz.
FRB 20190203 stands out for having no observed repeats. Most known low-frequency bursts repeat or exhibit multiple activity. The absence of simultaneous gamma emission adds complexity to the analysis.
Astrônomos analyzed INTEGRAL files for 73 days of accumulated exposure in the region. Nenhum transient event above noise was recorded. Isso reinforces the isolated character of the pulse.
Modelos scientists to explain the burst
The team proposes magnetar-excited synchrotron maser emission. The scenario involves a distant reverse shock around 10^15 cm from the object. The energy conversion efficiency of the shock to radio would need to reach 1% to reproduce the observations.
Outras hypotheses for FRBs include supernova remnants, cosmic strings, or processes in highly magnetized neutron stars. The case of FRB 20190203 favors the magnetar model due to the combination of energy, duration, and lack of repetition.
The detection paves the way for studies at low frequencies. Poucos instruments can operate with sufficient sensitivity in this range to capture extragalactic FRBs.
Impacto in researching fast radio bursts
The event is the second FRB recorded on 111 MHz and the first among non-repeaters. The discovery expands knowledge about the population of these phenomena at long wavelengths. Telescópios like LPA could contribute more in the future.
Cientistas continues to monitor the region of the sky corresponding to the signal. Novas observations at multiple frequencies can help identify the exact host galaxy. The lack of repetition thus far suggests that the mechanism may be different from known active sources.
The finding fuels discussions about the diversity of mechanisms behind FRBs. Alguns bursts come from extreme environments, while others appear isolated.
Próximos steps in investigation
Equipes plan deeper searches for repeats or counterparts in other bands. Using more sensitive telescopes at low frequency could reveal similar events. Theoretical Modelos will be tested with the precise parameters of FRB 20190203.
The astronomical community is following the case with interest. The pulse demonstrates that the universe still holds surprises even at frequencies explored decades ago. Avanços instruments should allow more frequent detections in the coming years.