Surveying the X-ray Behavior of Novae as They Emit γ-rays
| dc.contributor.author | Gordon, Alexa C. | |
| dc.contributor.author | Aydi, Elias | |
| dc.contributor.author | Page, Kim L. | |
| dc.contributor.author | Li, Kwan-Lok | |
| dc.contributor.author | Chomiuk, Laura | |
| dc.contributor.author | Sokolovsky, Kirill V. | |
| dc.contributor.author | Mukai, Koji | |
| dc.contributor.author | Seitz, Joseph | |
| dc.date.accessioned | 2020-12-14T17:27:32Z | |
| dc.date.available | 2020-12-14T17:27:32Z | |
| dc.description.abstract | The detection of GeV γ-ray emission from Galactic novae by Fermi-LAT has become routine since 2010, and is generally associated with shocks internal to the nova ejecta. These shocks are also expected to heat plasma to ∼10⁷ K, resulting in detectable X-ray emission. In this paper, we investigate 13 γ-ray emitting novae observed with the Neil Gehrels Swift Observatory, searching for 1-10 keV X-ray emission concurrent with γ-ray detections. We also analyze γ-ray observations of novae V407 Lup (2016) and V357 Mus (2018). We find that most novae do eventually show X-ray evidence of hot shocked plasma, but not until the γ-rays have faded below detectability. We suggest that the delayed rise of the X-ray emission is due to large absorbing columns and/or X-ray suppression by corrugated shock fronts. The only nova in our sample with a concurrent X-ray/γ-ray detection is also the only embedded nova (V407 Cyg). This exception supports a scenario where novae with giant companions produce shocks with external circumbinary material and are characterized by lower density environments, in comparison with novae with dwarf companions where shocks occur internal to the dense ejecta. | en_US |
| dc.description.sponsorship | We are grateful to Tommy Nelson and Brian Metzger for conversations that inspired this work. ACG, EA, LC, KVS, and JS are grateful for the support of NASA Fermi grant 80NSSC18K1746, NuSTAR grant 80NSSC19K0522, NSF award AST-1751874, and a Cottrell Scholarship of the Research Corporation. KLP acknowledges funding from the UK Space Agency. KLL is supported by the Ministry of Science and Technology of the Republic of China (Taiwan) through grants 108-2112-M-007-025-MY3 and 109-2636-M-006-017, and he is a Yushan (Young) Scholar of the Ministry of Education of the Republic of China (Taiwan). This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. We acknowledge with thanks the variable star observations from the AAVSO International Database contributed by observers worldwide and used in this research. We also acknowledge with thanks the Astronomical Ring for Access to Spectroscopy ARAS observers for their optical spectroscopic observations. | en_US |
| dc.description.uri | https://arxiv.org/abs/2010.15930 | en_US |
| dc.format.extent | 23 pages | en_US |
| dc.genre | journal articles preprints | en_US |
| dc.identifier | doi:10.13016/m2fynh-cw70 | |
| dc.identifier.citation | Alexa C. Gordon, Elias Aydi, Kim L. Page, Kwan-Lok Li, Laura Chomiuk, Kirill V. Sokolovsky, Koji Mukai and Joseph Seitz, Surveying the X-ray Behavior of Novae as They Emit γ-rays, https://arxiv.org/abs/2010.15930 | en_US |
| dc.identifier.uri | http://hdl.handle.net/11603/20259 | |
| 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.relation.ispartof | UMBC Physics Department | |
| 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. | |
| dc.title | Surveying the X-ray Behavior of Novae as They Emit γ-rays | en_US |
| dc.type | Text | en_US |