Evidence of the gamma-ray counterpart from nova FM Cir with Fermi-LAT

Q1 Earth and Planetary Sciences

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-04-12 DOI:10.1093/mnrasl/slae032

H. H. Wang, H. D. Yan, L.C.-C. Lin, J. Takata, P. Tam

{"title":"Evidence of the gamma-ray counterpart from nova FM Cir with Fermi-LAT","authors":"H. H. Wang, H. D. Yan, L.C.-C. Lin, J. Takata, P. Tam","doi":"10.1093/mnrasl/slae032","DOIUrl":null,"url":null,"abstract":"\n We report the analysis results of X-ray and γ-ray data of the nova FM Cir taken by Swift and Fermi-LAT. The γ-ray emission from FM Cir can be identified with a significance level of ∼ 3σ within ∼ 40 days after the nova eruption (2018 January 19) while we bin the light curve per day. The significance can further exceed 4σ confidence level if we accumulate longer time (i.e., 20 days) to bin the light curve. The γ-ray counterpart could be identified with a Test Statistic (TS) above 4 until ∼180 days after the eruption. The duration of the gamma-ray detection was longer than those reported in the previous studies of the other novae detected in the GeV range. The significant X-ray emission was observed after the gamma-ray flux level fell below the sensitivity of Fermi-LAT. The hardness ratio of the X-ray emission decreased rapidly with time, and the spectra were dominated by blackbody radiation from the hot white dwarf. Except for the longer duration of the γ-ray emission, the multi-wavelength properties of FM Cir closely resemble those of other novae detected in the GeV range.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"10 9","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Monthly Notices of the Royal Astronomical Society: Letters","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1093/mnrasl/slae032","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Earth and Planetary Sciences","Score":null,"Total":0}

引用次数: 0

Abstract

We report the analysis results of X-ray and γ-ray data of the nova FM Cir taken by Swift and Fermi-LAT. The γ-ray emission from FM Cir can be identified with a significance level of ∼ 3σ within ∼ 40 days after the nova eruption (2018 January 19) while we bin the light curve per day. The significance can further exceed 4σ confidence level if we accumulate longer time (i.e., 20 days) to bin the light curve. The γ-ray counterpart could be identified with a Test Statistic (TS) above 4 until ∼180 days after the eruption. The duration of the gamma-ray detection was longer than those reported in the previous studies of the other novae detected in the GeV range. The significant X-ray emission was observed after the gamma-ray flux level fell below the sensitivity of Fermi-LAT. The hardness ratio of the X-ray emission decreased rapidly with time, and the spectra were dominated by blackbody radiation from the hot white dwarf. Except for the longer duration of the γ-ray emission, the multi-wavelength properties of FM Cir closely resemble those of other novae detected in the GeV range.

查看原文本刊更多论文

用费米-激光雷达探测新星 FM Cir 的伽马射线对应物的证据

我们报告了由 Swift 和 Fermi-LAT 拍摄的新星 FM Cir 的 X 射线和 γ 射线数据的分析结果。在新星爆发（2018年1月19日）后的40天内，我们可以确定FM Cir的γ射线发射，显著性水平为3σ，而我们每天对光曲线进行分选。如果我们累积更长的时间（即20天）对光曲线进行分选，其显著性会进一步超过4σ置信水平。直到爆发后 180 天，γ 射线对应体的测试统计量（TS）才超过 4。伽马射线探测的持续时间比以前对其他新星在 GeV 范围内探测到的伽马射线的持续时间要长。在伽马射线通量水平低于费米-LAT的灵敏度之后，才观测到明显的X射线辐射。X 射线辐射的硬度比随着时间的推移而迅速降低，光谱主要是来自热白矮星的黑体辐射。除了γ射线发射持续时间较长之外，FM Cir 的多波长特性与在 GeV 范围内探测到的其他新星非常相似。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Monthly Notices of the Royal Astronomical Society: Letters Earth and Planetary Sciences-Space and Planetary Science

CiteScore

8.80

自引率

0.00%

发文量

136

期刊介绍： For papers that merit urgent publication, MNRAS Letters, the online section of Monthly Notices of the Royal Astronomical Society, publishes short, topical and significant research in all fields of astronomy. Letters should be self-contained and describe the results of an original study whose rapid publication might be expected to have a significant influence on the subsequent development of research in the associated subject area. The 5-page limit must be respected. Authors are required to state their reasons for seeking publication in the form of a Letter when submitting their manuscript.