X-ray Flux and Spectral Variability of the TeV Blazars Mrk 421 and PKS 2155-304
We reviewed X-ray flux and spectral variability properties studied to date by various X-ray satellites for Mrk 421 and PKS 2155-304, which are TeV emitting blazars. Mrk 421 and PKS 2155-304 are the most X-ray luminous blazars in the northern and southern hemispheres, respectively. Blazars show flux...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-09-01
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| Series: | Galaxies |
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| Online Access: | https://www.mdpi.com/2075-4434/8/3/64 |
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| author | Alok C. Gupta |
| author_facet | Alok C. Gupta |
| author_sort | Alok C. Gupta |
| collection | DOAJ |
| description | We reviewed X-ray flux and spectral variability properties studied to date by various X-ray satellites for Mrk 421 and PKS 2155-304, which are TeV emitting blazars. Mrk 421 and PKS 2155-304 are the most X-ray luminous blazars in the northern and southern hemispheres, respectively. Blazars show flux and spectral variabilities in the complete electromagnetic spectrum on diverse timescales ranging from a few minutes to hours, days, weeks, months and even several years. The flux and spectral variability on different timescales can be used to constrain the size of the emitting region, estimate the super massive black hole mass, find the dominant emission mechanism in the close vicinity of the super massive black hole, search for quasi-periodic oscillations in time series data and several other physical parameters of blazars. Flux and spectral variability is also a dominant tool to explain jet as well as disk emission from blazars at different epochs of observations. |
| first_indexed | 2024-03-10T16:33:38Z |
| format | Article |
| id | doaj.art-221e0735c43b47ff9b5d94ae53d1273b |
| institution | Directory Open Access Journal |
| issn | 2075-4434 |
| language | English |
| last_indexed | 2024-03-10T16:33:38Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Galaxies |
| spelling | doaj.art-221e0735c43b47ff9b5d94ae53d1273b2023-11-20T12:36:06ZengMDPI AGGalaxies2075-44342020-09-01836410.3390/galaxies8030064X-ray Flux and Spectral Variability of the TeV Blazars Mrk 421 and PKS 2155-304Alok C. Gupta0Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263001, IndiaWe reviewed X-ray flux and spectral variability properties studied to date by various X-ray satellites for Mrk 421 and PKS 2155-304, which are TeV emitting blazars. Mrk 421 and PKS 2155-304 are the most X-ray luminous blazars in the northern and southern hemispheres, respectively. Blazars show flux and spectral variabilities in the complete electromagnetic spectrum on diverse timescales ranging from a few minutes to hours, days, weeks, months and even several years. The flux and spectral variability on different timescales can be used to constrain the size of the emitting region, estimate the super massive black hole mass, find the dominant emission mechanism in the close vicinity of the super massive black hole, search for quasi-periodic oscillations in time series data and several other physical parameters of blazars. Flux and spectral variability is also a dominant tool to explain jet as well as disk emission from blazars at different epochs of observations.https://www.mdpi.com/2075-4434/8/3/64BL Lac objectsindividualMrk 421PKS 2155-304 galaxiesactive galaxiesjets radiation mechanisms |
| spellingShingle | Alok C. Gupta X-ray Flux and Spectral Variability of the TeV Blazars Mrk 421 and PKS 2155-304 Galaxies BL Lac objects individual Mrk 421 PKS 2155-304 galaxies active galaxies jets radiation mechanisms |
| title | X-ray Flux and Spectral Variability of the TeV Blazars Mrk 421 and PKS 2155-304 |
| title_full | X-ray Flux and Spectral Variability of the TeV Blazars Mrk 421 and PKS 2155-304 |
| title_fullStr | X-ray Flux and Spectral Variability of the TeV Blazars Mrk 421 and PKS 2155-304 |
| title_full_unstemmed | X-ray Flux and Spectral Variability of the TeV Blazars Mrk 421 and PKS 2155-304 |
| title_short | X-ray Flux and Spectral Variability of the TeV Blazars Mrk 421 and PKS 2155-304 |
| title_sort | x ray flux and spectral variability of the tev blazars mrk 421 and pks 2155 304 |
| topic | BL Lac objects individual Mrk 421 PKS 2155-304 galaxies active galaxies jets radiation mechanisms |
| url | https://www.mdpi.com/2075-4434/8/3/64 |
| work_keys_str_mv | AT alokcgupta xrayfluxandspectralvariabilityofthetevblazarsmrk421andpks2155304 |