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A multiwavelength study of the flat spectrum radio-quasar NVSS J141922-083830 covering four flaring episodesстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Buckley D.A.H, Britto R.J., Chandra S., Krushinsky V., Böttcher M., Razzaque S., Lipunov V., Stalin C.S., Gorbovskoy E., Tiurina N., Vlasenko D., Kniazev A.
- Журнал: Monthly Notices of the Royal Astronomical Society
- Том: 517
- Номер: 4
- Год издания: 2022
- Издательство: Oxford Journals, Oxford University Press
- Местоположение издательства: Oxford, UK, England
- Первая страница: 5791
- Последняя страница: 5804
- Номер статьи: stac2181
- DOI: 10.1093/mnras/stac2181
- Аннотация: We present multiwavelength observations and a model for flat spectrum radio quasar NVSS J141922-083830, originally classified as a blazar candidate of unknown type (BCU II object) in the Third Fermi-LAT AGN Catalog (3LAC). Relatively bright flares (>3 magnitudes) were observed on 21 February 2015 (MJD 57074) and 8 September 2018 (MJD 58369) in the optical band with the MASTER Global Robotic Net (MASTER-Net) telescopes. Optical spectra obtained with the Southern African Large Telescope (SALT) on 1 March 2015 (MJD 57082), during outburst, and on 30 May 2017 (MJD 57903), during quiescence, showed emission lines at 5325Å and at ≍3630Å that we identified as the Mg II 2798Å and C III] 1909Å lines, respectively, and hence derived a redshift z = 0.903. Analysis of Fermi-LAT data was performed in the quiescent regime (5 years of data) and during four prominent flaring states in February-April 2014, October-November 2014, February-March 2015 and September 2018. We present spectral and timing analysis with Fermi-LAT. We report a hardening of the gamma-ray spectrum during the last three flaring periods, with a power-law spectral index \ensuremathΓ = 2.0-2.1. The maximum gamma-ray flux level was observed on 24 October 2014 (MJD 56954) at (7.57 \ensuremath\pm 1.83) × 10$^-7$ ph cm$^-2$s$^-1$. The multi-wavelength spectral energy distribution during the February-March 2015 flare supports the earlier evidence of this blazar to belong to the FSRQ class. The SED can be well represented with a single-zone leptonic model with parameters typical of FSRQs, but also a hadronic origin of the high-energy emission can not be ruled out.
- Добавил в систему: Горбовской Евгений Сергеевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | 2022-MNRAS-Buckley-blazar_BNv5Ivs.pdf | 1,3 МБ | 23 ноября 2022 [lipunov] | |
| 2. | 2022-MNRAS-Buckley-blazar.pdf | 2022-MNRAS-Buckley-blazar.pdf | 1,3 МБ | 23 ноября 2022 [lipunov] |