Gamma-ray Eclipses and Orbital Modulation Transitions in the Candidate Redback 4FGL J1702.7-5655
| dc.contributor.author | Corbet, Robin | |
| dc.contributor.author | Chomiuk, L. | |
| dc.contributor.author | Coley, J.B. | |
| dc.contributor.author | Dubus, G. | |
| dc.contributor.author | Edwards, P.G. | |
| dc.contributor.author | Islam, N. | |
| dc.contributor.author | McBride, V.A. | |
| dc.contributor.author | Stevens, J. | |
| dc.contributor.author | Strader, J. | |
| dc.contributor.author | Swihart, S.J. | |
| dc.contributor.author | Townsend, L.J. | |
| dc.date.accessioned | 2022-04-13T13:21:41Z | |
| dc.date.available | 2022-04-13T13:21:41Z | |
| dc.date.issued | 2022-03-10 | |
| dc.description.abstract | Observations with the Fermi Large Area Telescope (LAT) of the gamma-ray source 4FGL J1702.7-5655, previously classified as a candidate millisecond pulsar, show highly-significant modulation at a period of 0.2438033 days (~ 5.85 hours). Further examination of the folded light curve indicates the presence of narrow eclipses, suggesting this is a redback binary system. An examination of the long-term properties of the modulation over 13 years of LAT observations indicates that the orbital modulation of the gamma-rays changed from a simple eclipse before early 2013, to a broader, more easily detected, quasi-sinusoidal modulation. In addition, the time of the eclipse shifts to ~0.05 later in phase. This change in the orbital modulation properties is, however, not accompanied by a significant overall change in gamma-ray flux or spectrum. The quasi-sinusoidal component peaks ~0.5 out of phase with the eclipse, which would indicate inferior conjunction of the compact object in the system. Swift X-ray Telescope observations reveal a possible X-ray counterpart within the LAT error ellipse. However, radio observations obtained with the Australia Telescope Compact Array do not detect a source in the region. 4FGL J1702.7-5655 appears to have changed its state in 2013, perhaps related to changes in the intrabinary shock in the system. We discuss how the properties of 4FGL J1702.7-5655 compare to other binary millisecond pulsars that have exhibited orbital modulation in gamma rays. | en_US |
| dc.description.sponsorship | We thank Matthew Kerr and Zorawar Wadiasingh for useful comments. This work was partially supported by NASA Fermi grant 80NSSC21K2029 and also under NASA award number 80GSFC21M0002. J. Strader acknowledges support from a Packard Fellowship. This work was partially supported by NASA grant 80NSSC17K0507 and NSF grant AST-1714825. Portions of this work was performed while SJS held a NRC Research Associateship award at the Naval Research Laboratory. Work at the Naval Research Laboratory is supported by NASA DPR S-15633-Y. The Australia Telescope Compact Array is part of the Australia Telescope National Facility which is funded by the Australian Government for operation as a National Facility managed by CSIRO who acknowledge the Gomeroi people as the traditional owners of the Observatory site. We thank the Swift team for undertaking observations and this work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. The Fermi LAT Collaboration acknowledges generous ongoing support from a number of agencies and institutes that have supported both the development and the operation of the LAT as well as scientific data analysis. These include the National Aeronautics and Space Administration and the Department of Energy in the United States, the Commissariat `a l’Energie Atomique and the Centre National de la Recherche Scientifique / Institut National de Physique Nucl´eaire et de Physique des Particules in France, the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare in Italy, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), High Energy Accelerator Research Organization (KEK) and Japan Aerospace Exploration Agency (JAXA) in Japan, and the K. A. Wallenberg Foundation, the Swedish Research Council and the Swedish National Space Board in Sweden. Additional support for science analysis during the operations phase is gratefully acknowledged from the Istituto Nazionale di Astrofisica in Italy and the Centre National d’Etudes Spatiales in ´ France. | en_US |
| dc.description.uri | https://arxiv.org/abs/2203.05652 | en_US |
| dc.format.extent | 19 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.genre | preprints | en_US |
| dc.identifier | doi:10.13016/m22chh-2bq7 | |
| dc.identifier.uri | https://doi.org/10.48550/arXiv.2203.05652 | |
| dc.identifier.uri | http://hdl.handle.net/11603/24540 | |
| dc.language.iso | en_US | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Center for Space Sciences and Technology | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author. | en_US |
| dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) | * |
| dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
| dc.title | Gamma-ray Eclipses and Orbital Modulation Transitions in the Candidate Redback 4FGL J1702.7-5655 | en_US |
| dc.type | Text | en_US |
| dcterms.creator | https://orcid.org/0000-0002-3396-651X | en_US |