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Multi-wavelength observations of the BL Lac object Fermi J1544-0649: One year after its awakening

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dc.contributor.author Tam P.H.T.
dc.contributor.author Pal P.S.
dc.contributor.author Cui Y.D.
dc.contributor.author Jiang N.
dc.contributor.author Sotnikova Y.
dc.contributor.author Yang C.W.
dc.contributor.author Wang L.Z.
dc.contributor.author Tang B.T.
dc.contributor.author Li Y.B.
dc.contributor.author Mao J.
dc.contributor.author Kong A.K.H.
dc.contributor.author Zhong Z.H.
dc.contributor.author Ding J.
dc.contributor.author Mufakharov T.
dc.contributor.author Fan J.F.
dc.contributor.author Dou L.M.
dc.contributor.author Shen R.F.
dc.contributor.author Ai Y.L.
dc.date.accessioned 2021-02-25T21:01:04Z
dc.date.available 2021-02-25T21:01:04Z
dc.date.issued 2020
dc.identifier.issn 2214-4048
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/162881
dc.description.abstract © 2020 Elsevier B.V. We report observations of a transient source Fermi J1544-0649 from radio to γ-rays. Fermi J1544-0649 was discovered by the Fermi-LAT in May 2017. Follow-up Swift-XRT observations revealed three flaring episodes through March 2018, and the peak X-ray flux is about 103 higher than the ROSAT all-sky survey (RASS) flux upper limit. Optical spectral measurements taken by the Magellan 6.5-m telescope and the Lick-Shane telescope both show a largely featureless spectrum, strengthening the BL Lac interpretation first proposed by Bruni et al. (2018). The optical and mid-infrared (MIR) emission goes to a higher state in 2018, when the flux in high energies goes down to a lower level. Our RATAN-600 m measurements at 4.8 GHz and 8.2 GHz do not indicate any significant radio flux variation over the monitoring seasons in 2017 and 2018, nor deviate from the archival NVSS flux level. During GeV flaring times, the spectrum is very hard (Γγ∼1.7) in the GeV band and at times also very hard ((ΓX≲2) in the X-rays, similar to a high-synchrotron-peak (or even an extreme) BL Lac object, making Fermi J1544-0649 a good target for ground-based Cherenkov telescopes.
dc.relation.ispartofseries Journal of High Energy Astrophysics
dc.subject BL Lacertae objects
dc.subject Galaxies
dc.subject General
dc.subject Non-thermal
dc.subject Radiation mechanisms
dc.subject Surveys
dc.title Multi-wavelength observations of the BL Lac object Fermi J1544-0649: One year after its awakening
dc.type Article
dc.relation.ispartofseries-volume 26
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 45
dc.source.id SCOPUS22144048-2020-26-SID85080985056


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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