Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/30267
Titolo: | A Search for Transitions between States in Redbacks and Black Widows Using Seven Years of Fermi-LAT Observations | Autori: | Torres, Diego F. Ji, Long Li, Jian PAPITTO, ALESSANDRO Rea, Nanda de Oña Wilhelmi, Emma Zhang, Shu |
Data pubblicazione: | 2017 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 836 | Fascicolo: | 1 | Da pagina:: | 68 | Abstract: | Considering about seven years of Fermi-Large Area Telescope (LAT) data, we present a systematic search for variability that is possibly related to transitions between states in redbacks and black widow systems. The transitions are characterized by sudden and significant changes in the gamma-ray flux that persist on a timescale that is much larger than the orbital period. This phenomenology was already detected in the case of two redback systems, PSR J1023+0038 and PSR J1227-4853, which we present here. We show the existence of only one transition for each of these systems over the past seven years. We determine their spectra, establishing high-energy cutoffs at a few GeV for the high gamma-ray state of PSR J1023+0038, and for both states of PSR J1227-4853. The surveying capability of the Fermi-LAT allows further study of whether similar phenomenology has occurred in other sources. Although we have not found any evidence of a state transition for most of the studied pulsars, we note two black-widow systems, PSR J2234+0944 and PSR J1446-4701, whose apparent variabilities are reminiscent of the transitions in PSR J1023+0038 and PSR J1227-4853. For the other systems, we set limits on potential transitions in their measured gamma-ray light curves. | URI: | http://hdl.handle.net/20.500.12386/30267 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/836/1/68 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/836/1/68 | Bibcode ADS: | 2017ApJ...836...68T | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
Torres_2017_ApJ_836_68.pdf | Pdf editoriale | 1.29 MB | Adobe PDF | Visualizza/apri |
Page view(s)
55
controllato il 25-apr-2024
Download(s)
18
controllato il 25-apr-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.