Ultraviolet Flux and Spectral Variability Study of Blazars Observed with UVIT/AstroSat
- Title
- Ultraviolet Flux and Spectral Variability Study of Blazars Observed with UVIT/AstroSat
- Creator
- Reshma M.; Agarwal A.; Stalin C.S.; Joseph P.; Dagore A.; Mandal A.K.; Devaraj A.; Gudennavar S.B.
- Description
- Blazars, the peculiar class of active galactic nuclei, are known to show flux variations across the accessible electromagnetic spectrum. Though they have been studied extensively for their flux variability characteristics across wavelengths, information on their ultraviolet (UV) flux variations on timescales of hours is very limited. Here, we present the first UV flux variability study on intraday timescales of a sample of ten blazars comprising two flat-spectrum radio quasars (FSRQs) and eight BL Lacertae objects (BL Lacs). These objects, spanning a redshift (z) range of 0.034 ? z ? 1.003, were observed in the far-UV (1300?1800 and near-UV (2000?3000 wavebands using the ultraviolet imaging telescope on board AstroSat. UV flux variations on timescales of hours were detected in nine sources out of the observed ten blazars. The spectral variability analysis showed a bluer-when-brighter trend with no difference in the UV spectral variability behavior between the studied sample of FSRQs and BL Lacs. The observed UV flux and spectral variability in our sample of both FSRQs and BL Lacs revealed that the observed UV emission in them is dominated by jet synchrotron process. 2024. The Author(s). Published by the American Astronomical Society.
- Source
- Astrophysical Journal, Vol-975, No. 1
- Date
- 2024-01-01
- Publisher
- Institute of Physics
- Coverage
- Reshma M., Department of Physics and Electronics, CHRIST University, Bangalore, 560 029, India; Agarwal A., Centre for Cosmology and Science Popularization, SGT University, Gurugram, 122 505, India; Stalin C.S., Indian Institute of Astrophysics, Block II, Koramangala, Bangalore, 560 034, India; Joseph P., Department of Physics and Electronics, CHRIST University, Bangalore, 560 029, India, Indian Institute of Astrophysics, Block II, Koramangala, Bangalore, 560 034, India; Dagore A., Indian Institute of Astrophysics, Block II, Koramangala, Bangalore, 560 034, India; Mandal A.K., Department of Physics & Astronomy, Seoul National University, Seoul, 08826, South Korea; Devaraj A., Department of Physics and Electronics, CHRIST University, Bangalore, 560 029, India; Gudennavar S.B., Department of Physics and Electronics, CHRIST University, Bangalore, 560 029, India
- Rights
- All Open Access; Gold Open Access; Green Open Access
- Relation
- ISSN: 0004637X
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Reshma M.; Agarwal A.; Stalin C.S.; Joseph P.; Dagore A.; Mandal A.K.; Devaraj A.; Gudennavar S.B., “Ultraviolet Flux and Spectral Variability Study of Blazars Observed with UVIT/AstroSat,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 26, 2025, https://archives.christuniversity.in/items/show/12698.