论文标题
扁平光谱射击QuaSar NVSS J141922-083830的多波长研究涵盖了四个耀斑
A multiwavelength study of the flat spectrum radio-quasar NVSS J141922-083830 covering four flaring episodes
论文作者
论文摘要
我们提出了多波长的观测值和扁平光谱无线电NVSS J141922-083830的模型，最初在第三fermi-lat AGN Catalog（3LAC）中被归类为未知类型（BCU II对象）的Blazar候选者（BCU II对象）。在2015年2月21日（MJD 57074）和2018年9月8日（MJD 58369）的光条上观察到相对明亮的耀斑（> 3个幅度），并带有主全球机器人网（Master-Net）望远镜。在爆发期间和2017年5月30日（MJD 57903）在2015年3月1日（MJD 57082）获得的南部非洲大型望远镜（SALT）（MJD 57903）在静止期间显示的光谱，在5325Å中显示排放线在5325Å处，并在$3630Å处确定为MG II 2798Å和Ciishifter and shifter and shillive and shifter and shifter and ash and。 z = 0.903。对费米 - 拉特数据的分析是在2014年2月至2014年2月至2014年2月至2014年2月至2014年2月至2015年2月至2015年2月至2018年10月至2018年9月至2018年9月的四个突出的耀斑状态下进行的。我们报告了在过去三个耀斑期间的伽马射线频谱的硬化，其中幂律频谱指数$γ= 2.0 $ - $ 2.1 $。 2014年10月24日（MJD 56954）$（7.57 \ pm 1.83）\ times 10^{ - 7} $ ph〜cm $^{ - 2} $ s $ s $^{ - 1} $。 2015年2月3月的耀斑期间的多波长光谱分布支持该Blazar属于FSRQ类的早期证据。 SED可以通过具有典型的FSRQ参数的单区Leptonic模型来很好地表示，但也不能排除高能发射的强度。
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 $\approx$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 $Γ= 2.0$-$2.1$. The maximum gamma-ray flux level was observed on 24 October 2014 (MJD 56954) at $(7.57 \pm 1.83) \times 10^{-7}$ 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.
