Back to Search
Start Over
Multiwavelength Evidence for a New Flare-mode Transitional Millisecond Pulsar.
- Source :
-
Astrophysical Journal . 8/20/2021, Vol. 917 Issue 2, p1-12. 12p. - Publication Year :
- 2021
-
Abstract
- We report the discovery of a new low-mass X-ray binary near the center of the unassociated Fermi GeV γ-ray source 4FGL J0540.0–7552. The source shows the persistent presence of an optical accretion disk and exhibits extreme X-ray and optical variability. It also has an X-ray spectrum well-fit by a hard power law with Γ = 1.8 and a high ratio of X-ray to γ-ray flux. Together, these properties are consistent with the classification of the binary as a transitional millisecond pulsar (tMSP) in the subluminous disk state. Uniquely among the candidate tMSPs, 4FGL J0540.0–7552 shows consistent optical, X-ray, and γ-ray evidence for having undergone a state change, becoming substantially brighter in the optical and X-rays and fainter in GeV γ-rays sometime in mid-2013. In its current subluminous disk state, and like one other candidate tMSP in the Galactic field, 4FGL J0540.0–7552 appears to always be in an X-ray "flare mode," indicating that this could be common phenomenology for tMSPs. [ABSTRACT FROM AUTHOR]
- Subjects :
- *X-ray binaries
*X-ray spectra
*PULSARS
*ACCRETION disks
*X-rays
*EVIDENCE
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 917
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 152190109
- Full Text :
- https://doi.org/10.3847/1538-4357/ac0b47