Optical flux and spectral characterization of the blazar PG 1553+113 based on the past 15 years of data
JOURNAL OF ASTROPHYSICS AND ASTRONOMY, cilt.43, sa.1, 2022 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 43 Sayı: 1
- Basım Tarihi: 2022
- Doi Numarası: 10.1007/s12036-021-09793-5
- Dergi Adı: JOURNAL OF ASTROPHYSICS AND ASTRONOMY
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
- Anahtar Kelimeler: Active galaxies, BL Lacertae objects, PG 1553+113, BLACK-HOLE BINARY, RELATIVISTIC JETS, LIGHT-CURVE, VARIABILITY, MICROVARIABILITY, POLARIZATION, INTRADAY, SEARCH, PERIODICITIES, PG-1553+11
- Atatürk Üniversitesi Adresli: Evet
Özet
We study flux and spectral variability of the high energy peaked TeV blazar PG 1553 + 113 on diverse timescales using the data collected from 2005 to 2019 which also includes the intensive intra-night monitoring of the target. Additionally, we recorded the brightest flare of the blazar PG 1553 + 113 during April 2019 when the source attained an R-band magnitude of 13.2. Analyzing the spectral evolution of the source during the flare gave a clockwise spectral hysteresis loop and a time lag with V-band variations leading to the R-band ones. Various statistical tests, fitting procedures and cross-correlation techniques are applied to search for periodicity and examine the color-magnitude relationship. We find a median period of (2.21 +/- 0.04) years along with the secondary period of about 210 days. Finally, we briefly discuss various physical mechanisms which are capable of explaining our findings.