Fermi Blazars in the Zwicky Transient Facility Survey: Properties of Large Optical Variations

arXiv - PHYS - High Energy Astrophysical Phenomena Pub Date : 2024-09-11 DOI:arxiv-2409.06917

Si-Si SunYunnan University, Zhongxiang WangYunnan University, Shun-hao JiYunnan University

{"title":"Fermi Blazars in the Zwicky Transient Facility Survey: Properties of Large Optical Variations","authors":"Si-Si SunYunnan University, Zhongxiang WangYunnan University, Shun-hao JiYunnan University","doi":"arxiv-2409.06917","DOIUrl":null,"url":null,"abstract":"We analyze the optical light-curve data, obtained with the Zwicky Transient\nFacility (ZTF) survey, for 47 gamma-ray blazars monitored by the Large Area\nTelescope onboard {\\it the Fermi Gamma-ray Space Telescope (Fermi)}. These 47\nsources are selected because they are among the Fermi blazars with the largest\noptical variations in the ZTF data. Two color-magnitude variation patterns are\nseen in them, one being redder to stable when brighter (RSWB; in 31 sources)\nand the other being stable when brighter (in 16 sources). The patterns fit with\nthe results recently reported in several similar studies with different data.\nMoreover, we find that the colors in the stable state of the sources share\nsimilar values, which (after corrected for the Galactic extinction) of most\nsources are in a range of 0.4--0.55. This feature could be intrinsic and may be\napplied in, for example, the study of intragalactic medium. We also determine\nthe turning points for the sources showing the RSWB pattern, after which the\ncolor changes saturate and become stable. We find a correlation between optical\nfluxes and gamma-ray fluxes at the turning points. The physical implications of\nthe correlation remain to be investigated, probably better with a sample of\nhigh-quality gamma-ray flux measurements.","PeriodicalId":501343,"journal":{"name":"arXiv - PHYS - High Energy Astrophysical Phenomena","volume":"6 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - High Energy Astrophysical Phenomena","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2409.06917","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

We analyze the optical light-curve data, obtained with the Zwicky Transient Facility (ZTF) survey, for 47 gamma-ray blazars monitored by the Large Area Telescope onboard {\it the Fermi Gamma-ray Space Telescope (Fermi)}. These 47 sources are selected because they are among the Fermi blazars with the largest optical variations in the ZTF data. Two color-magnitude variation patterns are seen in them, one being redder to stable when brighter (RSWB; in 31 sources) and the other being stable when brighter (in 16 sources). The patterns fit with the results recently reported in several similar studies with different data. Moreover, we find that the colors in the stable state of the sources share similar values, which (after corrected for the Galactic extinction) of most sources are in a range of 0.4--0.55. This feature could be intrinsic and may be applied in, for example, the study of intragalactic medium. We also determine the turning points for the sources showing the RSWB pattern, after which the color changes saturate and become stable. We find a correlation between optical fluxes and gamma-ray fluxes at the turning points. The physical implications of the correlation remain to be investigated, probably better with a sample of high-quality gamma-ray flux measurements.

查看原文本刊更多论文

兹威基瞬变设施巡天中的费米亮星：大光学变化的特性

我们分析了由费米伽马射线太空望远镜（Fermi）上的大面积望远镜（Large AreaTelescope onboard {\it the Fermi Gam-ray Space Telescope (Fermi)}）监测的47个伽马射线闪烁星的光学光曲线数据，这些数据是通过兹威基瞬变设施（Zwicky TransientFacility，ZTF）巡天获得的。之所以选择这47个源，是因为它们是ZTF数据中光学变化最大的费米闪星。在它们身上可以看到两种颜色-星等变化模式，一种是由红变亮到稳定（RSWB；31 个源中），另一种是由亮变稳定（16 个源中）。此外，我们还发现，稳定状态下的星源颜色具有相似的数值，大多数星源的数值（经银河消光校正后）在 0.4-0.55 之间。这一特征可能是固有的，可以应用于星系内介质的研究等。我们还确定了显示 RSWB 模式的星源的转折点，在这些转折点之后，颜色变化趋于饱和并趋于稳定。我们发现在转折点处光学通量和伽马射线通量之间存在着相关性。这种相关性的物理意义还有待研究，也许用高质量的伽马射线通量测量样本会更好。

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

arXiv - PHYS - High Energy Astrophysical Phenomena

自引率

0.00%

发文量