Long-term and flares variability of fermi LAT FSRQ 4C+21.35
Joint Authors
Badran, H. M.
Hashad, Muhammad A.
Abduh, Yasir
Bunduq, Ibrahim Ibrahim Mustafa
Source
Arab Journal of Nuclear Sciences and Applications
Issue
Vol. 52, Issue 2 (30 Apr. 2019), pp.54-61, 8 p.
Publisher
The Egyptian Society of Nuclear Science and Applications
Publication Date
2019-04-30
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
The current study presents a long-term light curve (LC) of the flat spectrum radio quasar (FSRQ) 4C +21.35 (also known as PKS 1222+216, z=0.432) as observed by the Fermi Large Area Telescope (LAT) during the first seven years of the mission with weekly time binning in the energy range 0.2–50 GeV.
The highest weekly integral flux reached on MJD = 55365 (2010 June 18).
4C +21.35 exhibited during this period two major flares (flare I during MJD = 55296 – 55405 and flare II during MJD = 56961 - 56984).
For flare states, the variability of the source emission was studied with 12- hour time binning in two energy bands 0.2 – 0.8 GeV and 0.8 – 50 GeV.
Three different statistical methods, the structure functions (SF), auto-correlation functions (ACF), and fast Fourier transformer (FFT) were used to study the time scales.
For the seven year-weekly binning light curve, an 18-week time scale was observed.
Flare I seems to have the same time scales for both energy ranges.
Therefore, the outbursts during flare I may have come from the same emission mechanism/s; CCF between the two energy bands also emphasized it.
Flare II did not give significant results.
CCF illustrated a 6.5-day time lag that indicates the emission mechanism of the low energy band came before the high energy one with 6.5 day with a typical physical process.
American Psychological Association (APA)
Hashad, Muhammad A.& Abduh, Yasir& Bunduq, Ibrahim Ibrahim Mustafa& Badran, H. M.. 2019. Long-term and flares variability of fermi LAT FSRQ 4C+21.35. Arab Journal of Nuclear Sciences and Applications،Vol. 52, no. 2, pp.54-61.
https://search.emarefa.net/detail/BIM-891958
Modern Language Association (MLA)
Badran, H. M.…[et al.]. Long-term and flares variability of fermi LAT FSRQ 4C+21.35. Arab Journal of Nuclear Sciences and Applications Vol. 52, no. 2 (Apr. 2019), pp.54-61.
https://search.emarefa.net/detail/BIM-891958
American Medical Association (AMA)
Hashad, Muhammad A.& Abduh, Yasir& Bunduq, Ibrahim Ibrahim Mustafa& Badran, H. M.. Long-term and flares variability of fermi LAT FSRQ 4C+21.35. Arab Journal of Nuclear Sciences and Applications. 2019. Vol. 52, no. 2, pp.54-61.
https://search.emarefa.net/detail/BIM-891958
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 60-61
Record ID
BIM-891958