Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/30267
Title: | A Search for Transitions between States in Redbacks and Black Widows Using Seven Years of Fermi-LAT Observations | Authors: | Torres, Diego F. Ji, Long Li, Jian PAPITTO, ALESSANDRO Rea, Nanda de Oña Wilhelmi, Emma Zhang, Shu |
Issue Date: | 2017 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 836 | Issue: | 1 | First Page: | 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 |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Torres_2017_ApJ_836_68.pdf | Pdf editoriale | 1.29 MB | Adobe PDF | View/Open |
Page view(s)
55
checked on Apr 24, 2024
Download(s)
18
checked on Apr 24, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.