{"title":"GMRT观测到的PSR J1544+4937日食截止频率的剧烈变化","authors":"Sangita Kumari, B. Bhattacharyya","doi":"10.23919/URSI-RCRS56822.2022.10118502","DOIUrl":null,"url":null,"abstract":"We report a very drastic change in the eclipse cut-off frequency for the black widow pulsar J1544+4937. Majority of such systems often exhibit relatively long duration (~ 15%) radio eclipses caused by ablated material from the companion stars. The eclipse observed in such systems are frequency dependent and are more pronounced at lower frequencies (< 1.5 MHz). The eclipse cutoff frequency has changed from 345 MHz to > 750 MHz. Such an intense change in the eclipse cutoff frequency is not observed and reported for any other spider MSPs before. This shows that PSR J1544+4937 is clearly undergoing some kind of transition, where the eclipse environment is dynamically evolving. Follow-up observations showed that the system is coming back to its normal state, where the eclipse cutoff frequency is < 550 MHz. This change in the eclipse cut-off frequency could depict changes of the magnetic field and drastic change in electron density in the eclipse region.","PeriodicalId":229743,"journal":{"name":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Drastic Change in the Eclipse Cutoff Frequency for PSR J1544+4937 Observed with the GMRT\",\"authors\":\"Sangita Kumari, B. Bhattacharyya\",\"doi\":\"10.23919/URSI-RCRS56822.2022.10118502\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We report a very drastic change in the eclipse cut-off frequency for the black widow pulsar J1544+4937. Majority of such systems often exhibit relatively long duration (~ 15%) radio eclipses caused by ablated material from the companion stars. The eclipse observed in such systems are frequency dependent and are more pronounced at lower frequencies (< 1.5 MHz). The eclipse cutoff frequency has changed from 345 MHz to > 750 MHz. Such an intense change in the eclipse cutoff frequency is not observed and reported for any other spider MSPs before. This shows that PSR J1544+4937 is clearly undergoing some kind of transition, where the eclipse environment is dynamically evolving. Follow-up observations showed that the system is coming back to its normal state, where the eclipse cutoff frequency is < 550 MHz. This change in the eclipse cut-off frequency could depict changes of the magnetic field and drastic change in electron density in the eclipse region.\",\"PeriodicalId\":229743,\"journal\":{\"name\":\"2022 URSI Regional Conference on Radio Science (USRI-RCRS)\",\"volume\":\"5 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2022-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"2022 URSI Regional Conference on Radio Science (USRI-RCRS)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.23919/URSI-RCRS56822.2022.10118502\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"2022 URSI Regional Conference on Radio Science (USRI-RCRS)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.23919/URSI-RCRS56822.2022.10118502","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Drastic Change in the Eclipse Cutoff Frequency for PSR J1544+4937 Observed with the GMRT
We report a very drastic change in the eclipse cut-off frequency for the black widow pulsar J1544+4937. Majority of such systems often exhibit relatively long duration (~ 15%) radio eclipses caused by ablated material from the companion stars. The eclipse observed in such systems are frequency dependent and are more pronounced at lower frequencies (< 1.5 MHz). The eclipse cutoff frequency has changed from 345 MHz to > 750 MHz. Such an intense change in the eclipse cutoff frequency is not observed and reported for any other spider MSPs before. This shows that PSR J1544+4937 is clearly undergoing some kind of transition, where the eclipse environment is dynamically evolving. Follow-up observations showed that the system is coming back to its normal state, where the eclipse cutoff frequency is < 550 MHz. This change in the eclipse cut-off frequency could depict changes of the magnetic field and drastic change in electron density in the eclipse region.